MySQL恢复 – Database SOS

[MySQL异常恢复]mysql drop table 数据恢复

对于MySQL数据库的innodb引擎的数据库中,由于误操作删除表,或者由于sqldump自动生成语句含drop table create table语句导致数据丢失,在没有覆盖的情况下,可以实现完美恢复
创建测试表

mysql> CREATE TABLE recover.`t_drop` (
    ->   `messageId` varchar(30) NOT NULL,
    ->   `msgContent` varchar(1000) default NULL,
    ->   `scheduleDate` timestamp NOT NULL default CURRENT_TIMESTAMP on update CURRENT_TIMESTAMP,
    ->   `deliverState` int(1) default NULL,
    ->   PRIMARY KEY  (`messageId`)
    -> ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
Query OK, 0 rows affected (0.00 sec)
mysql> insert into recover.t_drop select messageId,msgContent,scheduleDate,deliverState from sms_send_record;
Query OK, 11 rows affected (0.00 sec)
Records: 11  Duplicates: 0  Warnings: 0
mysql> select * from recover.`t_drop`;
+--------------------+----------------------------------------------------------------------------------+---------------------+--------------+
| messageId          | msgContent                                                                       | scheduleDate        | deliverState |
+--------------------+----------------------------------------------------------------------------------+---------------------+--------------+
| 10235259536125650  | 尊敬的用户您好：您的手机验证码为474851如非本人操作，请拨打奥斯卡客服：400-620-757    | 2010-01-01 00:00:00 |            0 |
| 10235353811295807  | 尊敬的用户您好：您的手机验证码为444632如非本人操作，请拨打奥斯卡客服：400-620-757    | 2010-01-01 00:00:00 |            0 |
| 102354211240398235 | 尊敬的用户您好：您的手机验证码为478503如非本人操作，请拨打奥斯卡客服：400-620-757    | 2010-01-01 00:00:00 |            0 |
| 102354554052884567 | 尊敬的用户您好：您的手机验证码为216825如非本人操作，请拨打奥斯卡客服：400-620-757    | 2010-01-01 00:00:00 |            0 |
| 132213454294519126 | 尊敬的用户您好：您的手机验证码为854812如非本人操作，请拨打奥斯卡客服：400-620-757    | 2010-01-01 00:00:00 |            0 |
| 82329022242584577  | 尊敬的用户您好：您的手机验证码为253127如非本人操作，请拨打奥斯卡客服：400-620-757    | 2010-01-01 00:00:00 |            0 |
| 82329022242584581  | 尊敬的用户您好：您的手机验证码为253127如非本人操作，请拨打奥斯卡客服：400-620-757    | 2010-01-01 00:00:00 |            0 |
| 8233400415607376   | 尊敬的用户您好：您的手机验证码为338470如非本人操作，请拨打奥斯卡客服：400-620-757    | 2010-01-01 00:00:00 |            0 |
| 82334502212106951  | 尊敬的用户您好：您的手机验证码为916515如非本人操作，请拨打奥斯卡客服：400-620-757    | 2010-01-01 00:00:00 |            0 |
| 82339012756833423  | 尊敬的用户您好：您的手机验证码为396108如非本人操作，请拨打奥斯卡客服：400-620-757    | 2010-01-01 00:00:00 |            0 |
| 8234322198577796   | 尊敬的用户您好：您的手机验证码为935297如非本人操作，请拨打奥斯卡客服：400-620-757    | 2010-01-01 00:00:00 |            0 |
+--------------------+----------------------------------------------------------------------------------+---------------------+--------------+
11 rows in set (0.00 sec)
mysql> checksum table t_drop;
+-----------------+-----------+
| Table           | Checksum  |
+-----------------+-----------+
| recover.t_drop  | 920719058 |
+-----------------+-----------+
1 row in set (0.00 sec)

删除测试表,后续用来恢复

mysql> drop table recover.t_drop;
Query OK, 0 rows affected (0.00 sec)

解析ibdata文件

[root@web103 mysql_recovery]# ./stream_parser -f /var/lib/mysql/ibdata1
Opening file: /var/lib/mysql/ibdata1
File information:
ID of device containing file:         2049
inode number:                      1344553
protection:                         100660 (regular file)
number of hard links:                    1
user ID of owner:                       27
group ID of owner:                      27
device ID (if special file):             0
blocksize for filesystem I/O:         4096
number of blocks allocated:         463312
time of last access:            1440825416 Sat Aug 29 13:16:56 2015
time of last modification:      1440855835 Sat Aug 29 21:43:55 2015
time of last status change:     1440855835 Sat Aug 29 21:43:55 2015
total size, in bytes:            236978176 (226.000 MiB)
Size to process:                 236978176 (226.000 MiB)
Opening file: /var/lib/mysql/ibdata1
File information:
ID of device containing file:         2049
inode number:                      1344553
protection:                         100660 (regular file)
number of hard links:                    1
user ID of owner:                       27
group ID of owner:                      27
device ID (if special file):             0
blocksize for filesystem I/O:         4096
number of blocks allocated:         463312
time of last access:            1440825416 Sat Aug 29 13:16:56 2015
time of last modification:      1440855835 Sat Aug 29 21:43:55 2015
time of last status change:     1440855835 Sat Aug 29 21:43:55 2015
total size, in bytes:            236978176 (226.000 MiB)
Size to process:                 236978176 (226.000 MiB)
Opening file: /var/lib/mysql/ibdata1
File information:
ID of device containing file:         2049
inode number:                      1344553
protection:                         100660 (regular file)
number of hard links:                    1
user ID of owner:                       27
group ID of owner:                      27
device ID (if special file):             0
blocksize for filesystem I/O:         4096
number of blocks allocated:         463312
time of last access:            1440825416 Sat Aug 29 13:16:56 2015
time of last modification:      1440855835 Sat Aug 29 21:43:55 2015
time of last status change:     1440855835 Sat Aug 29 21:43:55 2015
total size, in bytes:            236978176 (226.000 MiB)
Size to process:                 236978176 (226.000 MiB)
Opening file: /var/lib/mysql/ibdata1
File information:
ID of device containing file:         2049
inode number:                      1344553
protection:                         100660 (regular file)
number of hard links:                    1
user ID of owner:                       27
group ID of owner:                      27
device ID (if special file):             0
blocksize for filesystem I/O:         4096
number of blocks allocated:         463312
time of last access:            1440825416 Sat Aug 29 13:16:56 2015
time of last modification:      1440855835 Sat Aug 29 21:43:55 2015
time of last status change:     1440855835 Sat Aug 29 21:43:55 2015
total size, in bytes:            236978176 (226.000 MiB)
Size to process:                 236978176 (226.000 MiB)
Opening file: /var/lib/mysql/ibdata1
File information:
ID of device containing file:         2049
inode number:                      1344553
protection:                         100660 (regular file)
number of hard links:                    1
user ID of owner:                       27
group ID of owner:                      27
device ID (if special file):             0
blocksize for filesystem I/O:         4096
number of blocks allocated:         463312
time of last access:            1440825416 Sat Aug 29 13:16:56 2015
time of last modification:      1440855835 Sat Aug 29 21:43:55 2015
time of last status change:     1440855835 Sat Aug 29 21:43:55 2015
total size, in bytes:            236978176 (226.000 MiB)
Size to process:                 236978176 (226.000 MiB)
Opening file: /var/lib/mysql/ibdata1
File information:
ID of device containing file:         2049
inode number:                      1344553
protection:                         100660 (regular file)
number of hard links:                    1
user ID of owner:                       27
group ID of owner:                      27
device ID (if special file):             0
blocksize for filesystem I/O:         4096
number of blocks allocated:         463312
time of last access:            1440825416 Sat Aug 29 13:16:56 2015
time of last modification:      1440855835 Sat Aug 29 21:43:55 2015
time of last status change:     1440855835 Sat Aug 29 21:43:55 2015
total size, in bytes:            236978176 (226.000 MiB)
Size to process:                 236978176 (226.000 MiB)
Opening file: /var/lib/mysql/ibdata1
File information:
ID of device containing file:         2049
inode number:                      1344553
protection:                         100660 (regular file)
number of hard links:                    1
user ID of owner:                       27
group ID of owner:                      27
device ID (if special file):             0
blocksize for filesystem I/O:         4096
number of blocks allocated:         463312
time of last access:            1440855928 Sat Aug 29 21:45:28 2015
time of last modification:      1440855835 Sat Aug 29 21:43:55 2015
time of last status change:     1440855835 Sat Aug 29 21:43:55 2015
total size, in bytes:            236978176 (226.000 MiB)
Size to process:                 236978176 (226.000 MiB)
Opening file: /var/lib/mysql/ibdata1
File information:
ID of device containing file:         2049
inode number:                      1344553
protection:                         100660 (regular file)
number of hard links:                    1
user ID of owner:                       27
group ID of owner:                      27
device ID (if special file):             0
blocksize for filesystem I/O:         4096
number of blocks allocated:         463312
time of last access:            1440855928 Sat Aug 29 21:45:28 2015
time of last modification:      1440855835 Sat Aug 29 21:43:55 2015
time of last status change:     1440855835 Sat Aug 29 21:43:55 2015
total size, in bytes:            236978176 (226.000 MiB)
Size to process:                 236978176 (226.000 MiB)
Worker(1): 56.64% done. 2015-08-29 21:45:30 ETA(in 00:00:01). Processing speed: 8.000 MiB/sec
Worker(0): 56.64% done. 2015-08-29 21:45:30 ETA(in 00:00:01). Processing speed: 8.000 MiB/sec
Worker(4): 56.64% done. 2015-08-29 21:45:30 ETA(in 00:00:01). Processing speed: 8.000 MiB/sec
Worker(3): 56.64% done. 2015-08-29 21:45:30 ETA(in 00:00:01). Processing speed: 8.000 MiB/sec
Worker(2): 56.64% done. 2015-08-29 21:45:30 ETA(in 00:00:01). Processing speed: 8.000 MiB/sec
Worker(7): 56.64% done. 2015-08-29 21:45:30 ETA(in 00:00:01). Processing speed: 8.000 MiB/sec
Worker(5): 56.64% done. 2015-08-29 21:45:30 ETA(in 00:00:01). Processing speed: 8.000 MiB/sec
Worker(6): 56.64% done. 2015-08-29 21:45:30 ETA(in 00:00:01). Processing speed: 8.000 MiB/sec
All workers finished in 1 sec

