ORACLE 12C 支持multiple partitions同时操作

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标题：ORACLE 12C 支持multiple partitions同时操作

作者：惜分飞©版权所有[未经本人同意,不得以任何形式转载,否则有进一步追究法律责任的权利.]

ORACLE 12C在分区维护方面有了不少的增强,在12C的beta版本中已经支持多分区的add/truncate/drop/merge操作,大大的提高了分区维护的效率.
数据库版本

SQL> select * from v$version;
BANNER                                                                               CON_ID
-------------------------------------------------------------------------------- ----------
Oracle Database 12c Enterprise Edition Release 12.1.0.0.2 - 64bit                         0
PL/SQL Release 12.1.0.0.2                                                                 0
CORE    12.1.0.0.2                                                                        0
TNS for Linux: Version 12.1.0.0.2                                                         0
NLSRTL Version 12.1.0.0.2                                                                 0

在FF PDB中创建xff用户

SQL> alter session set container=ff;
Session altered.
SQL> create user xff identified by xifenfei;
User created.
SQL> grant dba to xff;
Grant succeeded.
SQL> conn xff/xifenfei@ff
Connected.
SQL> show con_name;
CON_NAME
------------------------------
FF

创建分区表RANGE PARTITIONS

SQL> CREATE TABLE t_xifenfei
  2  (name varchar2(100),time_id DATE)
  3  partition by range(time_id)
  4  (partition xff_2006 values less than (TO_DATE('01-01-2007','dd-MM-yyyy')),
  5  partition xff_2007 values less than (TO_DATE('01-01-2008','dd-MM-yyyy')),
  6  partition xff_2008 values less than (TO_DATE('01-01-2009','dd-MM-yyyy')),
  7  partition xff_2009 values less than (TO_DATE('01-01-2010','dd-MM-yyyy')));
Table created.
SQL> SET LONG 30
SQL> select PARTITION_NAME,HIGH_VALUE FROM USER_TAB_PARTITIONS where table_name='T_XIFENFEI';
PARTITION_NAME                 HIGH_VALUE
------------------------------ ------------------------------
XFF_2006                       TO_DATE(' 2007-01-01 00:00:00'
XFF_2007                       TO_DATE(' 2008-01-01 00:00:00'
XFF_2008                       TO_DATE(' 2009-01-01 00:00:00'
XFF_2009                       TO_DATE(' 2010-01-01 00:00:00'

ADD 多个分区

SQL> ALTER TABLE t_xifenfei ADD
  2    PARTITION XFF_2010 VALUES LESS THAN (TO_DATE('01-01-2011','dd-MM-yyyy')),
  3    PARTITION XFF_2011 VALUES LESS THAN (TO_DATE('01-01-2012','dd-MM-yyyy')),
  4    PARTITION XFF_2012 VALUES LESS THAN (TO_DATE('01-01-2013','dd-MM-yyyy'));
Table altered.
SQL> select PARTITION_NAME,HIGH_VALUE FROM USER_TAB_PARTITIONS where table_name='T_XIFENFEI';
PARTITION_NAME                 HIGH_VALUE
------------------------------ ------------------------------
XFF_2006                       TO_DATE(' 2007-01-01 00:00:00'
XFF_2007                       TO_DATE(' 2008-01-01 00:00:00'
XFF_2008                       TO_DATE(' 2009-01-01 00:00:00'
XFF_2009                       TO_DATE(' 2010-01-01 00:00:00'
XFF_2010                       TO_DATE(' 2011-01-01 00:00:00'
XFF_2011                       TO_DATE(' 2012-01-01 00:00:00'
XFF_2012                       TO_DATE(' 2013-01-01 00:00:00'
7 rows selected.

Split多个分区

SQL> ALTER TABLE t_xifenfei  split PARTITION  XFF_2012 INTO
  2    (PARTITION XFF_2012_03 VALUES LESS THAN (TO_DATE('01-03-2012','dd-MM-yyyy')),
  3    PARTITION XFF_2012_06 VALUES LESS THAN (TO_DATE('01-06-2012','dd-MM-yyyy')),
  4    PARTITION XFF_2012_09 VALUES LESS THAN (TO_DATE('01-09-2012','dd-MM-yyyy')),
  5    PARTITION XFF_2012);
Table altered.
SQL>  select PARTITION_NAME,HIGH_VALUE FROM USER_TAB_PARTITIONS where table_name='T_XIFENFEI';
PARTITION_NAME                 HIGH_VALUE
------------------------------ ------------------------------
XFF_2006                       TO_DATE(' 2007-01-01 00:00:00'
XFF_2007                       TO_DATE(' 2008-01-01 00:00:00'
XFF_2008                       TO_DATE(' 2009-01-01 00:00:00'
XFF_2009                       TO_DATE(' 2010-01-01 00:00:00'
XFF_2010                       TO_DATE(' 2011-01-01 00:00:00'
XFF_2011                       TO_DATE(' 2012-01-01 00:00:00'
XFF_2012                       TO_DATE(' 2013-01-01 00:00:00'
XFF_2012_03                    TO_DATE(' 2012-03-01 00:00:00'
XFF_2012_06                    TO_DATE(' 2012-06-01 00:00:00'
XFF_2012_09                    TO_DATE(' 2012-09-01 00:00:00'
10 rows selected.

