ORA-00600 [2662]
一、错误现象(alert日志中)
Errors in file /opt/oracle/admin/conner/udump/conner_ora_31607.trc:
ORA-00600: internal error code, arguments: [2662], [0], [897694446], [0], [897695488], [8388697], [], []
二、错误解释
ORA-600 [2662] “Block SCN is ahead of Current SCN”,说明当前数据库的数据块的SCN早于当前的SCN,主要是和存储在UGA变量中的dependent SCN进行比较,如果当前的SCN小于它,数据库就会产生这个ORA-600 [2662]的错误了。这个错误一共有五个参数,分别代表不同的含义
ORA-600 [2662] [a] [b] {c} [d] [e]
Arg [a] Current SCN WRAP
Arg [b] Current SCN BASE
Arg {c} dependent SCN WRAP
Arg [d] dependent SCN BASE
Arg [e] Where present this is the DBA where the dependent SCN came from.
注:897694446<897695488
三、错误原因
1.使用隐含参数_ALLOW_RESETLOGS_CORRUPTION后resetlogs打开数据库
2.硬件错误引起数据库没法写控制文件和重做日志文件
3.错误的部分恢复数据库
4.恢复了控制文件但是没有使用recover database using backup controlfile进行恢复
5.数据库crash后设置了_DISABLE_LOGGING隐含参数
6.在并行服务器环境中DLM存在问题
四、解决办法
1、如果SCN相差不多,可以通过多次重起数据库解决(每次加1)
2、通过10015 ADJUST_SCN事件来增进current SCN
1)计算level
1.1) Arg {c}* 4得出一个数值,假设为V_Wrap
1.2) 如果Arg [d]=0,则V_Wrap值为需要的level
Arg [d] < 1073741824,V_Wrap+1为需要的level
Arg [d] < 2147483648,V_Wrap+2为需要的level
Arg [d] < 3221225472,V_Wrap+3为需要的level
1.3)SCN被增进了1024*1024*1024*level(level*10 billion)
2)执行内部事件
alter session set events ‘10015 trace name adjust_scn level N’;
注:mount状态下执行(open下无效)
alert日志中会出现:
Sat Aug 20 15:41:07 2011
Debugging event used to advance scn to 107374182400
SCN与Oracle数据库恢复的关系
一、SCN类型
1).System Checkpoint SCN
当checkpoint完成后,ORACLE将System Checkpoint SCN号存放在控制文件中。
我们可以通过下面SQL语句查询:
select checkpoint_change# from v$database;
2).Datafile Checkpoint SCN
当一个检查点动作完成之后,Oracle就把每个数据文件的scn单独存放在控制文件中.
我们可以通过下面SQL语句查询所有数据文件的Datafile Checkpoinnt SCN号。
select name,checkpoint_change# from v$datafile;
3).Start SCN (启动SCN)
checkpoint完成后,将产生的checkpoint SCN 写入数据文件头(称之为start scn).这个SCN用于检查数据库启动过程是否需要做media recovery.
我们可以通过以下SQL语句查询:
select name,checkpoint_change# from v$datafile_header;
注意:数据文件头中的检查点SCN(start SCN) 与控制文件中记录的数据文件检查点SCN号含义是一样的。 也就是说,一旦发生全局范围以及文件级别的检查点时,不仅会将这时的检查点SCN号记录到控制文件,还会记录在检查点作用的数据文件头部。
4).End SCN号(stop scn, 终止SCN)
这个SCN号用于检查数据库启动过程是否需要做instance recovery.
我们可以通过以下SQL语句查询:
select name,last_change# from v$datafile;
在正常的数据库操作过程中,所有正处于联机读写模式下的数据文件的终止scn都为null.
二、各SCN之间关系
1)数据库运行期间的scn值
在数据库打开并运行之后,控制文件中的系统检查点、控制文件中的数据文件检查点scn和每个数据文件头中的启动scn都是相同的。控制文件中的每个数据文件的终止scn都为null.