恢复mysql字典

[root@web103 mysql_recovery]# ./recover_dictionary.sh
Generating dictionary tables dumps... OK
Creating test database ... OK
Creating dictionary tables in database test:
SYS_TABLES ... OK
SYS_COLUMNS ... OK
SYS_INDEXES ... OK
SYS_FIELDS ... OK
All OK
Loading dictionary tables data:
SYS_TABLES ... 162 recs OK
SYS_COLUMNS ... 1247 recs OK
SYS_INDEXES ... 216 recs OK
SYS_FIELDS ... 411 recs OK
All OK
[root@web103 mysql_recovery]# mysql test
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 10162
Server version: 5.0.95 Source distribution
Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> select * from SYS_TABLES WHERE name like 'recover%';
+-------------------------+-----+--------+------+--------+---------+--------------+-------+
| NAME                    | ID  | N_COLS | TYPE | MIX_ID | MIX_LEN | CLUSTER_NAME | SPACE |
+-------------------------+-----+--------+------+--------+---------+--------------+-------+
| recover/#sql-64a9_1f6d  | 120 |      8 |    1 |      0 |       0 |              |     0 |
| recover/#sql2-64a9-1f6d | 115 |      8 |    1 |      0 |       0 |              |     0 |
| recover/t_delete        |  74 |      2 |    1 |      0 |       0 |              |     0 |
| recover/t_delete1       |  84 |      2 |    1 |      0 |       0 |              |     0 |
| recover/t_drop          | 125 |      4 |    1 |      0 |       0 |              |     0 |
| recover/t_truncate      | 120 |      8 |    1 |      0 |       0 |              |     0 |
| recover/t_xifenfei      |  75 |      2 |    1 |      0 |       0 |              |     0 |
| recover/zx_users        |  89 |     85 |    1 |      0 |       0 |              |     0 |
+-------------------------+-----+--------+------+--------+---------+--------------+-------+
8 rows in set (0.00 sec)
mysql> select * from SYS_INDEXES WHERE TABLE_ID=125;
+----------+-----+---------+----------+------+-------+------------+
| TABLE_ID | ID  | NAME    | N_FIELDS | TYPE | SPACE | PAGE_NO    |
+----------+-----+---------+----------+------+-------+------------+
|      125 | 142 | PRIMARY |        1 |    3 |     0 | 4294967295 |
+----------+-----+---------+----------+------+-------+------------+
1 row in set (0.00 sec)

恢复被删除表记录

[root@web103 mysql_recovery]# ./c_parser -5f pages-ibdata1/FIL_PAGE_INDEX/0000000000000142.page  -t dictionary/t_drop.sql >dumps/default/t_drop 2>2.sql
[root@web103 mysql_recovery]# more dumps/default/t_drop
-- Page id: 9860, Format: COMPACT, Records list: Valid, Expected records: (11 11)
00000099F9F2    80000026800110  t_drop  "10235259536125650"     "尊敬的用户您好：您的手机验证码为474851如非本人操作，请拨打奥斯卡客服：400-620-7575。"  "2010-01-01 00:00:00"   0
00000099F9F2    80000026800129  t_drop  "10235353811295807"     "尊敬的用户您好：您的手机验证码为444632如非本人操作，请拨打奥斯卡客服：400-620-7575。"  "2010-01-01 00:00:00"   0
00000099F9F2    80000026800142  t_drop  "102354211240398235"    "尊敬的用户您好：您的手机验证码为478503如非本人操作，请拨打奥斯卡客服：400-620-7575。"  "2010-01-01 00:00:00"   0
00000099F9F2    8000002680015C  t_drop  "102354554052884567"    "尊敬的用户您好：您的手机验证码为216825如非本人操作，请拨打奥斯卡客服：400-620-7575。"  "2010-01-01 00:00:00"   0
00000099F9F2    80000026800176  t_drop  "132213454294519126"    "尊敬的用户您好：您的手机验证码为854812如非本人操作，请拨打奥斯卡客服：400-620-7575。"  "2010-01-01 00:00:00"   0
00000099F9F2    80000026800190  t_drop  "82329022242584577"     "尊敬的用户您好：您的手机验证码为253127如非本人操作，请拨打奥斯卡客服：400-620-7575。"  "2010-01-01 00:00:00"   0
00000099F9F2    800000268001A9  t_drop  "82329022242584581"     "尊敬的用户您好：您的手机验证码为253127如非本人操作，请拨打奥斯卡客服：400-620-7575。"  "2010-01-01 00:00:00"   0
00000099F9F2    800000268001C2  t_drop  "8233400415607376"      "尊敬的用户您好：您的手机验证码为338470如非本人操作，请拨打奥斯卡客服：400-620-7575。"  "2010-01-01 00:00:00"   0
00000099F9F2    800000268001DA  t_drop  "82334502212106951"     "尊敬的用户您好：您的手机验证码为916515如非本人操作，请拨打奥斯卡客服：400-620-7575。"  "2010-01-01 00:00:00"   0
00000099F9F2    800000268001F3  t_drop  "82339012756833423"     "尊敬的用户您好：您的手机验证码为396108如非本人操作，请拨打奥斯卡客服：400-620-7575。"  "2010-01-01 00:00:00"   0
00000099F9F2    8000002680020C  t_drop  "8234322198577796"      "尊敬的用户您好：您的手机验证码为935297如非本人操作，请拨打奥斯卡客服：400-620-7575。"  "2010-01-01 00:00:00"   0
-- Page id: 9860, Found records: 11, Lost records: NO, Leaf page: YES

恢复数据入库

mysql> source dictionary/t_drop.sql
Query OK, 0 rows affected (0.00 sec)
mysql> source 2.sql
Query OK, 0 rows affected (0.00 sec)
Query OK, 11 rows affected (0.00 sec)
Records: 11  Deleted: 0  Skipped: 0  Warnings: 0
mysql> checksum table t_drop;
+-----------------+-----------+
| Table           | Checksum  |
+-----------------+-----------+
| recover.t_drop  | 920719058 |
+-----------------+-----------+
1 row in set (0.00 sec)

至此实现删除数据完美恢复

[MySQL异常恢复]mysql delete 数据恢复

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标题：[MySQL异常恢复]mysql delete 数据恢复

在mysql(innodb引擎)中,有些时候犹豫误操作导致表中数据被删除,从而导致不可挽回的损失,本文模拟在数据库被误delete的情况下,实现较为完美删除,当然在实际中可能有少量不覆盖或者无法恢复回来,但是在覆盖不多或者未覆盖的情况下,可以实现绝大多数甚至全部恢复.因此在发生误操作时候,应当第一时间保护现场,尽可能防止复写导致不可挽回的损失.在测试恢复过程中,由于mysql和操作系统编码问题,折腾了很久，感谢Lunar的指点
创建模拟表并插入数据

mysql> CREATE TABLE `sms_send_record_del` (
    ->   `messageId` varchar(30) NOT NULL,
    ->   `tokenId` varchar(20) NOT NULL,
    ->   `mobile` varchar(14) default NULL,
    ->   `msgFormat` int(1) NOT NULL,
    ->   `msgContent` varchar(1000) default NULL,
    ->   `scheduleDate` timestamp NOT NULL default CURRENT_TIMESTAMP on update CURRENT_TIMESTAMP,
    ->   `deliverState` int(1) default NULL,
    ->   `deliverdTime` timestamp NOT NULL default '0000-00-00 00:00:00',
    ->   PRIMARY KEY  (`messageId`)
    -> ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
Query OK, 0 rows affected (0.00 sec)
mysql> insert into sms_send_record_del select * from sms_send_record;
Query OK, 11 rows affected (0.00 sec)
Records: 11  Duplicates: 0  Warnings: 0
mysql> checksum table sms_send_record_del;
+---------------------------------+------------+
| Table                           | Checksum   |
+---------------------------------+------------+
| sms_service.sms_send_record_del | 2258631583 |
+---------------------------------+------------+
1 row in set (0.00 sec)
mysql> checksum table sms_send_record;
+-----------------------------+------------+
| Table                       | Checksum   |
+-----------------------------+------------+
| sms_service.sms_send_record | 2258631583 |
+-----------------------------+------------+
1 row in set (0.00 sec)

mysql-delete-recovery-1

确定innodb文件对应位置

mysql> SHOW VARIABLES LIKE 'datadir';
+---------------+-----------------+
| Variable_name | Value           |
+---------------+-----------------+
| datadir       | /var/lib/mysql/ |
+---------------+-----------------+
1 row in set (0.00 sec)
mysql> SHOW VARIABLES LIKE 'innodb_file_per_table';
+-----------------------+-------+
| Variable_name         | Value |
+-----------------------+-------+
| innodb_file_per_table | OFF   |
+-----------------------+-------+
1 row in set (0.00 sec)
mysql> SHOW VARIABLES LIKE 'innodb_data_file_path';
+-----------------------+------------------------+
| Variable_name         | Value                  |
+-----------------------+------------------------+
| innodb_data_file_path | ibdata1:10M:autoextend |
+-----------------------+------------------------+
1 row in set (0.00 sec)