插入分区数据

SQL>INSERT INTO t_xifenfei VALUES('www.xifenfei.com',SYSDATE-100);
1 row created.
SQL> INSERT INTO t_xifenfei VALUES('www.xifenfei.com',SYSDATE-200);
1 row created.
SQL> INSERT INTO t_xifenfei VALUES('www.xifenfei.com',SYSDATE-300);
1 row created.
SQL>  INSERT INTO t_xifenfei VALUES('www.xifenfei.com',SYSDATE-10);
1 row created.
SQL> commit;
Commit complete.
SQL> col name for a20
SQL> select * from t_xifenfei;
NAME                 TIME_ID
-------------------- ---------
www.xifenfei.com     17-FEB-12
www.xifenfei.com     27-MAY-12
www.xifenfei.com     04-SEP-12
www.xifenfei.com     03-DEC-12
SQL>select * from t_xifenfei PARTITION(XFF_2012_03);
NAME                 TIME_ID
-------------------- ---------
www.xifenfei.com     17-FEB-12
SQL> select * from t_xifenfei PARTITION(XFF_2012_06);
NAME                 TIME_ID
-------------------- ---------
www.xifenfei.com     27-MAY-12
SQL>  select * from t_xifenfei PARTITION(XFF_2012_09);
no rows selected
SQL>  select * from t_xifenfei PARTITION(XFF_2012);
NAME                 TIME_ID
-------------------- ---------
www.xifenfei.com     04-SEP-12
www.xifenfei.com     03-DEC-12

TRUNCATE 多个分区

SQL> Alter table t_xifenfei truncate partitions XFF_2012_03, XFF_2012_06, XFF_2012_09;
Table truncated.
--剩下两条记录存在于XFF_2012中
SQL> select * from t_xifenfei;
NAME                 TIME_ID
-------------------- ---------
www.xifenfei.com     04-SEP-12
www.xifenfei.com     03-DEC-12
SQL> SELECT SUBOBJECT_NAME,object_id,data_object_id from user_objects where SUBOBJECT_NAME like 'XFF_2012_0%';
SUBOBJECT_NAME                  OBJECT_ID DATA_OBJECT_ID
------------------------------ ---------- --------------
XFF_2012_09                         90603          90603    <---为什么没有变
XFF_2012_06                         90602          90606
XFF_2012_03                         90601          90605
SQL> select PARTITION_NAME,HIGH_VALUE,SEGMENT_CREATED FROM USER_TAB_PARTITIONS where table_name='T_XIFENFEI';
PARTITION_NAME                 HIGH_VALUE                     SEGM
------------------------------ ------------------------------ ----
XFF_2006                       TO_DATE(' 2007-01-01 00:00:00' NO
XFF_2007                       TO_DATE(' 2008-01-01 00:00:00' NO
XFF_2008                       TO_DATE(' 2009-01-01 00:00:00' NO
XFF_2009                       TO_DATE(' 2010-01-01 00:00:00' NO
XFF_2010                       TO_DATE(' 2011-01-01 00:00:00' NO
XFF_2011                       TO_DATE(' 2012-01-01 00:00:00' NO
XFF_2012                       TO_DATE(' 2013-01-01 00:00:00' YES
XFF_2012_03                    TO_DATE(' 2012-03-01 00:00:00' YES
XFF_2012_06                    TO_DATE(' 2012-06-01 00:00:00' YES
XFF_2012_09                    TO_DATE(' 2012-09-01 00:00:00' NO
--XFF_2012_09因为块延迟创建,没有segment导致truncate对应的dataobj#不变
10 rows selected.

DROP 多个分区

SQL>  Alter table t_xifenfei DROP  partitions XFF_2012_03, XFF_2012_06, XFF_2012_09;
Table altered.
SQL> select PARTITION_NAME,HIGH_VALUE FROM USER_TAB_PARTITIONS where table_name='T_XIFENFEI';
PARTITION_NAME                 HIGH_VALUE
------------------------------ ------------------------------
XFF_2006                       TO_DATE(' 2007-01-01 00:00:00'
XFF_2007                       TO_DATE(' 2008-01-01 00:00:00'
XFF_2008                       TO_DATE(' 2009-01-01 00:00:00'
XFF_2009                       TO_DATE(' 2010-01-01 00:00:00'
XFF_2010                       TO_DATE(' 2011-01-01 00:00:00'
XFF_2011                       TO_DATE(' 2012-01-01 00:00:00'
XFF_2012                       TO_DATE(' 2013-01-01 00:00:00'
7 rows selected.

MERGE 多分区

SQL> Alter table t_xifenfei merge partitions XFF_2006, XFF_2007, XFF_2008 into partition XFF_OLD;
Table altered.
SQL> select PARTITION_NAME,HIGH_VALUE FROM USER_TAB_PARTITIONS where table_name='T_XIFENFEI';
PARTITION_NAME                 HIGH_VALUE
------------------------------ ------------------------------
XFF_2009                       TO_DATE(' 2010-01-01 00:00:00'
XFF_2010                       TO_DATE(' 2011-01-01 00:00:00'
XFF_2011                       TO_DATE(' 2012-01-01 00:00:00'
XFF_2012                       TO_DATE(' 2013-01-01 00:00:00'
XFF_OLD                        TO_DATE(' 2009-01-01 00:00:00'

本测试是基于Range partitions进行,其实在ORACLE 12C中对于分区表的维护做了比较大的增强,上面试验的多分区操作,也支持List partitions和subpartitions.ddl一次性操作多个分区,给分区经常做维护的DBA来说,带来了不少的方便,省去了很多重复行工作.

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