2)数据库正常关闭的scn值
在安全关闭数据库的过程中,系统会执行一个检查点动作,这时所有数据文件的终止scn都会设置成数据文件头中的那个启动scn的值。
3)数据库重启过程中scn作用
在数据库重新启动的时候, Oracle将文件头中的那个启动scn与数据库文件检查点scn(控制文件中)进行比较,如果这两个值相互匹配,那么不需要Media Recovery, oracle接下来还要比较数据文件头中的启动scn和控制文件中数据文件的终止scn, 如果这两个值也一致,就意味着所有对数据库的修改都没有在关闭数据库的过程中丢失,因此这次启动数据库的过程也不需要任何恢复操作(即不需要实例恢复),此时数据库就可以打开了。当所有的数据库都打开之后,存储在控制文件中的数据文件终止scn的值再次被更改为null,这表示数据文件已经打开并能够正常使用了。
还需要注意的是:
在数据库重新启动的时候, Oracle首先比较(每个)文件头中的那个启动scn (start SCN) 与控制文件中记录的 (每个) 数据库文件检查点scn, 如果他们都相互匹配,那么不需要Media Recovery. 但是如果只是控制文件中记录的数据文件检查点(多个数据文件,对应多个SCN), 与 (对应的) 数据文件头中的启动SCN (start scn) 相同 , 而在每个在线的可读可写的数据文件“之间”,他们的检查点SCN不相同, 那么也要求Media Recovery .
ORA-01244/ORA-01110解决
rman 恢复过程中出现以下错误
RMAN> recover database; Starting recover at 20-AUG-11 using channel ORA_DISK_1 starting media recovery archive log filename=/opt/oracle/product/9.2.0/db_1/dbs/arch1_13.dbf thread=1 sequence=13 RMAN-00571: =========================================================== RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS =============== RMAN-00571: =========================================================== RMAN-03002: failure of recover command at 08/20/2011 03:54:30 ORA-00283: recovery session canceled due to errors RMAN-11003: failure during parse/execution of SQL statement: alter database recover logfile '/opt/oracle/product/9.2.0/db_1/dbs/arch1_13.dbf' ORA-00283: recovery session canceled due to errors ORA-01244: unnamed datafile(s) added to controlfile by media recovery ORA-01110: data file 2: '/opt/oracle/oradata/xifenfei/xff01.dbf'
错误原因分析
在rman备份后,添加了数据文件,使用的是备份的控制文件进行恢复数据库导致(不能识别新的数据文件)
解决方法
通过sqlplus创建数据文件
SQL> alter database create datafile 2 as ‘/opt/oracle/oradata/xifenfei/xff01.dbf’;
Database altered.
然后继续在rman中执行恢复数据库操作
该情况说明
此中情况只有在oracle 9i中出现;在10g中,rman恢复过程会自动的创建新添加文件,见oracle 10g rman自动创建数据文件
undo异常处理步骤(9i)
1、启动数据库,发现错误
startup
2、查看是否是undo文件损坏引起,并查看是否是当前undo,不是当前undo直接offline,然后open数据库,再删除掉该数据该undo即可
select a.ts#,a.name,b.name from v$datafile a,v$tablespace b where a.ts#=b.ts#;
show parameter undo_tablespace;
3、损坏undo离线,创建pfile文件
alter database datafile n offline drop;
create pfile=’/tmp/pfile’ from spfile;
4、打开数据库,如果打开失败,请继续5,如果成功按照undo异常处理步骤(10g)方法处理
alter database open;
5、如果数据库不能正常打开,而是提示,如下错误:
ERROR at line 1:
ORA-01092: ORACLE instance terminated. Disconnection forced
6、检查日志文件,发现如下:
SMON: about to recover undo segment 21
SMON: mark undo segment 21 as needs recovery
SMON: about to recover undo segment 22
SMON: mark undo segment 22 as needs recovery
SMON: about to recover undo segment 23
SMON: mark undo segment 23 as needs recovery
SMON: about to recover undo segment 24