删除表记录
模拟错误操作,误删除表所有数据

mysql> delete from sms_send_record_del;
Query OK, 11 rows affected (0.00 sec)

解析ibdata1文件

[root@web103 mysql_recovery]# ./stream_parser -f /var/lib/mysql/ibdata1
Opening file: /var/lib/mysql/ibdata1
File information:
ID of device containing file:         2049
inode number:                      1344553
protection:                         100660 (regular file)
number of hard links:                    1
user ID of owner:                       27
group ID of owner:                      27
device ID (if special file):             0
blocksize for filesystem I/O:         4096
number of blocks allocated:         315712
time of last access:            1440599559 Wed Aug 26 22:32:39 2015
time of last modification:      1440601853 Wed Aug 26 23:10:53 2015
time of last status change:     1440601853 Wed Aug 26 23:10:53 2015
total size, in bytes:            161480704 (154.000 MiB)
Size to process:                 161480704 (154.000 MiB)
Opening file: /var/lib/mysql/ibdata1
File information:
ID of device containing file:         2049
inode number:                      1344553
protection:                         100660 (regular file)
number of hard links:                    1
user ID of owner:                       27
group ID of owner:                      27
device ID (if special file):             0
blocksize for filesystem I/O:         4096
number of blocks allocated:         315712
time of last access:            1440599559 Wed Aug 26 22:32:39 2015
time of last modification:      1440601853 Wed Aug 26 23:10:53 2015
time of last status change:     1440601853 Wed Aug 26 23:10:53 2015
total size, in bytes:            161480704 (154.000 MiB)
Size to process:                 161480704 (154.000 MiB)
Opening file: /var/lib/mysql/ibdata1
File information:
ID of device containing file:         2049
inode number:                      1344553
protection:                         100660 (regular file)
number of hard links:                    1
user ID of owner:                       27
group ID of owner:                      27
device ID (if special file):             0
blocksize for filesystem I/O:         4096
number of blocks allocated:         315712
time of last access:            1440599559 Wed Aug 26 22:32:39 2015
time of last modification:      1440601853 Wed Aug 26 23:10:53 2015
time of last status change:     1440601853 Wed Aug 26 23:10:53 2015
total size, in bytes:            161480704 (154.000 MiB)
Size to process:                 161480704 (154.000 MiB)
Opening file: /var/lib/mysql/ibdata1
File information:
ID of device containing file:         2049
inode number:                      1344553
protection:                         100660 (regular file)
number of hard links:                    1
user ID of owner:                       27
group ID of owner:                      27
device ID (if special file):             0
blocksize for filesystem I/O:         4096
number of blocks allocated:         315712
time of last access:            1440599559 Wed Aug 26 22:32:39 2015
time of last modification:      1440601853 Wed Aug 26 23:10:53 2015
time of last status change:     1440601853 Wed Aug 26 23:10:53 2015
total size, in bytes:            161480704 (154.000 MiB)
Size to process:                 161480704 (154.000 MiB)
Opening file: /var/lib/mysql/ibdata1
File information:
ID of device containing file:         2049
inode number:                      1344553
protection:                         100660 (regular file)
number of hard links:                    1
user ID of owner:                       27
group ID of owner:                      27
device ID (if special file):             0
blocksize for filesystem I/O:         4096
number of blocks allocated:         315712
Opening file: /var/lib/mysql/ibdata1
time of last access:            1440599559 Wed Aug 26 22:32:39 2015
time of last modification:      1440601853 Wed Aug 26 23:10:53 2015
time of last status change:     1440601853 Wed Aug 26 23:10:53 2015
File information:
total size, in bytes:            161480704 (154.000 MiB)
ID of device containing file:         2049
Size to process:                 161480704 (154.000 MiB)
Opening file: /var/lib/mysql/ibdata1
File information:
ID of device containing file:         2049
inode number:                      1344553
protection:                         100660 (regular file)
number of hard links:                    1
user ID of owner:                       27
group ID of owner:                      27
device ID (if special file):             0
blocksize for filesystem I/O:         4096
number of blocks allocated:         315712
time of last access:            1440599559 Wed Aug 26 22:32:39 2015
time of last modification:      1440601853 Wed Aug 26 23:10:53 2015
time of last status change:     1440601853 Wed Aug 26 23:10:53 2015
total size, in bytes:            161480704 (154.000 MiB)
Size to process:                 161480704 (154.000 MiB)
Opening file: /var/lib/mysql/ibdata1
inode number:                      1344553
protection:                         100660 (regular file)
number of hard links:                    1
user ID of owner:                       27
group ID of owner:                      27
device ID (if special file):             0
File information:
blocksize for filesystem I/O:         4096
number of blocks allocated:         315712
ID of device containing file:         2049
inode number:                      1344553
protection:                         100660 (regular file)
number of hard links:                    1
user ID of owner:                       27
group ID of owner:                      27
device ID (if special file):             0
blocksize for filesystem I/O:         4096
number of blocks allocated:         315712
time of last access:            1440599559 Wed Aug 26 22:32:39 2015
time of last modification:      1440601853 Wed Aug 26 23:10:53 2015
time of last status change:     1440601853 Wed Aug 26 23:10:53 2015
total size, in bytes:            161480704 (154.000 MiB)
Size to process:                 161480704 (154.000 MiB)
time of last access:            1440601884 Wed Aug 26 23:11:24 2015
time of last modification:      1440601853 Wed Aug 26 23:10:53 2015
time of last status change:     1440601853 Wed Aug 26 23:10:53 2015
total size, in bytes:            161480704 (154.000 MiB)
Size to process:                 161480704 (154.000 MiB)
All workers finished in 0 sec

分析数据字典

mysql> show tables
    -> ;
+----------------+
| Tables_in_test |
+----------------+
| SYS_COLUMNS    |
| SYS_FIELDS     |
| SYS_INDEXES    |
| SYS_TABLES     |
+----------------+
4 rows in set (0.00 sec)
mysql> select * from SYS_TABLES;
+----------------------------------------+----+-------------+------+--------+---------+--------------+-------+
| NAME                                   | ID | N_COLS      | TYPE | MIX_ID | MIX_LEN | CLUSTER_NAME | SPACE |
+----------------------------------------+----+-------------+------+--------+---------+--------------+-------+
| recover/t_delete                       | 74 |           2 |    1 |      0 |       0 |              |     0 |
| recover/t_delete1                      | 84 |           2 |    1 |      0 |       0 |              |     0 |
| recover/t_xifenfei                     | 75 |           2 |    1 |      0 |       0 |              |     0 |
| recover/zx_users                       | 89 |          85 |    1 |      0 |       0 |              |     0 |
| sms_service/sms_send_record            | 36 |           8 |    1 |      0 |       0 |              |     0 |
| sms_service/sms_send_record_del        | 90 |           8 |    1 |      0 |       0 |              |     0 |
| SYS_FOREIGN                            | 11 | -2147483644 |    1 |      0 |       0 |              |     0 |
| SYS_FOREIGN_COLS                       | 12 | -2147483644 |    1 |      0 |       0 |              |     0 |
| test/SYS_COLUMNS                       | 86 |           7 |    1 |      0 |       0 |              |     0 |
| test/SYS_FIELDS                        | 88 |           3 |    1 |      0 |       0 |              |     0 |
| test/SYS_INDEXES                       | 87 |           7 |    1 |      0 |       0 |              |     0 |
| test/SYS_TABLES                        | 85 |           8 |    1 |      0 |       0 |              |     0 |
| test/zx_users                          | 43 |          85 |    1 |      0 |       0 |              |     0 |
| xifenfei/t_delete                      | 44 |           8 |    1 |      0 |       0 |              |     0 |
| xifenfei/t_xifenfei                    | 59 |           2 |    1 |      0 |       0 |              |     0 |
+----------------------------------------+----+-------------+------+--------+---------+--------------+-------+
39 rows in set (0.00 sec)
mysql> select * from SYS_INDEXES WHERE TABLE_ID=90;
+----------+-----+---------+----------+------+-------+---------+
| TABLE_ID | ID  | NAME    | N_FIELDS | TYPE | SPACE | PAGE_NO |
+----------+-----+---------+----------+------+-------+---------+
|       90 | 110 | PRIMARY |        1 |    3 |     0 |    2955 |
+----------+-----+---------+----------+------+-------+---------+
1 row in set (0.00 sec)

找回被删除记录

[root@web103 mysql_recovery]# ./c_parser -5Df pages-ibdata1/FIL_PAGE_INDEX/0000000000000110.page \
[root@web103 mysql_recovery]#    -t dictionary/sms_send_record_del.sql >/tmp/t_1.txt 2>/tmp/t_1.sql

mysql-delete-recovery-2

加载数据并验证

mysql> use sms_service;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> source /tmp/t_1.sql
Query OK, 0 rows affected (0.00 sec)
Query OK, 11 rows affected, 8 warnings (0.01 sec)
Records: 11  Deleted: 0  Skipped: 0  Warnings: 8
mysql> checksum table sms_send_record_del;
+---------------------------------+------------+
| Table                           | Checksum   |
+---------------------------------+------------+
| sms_service.sms_send_record_del | 2258631583 |
+---------------------------------+------------+
1 row in set (0.00 sec)

发生误操作之时,请尽可能保护现场,防止覆盖导致无可挽回的损失.