SMON: mark undo segment 24 as needs recovery
SMON: about to recover undo segment 25
SMON: mark undo segment 25 as needs recovery
SMON: about to recover undo segment 26
SMON: mark undo segment 26 as needs recovery
SMON: about to recover undo segment 27
SMON: mark undo segment 27 as needs recovery
SMON: about to recover undo segment 28
SMON: mark undo segment 28 as needs recovery
SMON: about to recover undo segment 29
SMON: mark undo segment 29 as needs recovery
SMON: about to recover undo segment 30
SMON: mark undo segment 30 as needs recovery
7、编辑pfile文件,内容为
*.undo_management=’MANUAL’
*._allow_resetlogs_corruption=true
*._corrupted_rollback_segments=(_SYSSMU21$,_SYSSMU22$,_SYSSMU23$,_SYSSMU24$,
_SYSSMU25$,_SYSSMU26$,_SYSSMU27$,_SYSSMU28$,_SYSSMU29$,_SYSSMU30$)
*.undo_tablespace=’SYSTEM’
8、退出当前sqlplus,重新登录,利用pfile启动数据库
startup
9、创建新undo表空间
CREATE UNDO TABLESPACE UNDOTBSNEW DATAFILE
‘/opt/oracle/oradata/xifenfei/UNDOTBS01.dbf
SIZE 50M autoextend on next 10m maxsize 30G;
10、查询回滚段信息,为下面删除损坏undo的回滚段做到心中有底
select segment_name,status from dba_rollback_segs;
11、删除损坏undo
drop tablespace UNDOTBSOLD including contents and datafiles;
12、查看回滚段状态
select segment_name,status from dba_rollback_segs;
13、如果有损坏表空间回滚段还存在,手工删除
drop rollback segment “_SYSSMUx$”;
14、修改pfile内容
*.undo_management=’AUTO’
#*._allow_resetlogs_corruption=true
#*._corrupted_rollback_segments=(_SYSSMU21$,_SYSSMU22$,_SYSSMU23$,_SYSSMU24$,
_SYSSMU25$,_SYSSMU26$,_SYSSMU27$,_SYSSMU28$,_SYSSMU29$,_SYSSMU30$)
*.undo_tablespace=’UNDOTBSNEW’
15、重启数据库
shutdown immediate
startup
说明:可以先删除需要恢复的回滚段,再删除损坏的undo表空间
诡异dblink问题解决
一、诡异dblink起源
今天开发拿过来一条sql,说有诡异现象,sql如下
INSERT INTO TAB_CS_CALLLOG select c.user_logon,/*工号*/c.user_name,/*姓名*/a.call_id,/*通话id*/ a.caller_nbr,/*主叫号码*/a.called_nbr,/*被叫号码*/d.start_time,/*呼入时间*/ b.call_time,/*接听时间*/b.end_time,/*结束时间*/b.call_dura,/*时长*/ to_number(b.call_time-d.start_time)*24*3600,/*等待时长*/ decode(c.user_logon,null,0,1),/*类型*/ case when substr (a.CALLED_NBR,7, 2) = '00' then '广东移动' when substr (a.CALLED_NBR,7, 2) = '01' then '浙江移动' when substr (a.CALLED_NBR,7, 2) = '02' then '福建' when substr (a.CALLED_NBR,7, 2) = '03' then '四川' when substr (a.CALLED_NBR,7, 2) = '04' then '河南' when substr (a.CALLED_NBR,7, 2) = '05' then '湖北' when substr (a.CALLED_NBR,7, 2) = '06' then '北京CSIP' when substr (a.CALLED_NBR,7, 2) = '07' then '陕西' when substr (a.CALLED_NBR,7, 2) = '08' then '吉林' when substr (a.CALLED_NBR,7, 2) = '09' then '江西' when substr (a.CALLED_NBR,7, 2) = '10' then '宁夏' when substr (a.CALLED_NBR,7, 2) = '11' then '太原' when substr (a.CALLED_NBR,7, 2) = '12' then '江苏移动' when substr (a.CALLED_NBR,7, 2) = '13' then 'e掌管' when substr (a.CALLED_NBR,7, 2) = '15' then 'e多商' when substr (a.CALLED_NBR,7, 2) = '18' then '江苏联通' end 区域 from cscnew.a@cs a,cscnew.b@cs b,cscnew.c@cs c,cscnew.d@cs d where a.call_serial=b.call_serial(+) and b.call_serial=d.call_serial(+) and b.user_id=c.user_id(+) and substr(a.CALLED_NBR,1, 6) = '951654' and length (a.CALLED_NBR) = 15 and b.fail_reason is null and a.end_time>=to_date('20110822000000','yyyymmddhh24miss') and a.end_time<to_date('20110823000000','yyyymmddhh24miss');
然后我进行了测试,证实了她所说的诡异:
1、直接执行select语句需要1.7S左右,但是加上insert inot后,执行时间需要6分钟
2、直接select结果集为602条,加上insert into后,结果集为598条(少4条),如果直接执行select,除掉and b.fail_reason is null限制条件也刚好602条
二、查询相关资料,得到dblink的一些解释
1、dblink执行有两种方式,一种是在远处数据库执行完,然后结果返回,另一种是把远程的表下载到本来,然后执行
2、如果把远程的表下载到本地,空值或者null可能会发生变化(怀疑是空值转化为null,未证实)
三、根据这些解释,进行猜想
1、只执行select的时候,应该是在远程执行完,传输结果回来;而执行insert into的时候,是把远程的表全部下载到本地,然后执行出结果,而数据量本身比较大,所以比较慢
2、在把表从远程下载到本地的过程中,fail_reason 列的null值可以发生了变化,或者空值变为了null,所以数据多了4条
四、事实证明猜想
1、查询远程表大小,发现a表50m,b表400m,c表10m,d表100m左右,传输过来需要一定的时间
2、既然猜测是由于要把表传输到本地而导致这样的结果产生,那么处理方法就是让程序在远程计算出结果,然后传输到本地,查询了一些资料,上面说insert into会导致driving_site提示无效,那么我想到一个用视图的办法解决这个问题:在目标端建立一个关于本查询中无参数的视图,然后在本地通过dblink调用视图,这样总该先在远程执行出结果传输到本地了吧。
2.1)建立目标端视图
create or replace view v_tab select c.user_logon,/*工号*/c.user_name,/*姓名*/a.call_id,/*通话id*/ a.caller_nbr,/*主叫号码*/a.called_nbr,/*被叫号码*/d.start_time,/*呼入时间*/ b.call_time,/*接听时间*/b.end_time,/*结束时间*/b.call_dura,/*时长*/ to_number(b.call_time-d.start_time)*24*3600,/*等待时长*/ decode(c.user_logon,null,0,1),/*类型*/ case when substr (a.CALLED_NBR,7, 2) = '00' then '广东移动' when substr (a.CALLED_NBR,7, 2) = '01' then '浙江移动' when substr (a.CALLED_NBR,7, 2) = '02' then '福建' when substr (a.CALLED_NBR,7, 2) = '03' then '四川' when substr (a.CALLED_NBR,7, 2) = '04' then '河南' when substr (a.CALLED_NBR,7, 2) = '05' then '湖北' when substr (a.CALLED_NBR,7, 2) = '06' then '北京CSIP' when substr (a.CALLED_NBR,7, 2) = '07' then '陕西' when substr (a.CALLED_NBR,7, 2) = '08' then '吉林' when substr (a.CALLED_NBR,7, 2) = '09' then '江西' when substr (a.CALLED_NBR,7, 2) = '10' then '宁夏' when substr (a.CALLED_NBR,7, 2) = '11' then '太原' when substr (a.CALLED_NBR,7, 2) = '12' then '江苏移动' when substr (a.CALLED_NBR,7, 2) = '13' then 'e掌管' when substr (a.CALLED_NBR,7, 2) = '15' then 'e多商' when substr (a.CALLED_NBR,7, 2) = '18' then '江苏联通' end 区域 from cscnew.a a,cscnew.b b,cscnew.c c,cscnew.d d where a.call_serial=b.call_serial(+) and b.call_serial=d.call_serial(+) and b.user_id=c.user_id(+) and substr(a.CALLED_NBR,1, 6) = '951654' and length (a.CALLED_NBR) = 15 and b.fail_reason is null