[MySQL异常恢复]恢复数据字典表讲解

联系：手机/微信(+86 17813235971) QQ(107644445)

标题：[MySQL异常恢复]恢复数据字典表讲解

在以前的文章中说过mysql的数据字典的恢复(使用工具直接抽取MySQL数据字典,缺少SYS_FIELDS表),主要的数据字典有一下几个，在本文中主要对这些数据字典的意义进行一些讲解，为大家更深一步了解mysql恢复处理思路
MySQL恢复字典表

mysql> show tables;
+----------------+
| Tables_in_test |
+----------------+
| SYS_COLUMNS    |
| SYS_FIELDS     |
| SYS_INDEXES    |
| SYS_TABLES     |
+----------------+
4 rows in set (0.00 sec)

SYS_TABLES
这个表是mysql恢复的最核心的表之一，主要是记录数据库在InnoDB中表的信息。它默认写在InnoDB的index_ids为1的里面，它的根页在8号page上，他的主要列结构为：

mysql> desc SYS_TABLES;
+--------------+---------------------+------+-----+---------+-------+
| Field        | Type                | Null | Key | Default | Extra |
+--------------+---------------------+------+-----+---------+-------+
| NAME         | varchar(255)        | NO   | PRI |         |       |
| ID           | bigint(20) unsigned | NO   |     | 0       |       |
| N_COLS       | int(10)             | YES  |     | NULL    |       |
| TYPE         | int(10) unsigned    | YES  |     | NULL    |       |
| MIX_ID       | bigint(20) unsigned | YES  |     | NULL    |       |
| MIX_LEN      | int(10) unsigned    | YES  |     | NULL    |       |
| CLUSTER_NAME | varchar(255)        | YES  |     | NULL    |       |
| SPACE        | int(10) unsigned    | YES  |     | NULL    |       |
+--------------+---------------------+------+-----+---------+-------+
8 rows in set (0.00 sec)

NAME:顾名思义,就是表的名字,但是注意他记录的格式是db/table,例如:xifenfei/zx_users,表示为xifenfei数据库中的zx_users表
ID:表的编号
N_COLS:表一共包含的列的数量
TYPE, MIX_ID, MIX_LEN 和 CLUSTER_NAME列,对于数据库恢复无任何意义不做描述
SPACE:表空间的标示列. 例如： ibdata1 是 SPACE 0, ibdata2 是 SPACE 1, 每一个 ibd 文件都有自己的表空间标示.

SYS_INDEXES
这个也是mysql恢复的最核心表之一,主要是记录InnoDB的index信息,它默认InnoDB的index_ids为3的里面，他的主要结构为：

mysql> desc SYS_INDEXES;
+----------+---------------------+------+-----+---------+-------+
| Field    | Type                | Null | Key | Default | Extra |
+----------+---------------------+------+-----+---------+-------+
| TABLE_ID | bigint(20) unsigned | NO   | PRI | 0       |       |
| ID       | bigint(20) unsigned | NO   | PRI | 0       |       |
| NAME     | varchar(120)        | YES  |     | NULL    |       |
| N_FIELDS | int(10) unsigned    | YES  |     | NULL    |       |
| TYPE     | int(10) unsigned    | YES  |     | NULL    |       |
| SPACE    | int(10) unsigned    | YES  |     | NULL    |       |
| PAGE_NO  | int(10) unsigned    | YES  |     | NULL    |       |
+----------+---------------------+------+-----+---------+-------+
7 rows in set (0.00 sec)

TABLE_ID:表标示列,为SYS_TABLES.ID
ID:为InnoDB中的index的编号,这个在恢复中非常重要,恢复之时需要根据这个去定位具体的文件
NAME:主要表的index的名字,有PRIMARY 和普通列的index信息,一般恢复之时我们选择PRIMARY
N_FIELDS:表名index包含列的数量,在mysql恢复中不重要
TYPE:恢复之中使用不到该列,不做说明
PAGE:用途等同SYS_TABLES.SPACE
PAGE_NO:标示为每个index的root page的page号,关于index中的page结构如下图所示
Bplustree

SYS_COLUMNS
这个表主要记录数据库中表的列的情况,它存储在index_id 2中.主要用它来确定需要恢复表的列的情况,如果你知道完全的列结构,该表不是MySQL恢复所必须的,它的主要结构为：

mysql> desc SYS_COLUMNS;
+----------+---------------------+------+-----+---------+-------+
| Field    | Type                | Null | Key | Default | Extra |
+----------+---------------------+------+-----+---------+-------+
| TABLE_ID | bigint(20) unsigned | NO   | PRI | NULL    |       |
| POS      | int(10) unsigned    | NO   | PRI | NULL    |       |
| NAME     | varchar(255)        | YES  |     | NULL    |       |
| MTYPE    | int(10) unsigned    | YES  |     | NULL    |       |
| PRTYPE   | int(10) unsigned    | YES  |     | NULL    |       |
| LEN      | int(10) unsigned    | YES  |     | NULL    |       |
| PREC     | int(10) unsigned    | YES  |     | NULL    |       |
+----------+---------------------+------+-----+---------+-------+
7 rows in set (0.00 sec)

TABLE_ID:表标示列,为SYS_TABLES.ID
POS:该列所在表中的位置,该值从0开始
NAME:列的名字
MTYPE 和 PRTYPE:主要是为了记录列的类型,出现此类问题主要是由于InnoDB最初并不是为MySQL而设计,到了后面为更好支持MySQL,因此出现了两种情况.
LEN:列的长度.这个需要注意编码,比如数据库是utf8编码,定义的varchar(10),实际该处长度显示为30,因为每个除英文外的字符编码为3个byte.
PREC:有些特殊类型中,列的精确度定义

SYS_FIELDS
记录所有index的列的分布信息,它存储在index_id 4中,该表不是MySQL恢复所必须的,它的主要结构为:

mysql> desc SYS_FIELDS;
+----------+---------------------+------+-----+---------+-------+
| Field    | Type                | Null | Key | Default | Extra |
+----------+---------------------+------+-----+---------+-------+
| INDEX_ID | bigint(20) unsigned | NO   | PRI | NULL    |       |
| POS      | int(10) unsigned    | NO   | PRI | NULL    |       |
| COL_NAME | varchar(255)        | YES  |     | NULL    |       |
+----------+---------------------+------+-----+---------+-------+
3 rows in set (0.00 sec)

INDEX_ID:index的标志,等同SYS_INDEXES.ID
POS:列在index中的位置,从0开始
COL_NAME:列的名称
通过上述相关表和列,然后结合MySQL相关恢复工具,就可以从底层在InnoDB出现问题,或者误操作之时提供恢复处理.

MySQL drop database恢复(恢复方法同样适用MySQL drop table,delete,truncate table)

联系：手机/微信(+86 17813235971) QQ(107644445)

标题：MySQL drop database恢复(恢复方法同样适用MySQL drop table,delete,truncate table)

昨天晚上接到一个网络服务请求，由于不小心点击了自己产品软件上面的清空数据功能(这个工具确实需要小心,在Oracle恢复案例中,也有xx企业erp该功能导致数据被删除请求恢复)，导致MySQL数据库被直接drop database掉了，之前没有做任何备份，只是发生故障之后，他们立即封存现场，备份出来了ibdata1文件。接到请求之后，通过让其把ibdata1文件发给过来，通过MySQL recovery工具进行分析恢复，经过6个小时的处理，基本上实现核心数据0丢失.
解析ibdata1(innodb文件)

[root@localhost recovery_MySQL]# ./stream_parser -f /tmp/ibdata1
Opening file: /tmp/ibdata1
File information:
ID of device containing file:         2055
inode number:                        97257
protection:                         100644 (regular file)
number of hard links:                    1
user ID of owner:                        0
group ID of owner:                       0
device ID (if special file):             0
blocksize for filesystem I/O:         4096
number of blocks allocated:          36920
Opening file: /tmp/ibdata1
time of last access:            1440083236 Thu Aug 20 23:07:16 2015
File information:
time of last modification:      1440062236 Thu Aug 20 17:17:16 2015
time of last status change:     1440081904 Thu Aug 20 22:45:04 2015
ID of device containing file:         2055
inode number:                        97257
protection:                         100644 total size, in bytes:             18874368 (18.000 MiB)
(regular file)
number of hard links:                    1
user ID of owner:                        0
group ID of owner:                       0
device ID (if special file):             0
blocksize for filesystem I/O:         4096
number of blocks allocated:          36920
Size to process:                  18874368 (18.000 MiB)
Opening file: /tmp/ibdata1
File information:
ID of device containing file:         2055
inode number:                        97257
protection:                         100644 (regular file)
number of hard links:                    1
user ID of owner:                        0
group ID of owner:                       0
device ID (if special file):             0
blocksize for filesystem I/O:         4096
number of blocks allocated:          36920
time of last access:            1440083236 Thu Aug 20 23:07:16 2015
time of last modification:      1440062236 Thu Aug 20 17:17:16 2015
time of last status change:     1440081904 Thu Aug 20 22:45:04 2015
total size, in bytes:             18874368 (18.000 MiB)
Opening file: /tmp/ibdata1
File information:
Size to process:                  18874368 (18.000 MiB)
ID of device containing file:         2055
inode number:                        97257
protection:                         100644 (regular file)
time of last access:            1440083236 Thu Aug 20 23:07:16 2015
number of hard links:                    1
user ID of owner:                        0
time of last modification:      1440062236 Thu Aug 20 17:17:16 2015
group ID of owner:                       0
time of last status change:     1440081904 Thu Aug 20 22:45:04 2015
device ID (if special file):             0
blocksize for filesystem I/O:         4096
number of blocks allocated:          36920
total size, in bytes:             18874368 (18.000 MiB)
Size to process:                  18874368 (18.000 MiB)
Opening file: /tmp/ibdata1
File information:
ID of device containing file:         2055
inode number:                        97257
protection:                         100644 (regular file)
number of hard links:                    1
user ID of owner:                        0
time of last access:            1440083236 Thu Aug 20 23:07:16 2015
group ID of owner:                       0
device ID (if special file):             0
time of last modification:      1440062236 Thu Aug 20 17:17:16 2015
blocksize for filesystem I/O:         4096
time of last status change:     1440081904 Thu Aug 20 22:45:04 2015
number of blocks allocated:          36920
Opening file: /tmp/ibdata1
total size, in bytes:             18874368 (18.000 MiB)
File information:
Size to process:                  18874368 (18.000 MiB)
ID of device containing file:         2055
inode number:                        97257
protection:                         100644 (regular file)
number of hard links:                    1
user ID of owner:                        0
group ID of owner:                       0
device ID (if special file):             0
time of last access:            1440083236 Thu Aug 20 23:07:16 2015
blocksize for filesystem I/O:         4096
time of last modification:      1440062236 Thu Aug 20 17:17:16 2015
number of blocks allocated:          36920
time of last status change:     1440081904 Thu Aug 20 22:45:04 2015
Opening file: /tmp/ibdata1
total size, in bytes:             18874368 (18.000 MiB)
File information:
Size to process:                  18874368 (18.000 MiB)
ID of device containing file:         2055
inode number:                        97257
protection:                         100644 (regular file)
number of hard links:                    1
user ID of owner:                        0
group ID of owner:                       0
device ID (if special file):             0
blocksize for filesystem I/O:         4096
number of blocks allocated:          36920
time of last access:            1440083236 Thu Aug 20 23:07:16 2015
time of last modification:      1440062236 Thu Aug 20 17:17:16 2015
time of last status change:     1440081904 Thu Aug 20 22:45:04 2015
Opening file: /tmp/ibdata1
File information:
total size, in bytes:             18874368 (18.000 MiB)
ID of device containing file:         2055
inode number:                        97257
protection:                         100644 Size to process:                  18874368 (18.000 MiB)
(regular file)
number of hard links:                    1
time of last access:            1440083236 Thu Aug 20 23:07:16 2015
user ID of owner:                        0
group ID of owner:                       0
time of last modification:      1440062236 Thu Aug 20 17:17:16 2015
Opening file: /tmp/ibdata1
time of last status change:     1440081904 Thu Aug 20 22:45:04 2015
device ID (if special file):             0
File information:
blocksize for filesystem I/O:         4096
number of blocks allocated:          36920
total size, in bytes:             18874368 (18.000 MiB)
ID of device containing file:         2055
inode number:                        97257
protection:                         100644 (regular file)
Size to process:                  18874368 (18.000 MiB)
number of hard links:                    1
user ID of owner:                        0
group ID of owner:                       0
device ID (if special file):             0
blocksize for filesystem I/O:         4096
number of blocks allocated:          36920
time of last access:            1440083236 Thu Aug 20 23:07:16 2015
Opening file: /tmp/ibdata1
time of last modification:      1440062236 Thu Aug 20 17:17:16 2015
File information:
time of last status change:     1440081904 Thu Aug 20 22:45:04 2015
ID of device containing file:         2055
total size, in bytes:             18874368 (18.000 MiB)
inode number:                        97257
protection:                         100644 (regular file)
number of hard links:                    1
user ID of owner:                        0
Size to process:                  18874368 (18.000 MiB)
group ID of owner:                       0
time of last access:            1440083236 Thu Aug 20 23:07:16 2015
device ID (if special file):             0
blocksize for filesystem I/O:         4096
time of last modification:      1440062236 Thu Aug 20 17:17:16 2015
number of blocks allocated:          36920
time of last status change:     1440081904 Thu Aug 20 22:45:04 2015
total size, in bytes:             18874368 (18.000 MiB)
Opening file: /tmp/ibdata1
Size to process:                  18874368 (18.000 MiB)
File information:
ID of device containing file:         2055
inode number:                        97257
protection:                         100644 (regular file)
number of hard links:                    1
time of last access:            1440083236 Thu Aug 20 23:07:16 2015
user ID of owner:                        0
group ID of owner:                       0
time of last modification:      1440062236 Thu Aug 20 17:17:16 2015
device ID (if special file):             0
time of last status change:     1440081904 Thu Aug 20 22:45:04 2015
blocksize for filesystem I/O:         4096
number of blocks allocated:          36920
total size, in bytes:             18874368 (18.000 MiB)
Size to process:                  18874368 (18.000 MiB)
Opening file: /tmp/ibdata1
File information:
ID of device containing file:         2055
inode number:                        97257
protection:                         100644 (regular file)
number of hard links:                    1
user ID of owner:                        0
group ID of owner:                       0
time of last access:            1440083236 Thu Aug 20 23:07:16 2015
device ID (if special file):             0
time of last modification:      1440062236 Thu Aug 20 17:17:16 2015
blocksize for filesystem I/O:         4096
time of last status change:     1440081904 Thu Aug 20 22:45:04 2015
number of blocks allocated:          36920
total size, in bytes:             18874368 (18.000 MiB)
Opening file: /tmp/ibdata1
File information:
Size to process:                  18874368 (18.000 MiB)
ID of device containing file:         2055
inode number:                        97257
protection:                         100644 (regular file)
number of hard links:                    1
user ID of owner:                        0
group ID of owner:                       0
device ID (if special file):             0
blocksize for filesystem I/O:         4096
number of blocks allocated:          36920
time of last access:            1440083236 Thu Aug 20 23:07:16 2015
time of last modification:      1440062236 Thu Aug 20 17:17:16 2015
time of last status change:     1440081904 Thu Aug 20 22:45:04 2015
total size, in bytes:             18874368 (18.000 MiB)
Opening file: /tmp/ibdata1
File information:
Size to process:                  18874368 (18.000 MiB)
ID of device containing file:         2055
inode number:                        97257
time of last access:            1440083236 Thu Aug 20 23:07:16 2015
protection:                         100644 (regular file)
time of last modification:      1440062236 Thu Aug 20 17:17:16 2015
number of hard links:                    1
time of last status change:     1440081904 Thu Aug 20 22:45:04 2015
user ID of owner:                        0
group ID of owner:                       0
device ID (if special file):             0
blocksize for filesystem I/O:         4096
total size, in bytes:             18874368 (18.000 MiB)
number of blocks allocated:          36920
Size to process:                  18874368 (18.000 MiB)
time of last access:            1440083236 Thu Aug 20 23:07:16 2015
time of last modification:      1440062236 Thu Aug 20 17:17:16 2015
time of last status change:     1440081904 Thu Aug 20 22:45:04 2015
total size, in bytes:             18874368 (18.000 MiB)
Size to process:                  18874368 (18.000 MiB)
Opening file: /tmp/ibdata1
File information:
ID of device containing file:         2055
inode number:                        97257
protection:                         100644 (regular file)
number of hard links:                    1
user ID of owner:                        0
group ID of owner:                       0
device ID (if special file):             0
blocksize for filesystem I/O:         4096
number of blocks allocated:          36920
time of last access:            1440083236 Thu Aug 20 23:07:16 2015
time of last modification:      1440062236 Thu Aug 20 17:17:16 2015
time of last status change:     1440081904 Thu Aug 20 22:45:04 2015
total size, in bytes:             18874368 (18.000 MiB)
Size to process:                  18874368 (18.000 MiB)
Opening file: /tmp/ibdata1
File information:
ID of device containing file:         2055
inode number:                        97257
protection:                         100644 (regular file)
number of hard links:                    1
user ID of owner:                        0
group ID of owner:                       0
device ID (if special file):             0
blocksize for filesystem I/O:         4096
number of blocks allocated:          36920
time of last access:            1440083236 Thu Aug 20 23:07:16 2015
time of last modification:      1440062236 Thu Aug 20 17:17:16 2015
time of last status change:     1440081904 Thu Aug 20 22:45:04 2015
total size, in bytes:             18874368 (18.000 MiB)
Size to process:                  18874368 (18.000 MiB)
All workers finished in 0 sec
[root@localhost recovery_MySQL]# cd pages-ibdata1
[root@localhost pages-ibdata1]# ls -l
total 16
drwxr-xr-x 2 root root 4096 Aug 20 22:53 FIL_PAGE_INDEX
drwxr-xr-x 2 root root 4096 Aug 20 22:53 FIL_PAGE_TYPE_BLOB
[root@localhost pages-ibdata1]# cd FIL_PAGE_INDEX
[root@localhost FIL_PAGE_INDEX]# ls -l
total 9924
-rw-r--r-- 1 root root   32768 Aug 20 22:53 0000000000000001.page
-rw-r--r-- 1 root root  278528 Aug 20 22:53 0000000000000002.page
-rw-r--r-- 1 root root   32768 Aug 20 22:53 0000000000000003.page
-rw-r--r-- 1 root root   32768 Aug 20 22:53 0000000000000004.page
-rw-r--r-- 1 root root   32768 Aug 20 22:53 0000000000000005.page
-rw-r--r-- 1 root root   16384 Aug 20 22:53 0000000000000011.page
-rw-r--r-- 1 root root   16384 Aug 20 22:53 0000000000000012.page
-rw-r--r-- 1 root root   16384 Aug 20 22:53 0000000000000013.page
-rw-r--r-- 1 root root   16384 Aug 20 22:53 0000000000000014.page
-rw-r--r-- 1 root root 2883584 Aug 20 22:53 0000000000000065.page
-rw-r--r-- 1 root root  475136 Aug 20 22:53 0000000000000066.page
-rw-r--r-- 1 root root  737280 Aug 20 22:53 0000000000000067.page
-rw-r--r-- 1 root root   49152 Aug 20 22:53 0000000000000068.page
-rw-r--r-- 1 root root   16384 Aug 20 22:53 0000000000000069.page
-rw-r--r-- 1 root root   16384 Aug 20 22:53 0000000000000070.page
-rw-r--r-- 1 root root   16384 Aug 20 22:53 0000000000000071.page
-rw-r--r-- 1 root root   16384 Aug 20 22:53 0000000000000072.page
-rw-r--r-- 1 root root   16384 Aug 20 22:53 0000000000000073.page
-rw-r--r-- 1 root root   16384 Aug 20 22:53 0000000000000074.page
-rw-r--r-- 1 root root   16384 Aug 20 22:53 0000000000000075.page
-rw-r--r-- 1 root root   16384 Aug 20 22:53 0000000000000076.page
-rw-r--r-- 1 root root   16384 Aug 20 22:53 0000000000000077.page
-rw-r--r-- 1 root root   49152 Aug 20 22:53 0000000000000078.page
-rw-r--r-- 1 root root   49152 Aug 20 22:53 0000000000000079.page
-rw-r--r-- 1 root root   49152 Aug 20 22:53 0000000000000080.page
-rw-r--r-- 1 root root   49152 Aug 20 22:53 0000000000000081.page
-rw-r--r-- 1 root root   49152 Aug 20 22:53 0000000000000082.page
-rw-r--r-- 1 root root   49152 Aug 20 22:53 0000000000000083.page
-rw-r--r-- 1 root root   49152 Aug 20 22:53 0000000000000084.page
-rw-r--r-- 1 root root  753664 Aug 20 22:53 0000000000000085.page
-rw-r--r-- 1 root root   49152 Aug 20 22:53 0000000000000086.page
-rw-r--r-- 1 root root   49152 Aug 20 22:53 0000000000000087.page
-rw-r--r-- 1 root root   49152 Aug 20 22:53 0000000000000088.page
-rw-r--r-- 1 root root   49152 Aug 20 22:53 0000000000000089.page
-rw-r--r-- 1 root root  901120 Aug 20 22:53 0000000000000110.page
-rw-r--r-- 1 root root 2097152 Aug 20 22:53 0000000000000115.page
-rw-r--r-- 1 root root   98304 Aug 20 22:53 0000000000000116.page
-rw-r--r-- 1 root root   98304 Aug 20 22:53 0000000000000117.page
-rw-r--r-- 1 root root   98304 Aug 20 22:53 0000000000000118.page
-rw-r--r-- 1 root root   98304 Aug 20 22:53 0000000000000119.page
-rw-r--r-- 1 root root   49152 Aug 20 22:53 0000000000000120.page
-rw-r--r-- 1 root root   98304 Aug 20 22:53 0000000000000121.page
-rw-r--r-- 1 root root   98304 Aug 20 22:53 0000000000000122.page
-rw-r--r-- 1 root root   98304 Aug 20 22:53 0000000000000123.page
-rw-r--r-- 1 root root   98304 Aug 20 22:53 0000000000000124.page
-rw-r--r-- 1 root root   16384 Aug 20 22:53 18446744069414584320.page
[root@localhost FIL_PAGE_INDEX]#

分析数据字典

[root@localhost recovery_MySQL]# ./recover_dictionary.sh
Generating dictionary tables dumps... OK
Creating test database ... Warning: Using a password on the command line interface can be insecure.
OK
Creating dictionary tables in database test:
SYS_TABLES ... Warning: Using a password on the command line interface can be insecure.
OK
SYS_COLUMNS ... Warning: Using a password on the command line interface can be insecure.
OK
SYS_INDEXES ... Warning: Using a password on the command line interface can be insecure.
OK
SYS_FIELDS ... Warning: Using a password on the command line interface can be insecure.
OK
All OK
Loading dictionary tables data:
SYS_TABLES ... Warning: Using a password on the command line interface can be insecure.
34 recs OK
SYS_COLUMNS ... Warning: Using a password on the command line interface can be insecure.
3061 recs OK
SYS_INDEXES ... Warning: Using a password on the command line interface can be insecure.
206 recs OK
SYS_FIELDS ... Warning: Using a password on the command line interface can be insecure.
206 recs OK
All OK

关于MySQL数据字典恢复,也可以参考另外一篇文章:使用工具直接抽取MySQL数据字典

查看数据库中记录情况

[root@localhost recovery_MySQL]# MySQL -uroot -p123456
Warning: Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 34954
Server version: 5.6.21 MySQL Community Server (GPL)
Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MySQL> use test;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
MySQL> show tables;
+----------------+
| Tables_in_test |
+----------------+
| SYS_COLUMNS    |
| SYS_FIELDS     |
| SYS_INDEXES    |
| SYS_TABLES     |
+----------------+
4 rows in set (0.00 sec)
MySQL> SELECT NAME,ID from SYS_TABLES;
+-------------------------+----+
| NAME                    | ID |
+-------------------------+----+
| cnywmcom/zx_account_log | 31 |
| cnywmcom/zx_area_code   | 32 |
| cnywmcom/zx_goods_group | 33 |
| cnywmcom/zx_manage_type | 34 |
| cnywmcom/zx_order_goods | 35 |
| cnywmcom/zx_order_info  | 36 |
| cnywmcom/zx_param       | 37 |
| cnywmcom/zx_users       | 46 |
| cnywmcom/zx_user_type   | 38 |
| SYS_FOREIGN             | 11 |
| SYS_FOREIGN_COLS        | 12 |
+-------------------------+----+
11 rows in set (0.00 sec)
MySQL> select * from SYS_INDEXES;
+----------+-----+-----------------+----------+------+-------+---------+
| TABLE_ID | ID  | NAME            | N_FIELDS | TYPE | SPACE | PAGE_NO |
+----------+-----+-----------------+----------+------+-------+---------+
|       11 |  11 | ID_IND          |        1 |    3 |     0 |      46 |
|       11 |  12 | FOR_IND         |        1 |    0 |     0 |      47 |
|       11 |  13 | REF_IND         |        1 |    0 |     0 |      48 |
|       12 |  14 | ID_IND          |        2 |    3 |     0 |      49 |
|       31 |  65 | PRIMARY         |        1 |    3 |     0 |      50 |
|       31 |  66 | user_id         |        1 |    0 |     0 |     216 |
|       32 |  67 | PRIMARY         |        1 |    3 |     0 |      52 |
|       33 |  68 | PRIMARY         |        1 |    3 |     0 |     205 |
|       34 |  69 | PRIMARY         |        1 |    3 |     0 |      54 |
|       35 |  70 | PRIMARY         |        1 |    3 |     0 |      55 |
|       35 |  71 | order_id        |        1 |    0 |     0 |      56 |
|       35 |  72 | goods_id        |        1 |    0 |     0 |      57 |
|       36 |  73 | PRIMARY         |        1 |    3 |     0 |      59 |
|       36 |  74 | order_sn        |        1 |    2 |     0 |      60 |
|       36 |  75 | user_id         |        1 |    0 |     0 |      61 |
|       36 |  76 | order_status    |        1 |    0 |     0 |      62 |
|       36 |  77 | shipping_status |        1 |    0 |     0 |      63 |
|       36 |  78 | pay_status      |        1 |    0 |     0 |     192 |
|       36 |  79 | shipping_id     |        1 |    0 |     0 |     193 |
|       36 |  80 | pay_id          |        1 |    0 |     0 |     194 |
|       36 |  81 | extension_code  |        2 |    0 |     0 |     195 |
|       36 |  82 | agency_id       |        1 |    0 |     0 |     203 |
|       37 |  83 | PRIMARY         |        1 |    3 |     0 |     196 |
|       38 |  84 | PRIMARY         |        1 |    3 |     0 |     206 |
|       46 | 120 | PRIMARY         |        1 |    3 |     0 |      58 |
|       46 | 121 | user_name       |        1 |    2 |     0 |     256 |
|       46 | 122 | email           |        1 |    0 |     0 |     257 |
|       46 | 123 | parent_id       |        1 |    0 |     0 |     258 |
|       46 | 124 | flag            |        1 |    0 |     0 |     259 |
+----------+-----+-----------------+----------+------+-------+---------+
29 rows in set (0.00 sec)

通过这里，我们就可以明确的知道，我们需要恢复的表的page是多少了，这里举例说明恢复表cnywmcom.zx_account_log,我们需要去分析65号page

分析表恢复

[root@localhost recovery_MySQL]# ./c_parser -5f pages-ibdata1/FIL_PAGE_INDEX/0000000000000065.page -t dictionary/zx_account_log.sql|more
-- Page id: 223, Format: COMPACT, Records list: Invalid, Expected records: (0 7)
0B0C2000101C    55000230000000  zx_account_log  2979181 270888  "0"0"0.00"      "0.00"  "0.00"  2147483649      ""      0       ""      "0.00"  "-10643256.27"  "06."   "06."   "0782
7251.51"        "0.5"   "0.5"   "0.5"   "0.5"
000000042228    00000001040135  zx_account_log  561     1       "0.00"  "0.00"  "0.00"  "1.00"  "0.00"  1436840718      "会员注册"      99      "13818289939"   "1.00"  "0.00"  "0.00"  "0.00
"       "0.00"  "0.00"  "0.00"  "0.00"  "0.00"
000000042228    0000000104015A  zx_account_log  562     136     "0.00"  "0.00"  "0.00"  "1.00"  "0.00"  1436841067      "会员注册"      99      "17828025855"   "1.00"  "0.00"  "0.00"  "0.00
"       "0.00"  "0.00"  "0.00"  "0.00"  "0.00"
000000042228    0000000104017F  zx_account_log  563     137     "0.00"  "0.00"  "0.00"  "1.00"  "0.00"  1436842239      "会员注册"      99      "18617157667"   "1.00"  "0.00"  "0.00"  "0.00
"       "0.00"  "0.00"  "0.00"  "0.00"  "0.00"
000000042228    000000010401A4  zx_account_log  564     139     "0.00"  "0.00"  "0.00"  "1.00"  "0.00"  1436846738      "会员注册"      99      "18113070688"   "1.00"  "0.00"  "0.00"  "0.00
"       "0.00"  "0.00"  "0.00"  "0.00"  "0.00"
000000042228    000000010401C9  zx_account_log  565     1       "0.00"  "0.00"  "0.00"  "1.00"  "0.00"  1436848523      "会员注册"      99      "13623646573"   "1.00"  "0.00"  "0.00"  "0.00
"       "0.00"  "0.00"  "0.00"  "0.00"  "0.00"

至此该表的数据已经恢复出来,剩下任务就是把数据保存为文件,并且导入到新库中.然后依次处理相关表.至此完成这次drop database的恢复.在恢复过程中,遇到不少坑,比如有些记录在对应的page中无法找到,需要进行额外处理.对于乱码问题需要进一步处理等.通过一系列的恢复,给客户恢复了所有核心表,实现核心数据0丢失.通过这次的恢复,已经证明我们不光是Oracle恢复中的行业强者,在MySQL数据库的各种故障中,我们也有立足之地.如果有MySQL数据库的恢复(误删除数据/delete,误删除表/drop table,误截断表/truncate table,误删除数据库/drop database,MySQL不能启动,ibdata1文件损坏/丢失等MySQL各种恢复)请求,如果您遇到MySQL恢复问题无法自行解决,请联系我们提供专业服务,最大程度减小您的损失：

Phone:17813235971 Q Q:107644445 E-Mail:dba@xifenfei.com

[MySQL异常恢复]使用工具直接抽取MySQL数据字典

联系：手机/微信(+86 17813235971) QQ(107644445)

标题：[MySQL异常恢复]使用工具直接抽取MySQL数据字典

熟悉Oracle的朋友都知道,当Oracle数据库无法正常启动之时,可以通过dul或者其他三方工具直接读取数据文件中数据,从而来抢救数据,减少损失,在mysql中如果使用了innodb引擎也可以在mysql数据库不启动启动下抽取相关记录.本文为抽取数据字典篇章,后续将继续提供drop恢复,truncate 恢复,delete恢复等mysql非常规恢复篇章.
创建一张get_dict测试表

mysql> use xifenfei;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> show tables;
+--------------------+
| Tables_in_xifenfei |
+--------------------+
| t_delete           |
+--------------------+
1 row in set (0.00 sec)
mysql> create table get_dict(id int not null primary key,name varchar(100));
Query OK, 0 rows affected (0.01 sec)
mysql> insert into get_dict value(1,'www.xifenfei.com');
Query OK, 1 row affected (0.00 sec)
mysql> insert into get_dict value(2,'www.xifenfei.com-xifenfei');
Query OK, 1 row affected (0.00 sec)
mysql> insert into get_dict value(3,'xifenfei-www.xifenfei.com');
Query OK, 1 row affected (0.00 sec)
mysql> show tables;
+--------------------+
| Tables_in_xifenfei |
+--------------------+
| get_dict           |
| t_delete           |
+--------------------+
2 rows in set (0.00 sec
mysql> select TABLE_NAME,TABLE_SCHEMA,TABLE_TYPE from information_schema.tables
    -> where table_name='get_dict';
+------------+--------------+------------+
| TABLE_NAME | TABLE_SCHEMA | TABLE_TYPE |
+------------+--------------+------------+
| get_dict   | xifenfei     | BASE TABLE |
+------------+--------------+------------+
1 row in set (0.01 sec)
mysql> select TABLE_NAME,NON_UNIQUE,TABLE_SCHEMA,INDEX_SCHEMA,INDEX_NAME,COLUMN_NAME from
    -> INFORMATION_SCHEMA.STATISTICS where  TABLE_NAME='get_dict';
+------------+------------+--------------+--------------+------------+-------------+
| TABLE_NAME | NON_UNIQUE | TABLE_SCHEMA | INDEX_SCHEMA | INDEX_NAME | COLUMN_NAME |
+------------+------------+--------------+--------------+------------+-------------+
| get_dict   |          0 | xifenfei     | xifenfei     | PRIMARY    | id          |
+------------+------------+--------------+--------------+------------+-------------+
1 row in set (0.00 sec)
mysql> select TABLE_SCHEMA,TABLE_NAME,COLUMN_NAME,ORDINAL_POSITION from
    -> information_schema.COLUMNS  where table_name='get_dict';
+--------------+------------+-------------+------------------+
| TABLE_SCHEMA | TABLE_NAME | COLUMN_NAME | ORDINAL_POSITION |
+--------------+------------+-------------+------------------+
| xifenfei     | get_dict   | id          |                1 |
| xifenfei     | get_dict   | name        |                2 |
+--------------+------------+-------------+------------------+
2 rows in set (0.01 sec)

关闭mysql数据库

[root@localhost recovery_mysql]# service mysql stop
Shutting down MySQL..[  OK  ]
[root@localhost recovery_mysql]# ps -ef|grep mysql
root     18876 15827  0 18:05 pts/1    00:00:00 grep mysql

使用工具解析innodb文件

[root@localhost recovery_mysql]# ./stream_parser -f /var/lib/mysql/ibdata1
Opening file: /var/lib/mysql/ibdata1
File information:
Opening file: /var/lib/mysql/ibdata1
File information:
ID of device containing file:         2054
inode number:                      1782889
ID of device containing file:         2054
protection:                         100660 inode number:                      1782889
(regular file)
protection:                         100660 number of hard links:                    1
(regular file)
user ID of owner:                      101
number of hard links:                    1
group ID of owner:                     102
user ID of owner:                      101
device ID (if special file):             0
group ID of owner:                     102
blocksize for filesystem I/O:         4096
device ID (if special file):             0
number of blocks allocated:          24616
blocksize for filesystem I/O:         4096
Opening file: /var/lib/mysql/ibdata1
number of blocks allocated:          24616
File information:
………………
user ID of owner:                      101
group ID of owner:                     102
device ID (if special file):             0
blocksize for filesystem I/O:         4096
ID of device containing file:         2054
number of blocks allocated:          24616
inode number:                      1782889
protection:                         100660 (regular file)
number of hard links:                    1
user ID of owner:                      101
group ID of owner:                     102
device ID (if special file):             0
blocksize for filesystem I/O:         4096
number of blocks allocated:          24616
time of last access:            1417922668 Sun Dec  7 11:24:28 2014
time of last modification:      1418294104 Thu Dec 11 18:35:04 2014
time of last status change:     1418294104 Thu Dec 11 18:35:04 2014
time of last access:            1417922668 Sun Dec  7 11:24:28 2014
total size, in bytes:             12582912 (12.000 MiB)
time of last modification:      1418294104 Thu Dec 11 18:35:04 2014
time of last status change:     1418294104 Thu Dec 11 18:35:04 2014
Size to process:                  12582912 (12.000 MiB)
total size, in bytes:             12582912 (12.000 MiB)
Size to process:                  12582912 (12.000 MiB)
All workers finished in 0 sec

主要文件介绍

[root@localhost recovery_mysql]# ls -l  pages-ibdata1/FIL_PAGE_INDEX/
total 1388
-rw-r--r-- 1 root root  16384 Dec 11 18:51 0000000000000001.page
-rw-r--r-- 1 root root  16384 Dec 11 18:51 0000000000000002.page
-rw-r--r-- 1 root root  49152 Dec 11 18:51 0000000000000003.page
-rw-r--r-- 1 root root  49152 Dec 11 18:51 0000000000000004.page
-rw-r--r-- 1 root root  16384 Dec 11 18:51 0000000000000005.page
-rw-r--r-- 1 root root 114688 Dec 11 18:51 0000000000000011.page
-rw-r--r-- 1 root root 114688 Dec 11 18:51 0000000000000012.page
-rw-r--r-- 1 root root 114688 Dec 11 18:51 0000000000000013.page
-rw-r--r-- 1 root root 114688 Dec 11 18:51 0000000000000014.page
-rw-r--r-- 1 root root 114688 Dec 11 18:51 0000000000000015.page
-rw-r--r-- 1 root root 147456 Dec 11 18:51 0000000000000016.page
-rw-r--r-- 1 root root  98304 Dec 11 18:51 0000000000000017.page
-rw-r--r-- 1 root root 114688 Dec 11 18:51 0000000000000018.page
-rw-r--r-- 1 root root  49152 Dec 11 18:51 0000000000000019.page
-rw-r--r-- 1 root root  49152 Dec 11 18:51 0000000000000020.page
-rw-r--r-- 1 root root  49152 Dec 11 18:51 0000000000000021.page
-rw-r--r-- 1 root root  65536 Dec 11 18:51 0000000000000025.page
-rw-r--r-- 1 root root  16384 Dec 11 18:51 18446744069414584320.page

0000000000000001.page主要是记录mysql中表信息文件
0000000000000002.page主要是记录mysql中的表的列的信息文件
0000000000000003.page主要是记录mysql中表的index信息文件

抽取table数据

[root@localhost recovery_mysql]# ./c_parser -4f pages-ibdata1/FIL_PAGE_INDEX/0000000000000001.page -t
dictionary/SYS_TABLES.sql > dumps/default/SYS_TABLES 2> dumps/default/SYS_TABLES.sql
[root@localhost recovery_mysql]# grep get dumps/default/SYS_TABLES | head -5
000000000D1D    95000001510110  SYS_TABLES      "xifenfei/get\_dict"    23      2       1       0       80      ""      9
[root@localhost recovery_mysql]# cat dumps/default/SYS_TABLES.sql
SET FOREIGN_KEY_CHECKS=0;
LOAD DATA LOCAL INFILE '/tmp/recovery_mysql/dumps/default/SYS_TABLES' REPLACE INTO TABLE `SYS_TABLES`
FIELDS TERMINATED BY '\t' OPTIONALLY ENCLOSED BY '"' LINES STARTING BY 'SYS_TABLES\t'
 (`NAME`, `ID`, `N_COLS`, `TYPE`, `MIX_ID`, `MIX_LEN`, `CLUSTER_NAME`, `SPACE`);

抽取column数据

[root@localhost recovery_mysql]#  ./c_parser -4f pages-ibdata1/FIL_PAGE_INDEX/0000000000000002.page
 -t dictionary/SYS_COLUMNS.sql > dumps/default/SYS_COLUMNS 2> dumps/default/SYS_COLUMNS.sql
[root@localhost recovery_mysql]# cat dumps/default/SYS_COLUMNS
-- Page id: 10, Format: REDUNDANT, Records list: Valid, Expected records: (115 115)
000000000300    800000012D0123  SYS_COLUMNS     11      0       "ID"    1       4       0       0
000000000300    800000012D0138  SYS_COLUMNS     11      1       "FOR\_NAME"     1       4       0       0
…………
000000000D1D    95000001510129  SYS_COLUMNS     23      0       "id"    6       1283    4       0
000000000D1D    9500000151013E  SYS_COLUMNS     23      1       "name"  1       524303  100     0
-- Page id: 10, Found records: 115, Lost records: NO, Leaf page: YES
[root@localhost recovery_mysql]# more dumps/default/SYS_COLUMNS.sql
SET FOREIGN_KEY_CHECKS=0;
LOAD DATA LOCAL INFILE '/tmp/recovery_mysql/dumps/default/SYS_COLUMNS' REPLACE INTO TABLE
 `SYS_COLUMNS` FIELDS TERMINATED BY '\t' OPTIONALLY ENCLOSED BY
'"' LINES STARTING BY 'SYS_COLUMNS\t' (`TABLE_ID`, `POS`, `NAME`, `MTYPE`, `PRTYPE`, `LEN`, `PREC`);

抽取index数据

[root@localhost recovery_mysql]# ./c_parser -4f pages-ibdata1/FIL_PAGE_INDEX/0000000000000003.page
 -t dictionary/SYS_INDEXES.sql > dumps/default/SYS_INDEXES 2> dumps/default/SYS_INDEXES.sql
[root@localhost recovery_mysql]# more dumps/default/SYS_INDEXES.sql
SET FOREIGN_KEY_CHECKS=0;
LOAD DATA LOCAL INFILE '/tmp/recovery_mysql/dumps/default/SYS_INDEXES' REPLACE INTO TABLE
 `SYS_INDEXES` FIELDS TERMINATED BY '\t' OPTIONALLY ENCLOSED BY '"' LINES STARTING BY 'SYS_INDEXES\t'
(`TABLE_ID`, `ID`, `NAME`, `N_FIELDS`, `TYPE`, `SPACE`, `PAGE_NO`);
[root@localhost recovery_mysql]# more dumps/default/SYS_INDEXES
-- Page id: 11, Format: REDUNDANT, Records list: Valid, Expected records: (13 13)
000000000300    800000012D0177  SYS_INDEXES     11      11      "ID\_IND"       1       3       0       302
…………
000000000B02    820000013504C8  SYS_INDEXES     20      22      "GEN\_CLUST\_INDEX"     0       1       6       3
000000000D1D    9500000151016B  SYS_INDEXES     23      25      "PRIMARY"       1       3       9       3

启动mysql数据库

[root@localhost recovery_mysql]# service mysql start
Starting MySQL..[  OK  ]
[root@localhost recovery_mysql]# ps -ef|grep mysql
root     18948     1  0 19:57 pts/1    00:00:00 /bin/sh /usr/bin/mysqld_safe --datadir=/var/lib/mysql
--pid-file=/var/lib/mysql/localhost.localdomain.pid
mysql    19049 18948 14 19:57 pts/1    00:00:00 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql
--plugin-dir=/usr/lib64/mysql/plugin --user=mysql
--log-error=/var/lib/mysql/localhost.localdomain.err --pid-file=/var/lib/mysql/localhost.localdomain.pid
root     19078 15827  0 19:58 pts/1    00:00:00 grep mysql

创建抽取数据字典表

mysql> source dictionary/SYS_TABLES.sql
Query OK, 0 rows affected (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
…………
mysql> source dictionary/SYS_INDEXES.sql
Query OK, 0 rows affected (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
…………
mysql> source  dictionary/SYS_COLUMNS.sql
Query OK, 0 rows affected (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
…………
mysql> show tables;
+----------------+
| Tables_in_test |
+----------------+
| SYS_COLUMNS    |
| SYS_INDEXES    |
| SYS_TABLES     |
+----------------+
3 rows in set (0.00 sec)

加载抽取数据字典数据

mysql> source dumps/default/SYS_TABLES.sql
Query OK, 0 rows affected (0.00 sec)
Query OK, 11 rows affected (0.03 sec)
Records: 11  Deleted: 0  Skipped: 0  Warnings: 0
mysql> source  dumps/default/SYS_INDEXES.sql
Query OK, 0 rows affected (0.00 sec)
Query OK, 39 rows affected (0.01 sec)
Records: 39  Deleted: 0  Skipped: 0  Warnings: 0
mysql> source dumps/default/SYS_COLUMNS.sql
Query OK, 0 rows affected (0.00 sec)
Query OK, 115 rows affected (0.00 sec)
Records: 115  Deleted: 0  Skipped: 0  Warnings: 0

验证抽取数据字典数据

mysql> desc SYS_TABLES
    -> ;
+--------------+---------------------+------+-----+---------+-------+
| Field        | Type                | Null | Key | Default | Extra |
+--------------+---------------------+------+-----+---------+-------+
| NAME         | varchar(255)        | NO   | PRI |         |       |
| ID           | bigint(20) unsigned | NO   |     | 0       |       |
| N_COLS       | int(10)             | YES  |     | NULL    |       |
| TYPE         | int(10) unsigned    | YES  |     | NULL    |       |
| MIX_ID       | bigint(20) unsigned | YES  |     | NULL    |       |
| MIX_LEN      | int(10) unsigned    | YES  |     | NULL    |       |
| CLUSTER_NAME | varchar(255)        | YES  |     | NULL    |       |
| SPACE        | int(10) unsigned    | YES  |     | NULL    |       |
+--------------+---------------------+------+-----+---------+-------+
8 rows in set (0.00 sec)
mysql> SELECT NAME,ID from SYS_TABLES WHERE NAME='xifenfei/get_dict';
+-------------------+----+
| NAME              | ID |
+-------------------+----+
| xifenfei/get_dict | 23 |
+-------------------+----+
1 row in set (0.00 sec)
mysql> desc SYS_COLUMNS
    -> ;
+----------+---------------------+------+-----+---------+-------+
| Field    | Type                | Null | Key | Default | Extra |
+----------+---------------------+------+-----+---------+-------+
| TABLE_ID | bigint(20) unsigned | NO   | PRI | NULL    |       |
| POS      | int(10) unsigned    | NO   | PRI | NULL    |       |
| NAME     | varchar(255)        | YES  |     | NULL    |       |
| MTYPE    | int(10) unsigned    | YES  |     | NULL    |       |
| PRTYPE   | int(10) unsigned    | YES  |     | NULL    |       |
| LEN      | int(10) unsigned    | YES  |     | NULL    |       |
| PREC     | int(10) unsigned    | YES  |     | NULL    |       |
+----------+---------------------+------+-----+---------+-------+
7 rows in set (0.00 sec)
mysql> SELECT TABLE_ID,NAME,MTYPE FROM SYS_COLUMNS WHERE TABLE_ID=23;
+----------+------+-------+
| TABLE_ID | NAME | MTYPE |
+----------+------+-------+
|       23 | id   |     6 |
|       23 | name |     1 |
+----------+------+-------+
2 rows in set (0.01 sec)
mysql> SELECT TABLE_ID,ID,NAME,TYPE FROM SYS_INDEXES WHERE TABLE_ID=23;
+----------+----+---------+------+
| TABLE_ID | ID | NAME    | TYPE |
+----------+----+---------+------+
|       23 | 25 | PRIMARY |    3 |
+----------+----+---------+------+
1 row in set (0.00 sec)

这里基本上可以看出来,在mysql数据库未启动情况下,使用工具可以正常抽取mysql数据字典信息

标签归档：MySQL恢复