2.2)本地调用远程视图
INSERT INTO TAB_CS_CALLLOG select * from v_tab@cs a where a.end_time>=to_date('20110822000000','yyyymmddhh24miss') and a.end_time<to_date('20110823000000','yyyymmddhh24miss');
2.3)执行结果2.3S完成数据插入,而且条数也是598条,证明我的猜想是正确的,更重要的是解决了今天这个让人疑惑的问题
undo异常处理步骤(10g)
1、启动数据库,发现错误
startup
2、查看是否是undo文件损坏引起
select a.ts#,a.name,b.name from v$datafile a,v$tablespace b where a.ts#=b.ts#;
3、损坏undo离线
alter database datafile n offline drop;
4、打开数据库
alter database open;
5、查看当前undo表空间,并确认是否是当前undo损坏,如果不是当前undo,直接执行8,否则继续
show parameter undo_tablespace;
6、创建新undo表空间
CREATE UNDO TABLESPACE UNDOTBSNEW DATAFILE
‘/opt/oracle/oradata/xifenfei/UNDOTBS01.dbf
SIZE 50M autoextend on next 10m maxsize 30G;
7、修改默认undo为新创建表空间
alter system set undo_tablespace=’UNDOTBSNEW’;
8、查询回滚段信息,为下面删除损坏undo的回滚段做到心中有底
select segment_name,status from dba_rollback_segs;
9、删除损坏undo,如果报ORA-01548错误,继续下面操作,否则跳到14
drop tablespace UNDOTBSOLD including contents and datafiles;
10、创建pfile文件
create pfile=’/tmp/pfile’ from spfile;
11、修改pfile文件,添加隐含参数
*._allow_resetlogs_corruption=true
*._corrupted_rollback_segments=(_SYSSMU1$,_SYSSMU2$,_SYSSMU3$,_SYSSMU4$,_SYSSMU5$,
_SYSSMU6$,_SYSSMU7$,_SYSSMU8$,_SYSSMU9$,_SYSSMU10$)
12、使用pfile启动数据库
startup pfile=’/tmp/pfile’
13、删除损坏undo
drop tablespace UNDOTBSOLD including contents and datafiles;
14、查看回滚段状态
select segment_name,status from dba_rollback_segs;
15、如果有损坏表空间回滚段还存在,手工删除
drop rollback segment “_SYSSMUx$”;
16、重启数据库
shutdown immediate
startup
Linux修改系统时间
我们一般使用’date -s’命令来修改系统时间。比如将系统时间设定成2011年8月24日的命令如下。
#date -s 08/24/2011
将系统时间设定成下午23点0分20秒的命令如下。
#date -s 23:00:20
注意,这里说的是系统时间,是linux由操作系统维护的。
在系统启动时,Linux操作系统将时间从CMOS中读到系统时间变量中,以后修改时间通过修改系统时间实现。为了保持系统时间与CMOS时间的一致性,Linux每隔一段时间会将系统时间写入CMOS。由于该同步是每隔一段时间(大约是11分钟)进行的,在我们执行date -s后,如果马上重起机器,修改时间就有可能没有被写入CMOS,这就是问题的原因。如果要确保修改生效可以执行如下命令。
#clock -w
这个命令强制把系统时间写入CMOS。
当前联机日志损坏恢复
环境模拟
删除状态为active的联机日志,然后强行关闭数据库
处理过程
SQL> startup
ORACLE instance started.
Total System Global Area 167772160 bytes
Fixed Size 1260720 bytes
Variable Size 142607184 bytes
Database Buffers 16777216 bytes
Redo Buffers 7127040 bytes
Database mounted.
ORA-00313: open failed for members of log group 1 of thread 1
ORA-00312: online log 1 thread 1: ‘/u01/oradata/xienfei/redo01.log’
ORA-27037: unable to obtain file status
Linux Error: 2: No such file or directory
Additional information: 3
Alert.log 日志中错误
Wed Aug 24 00:26:33 2011
Errors in file /u01/admin/xienfei/udump/xff_ora_9186.trc:
ORA-00313: open failed for members of log group 1 of thread 1
ORA-00312: online log 1 thread 1: ‘/u01/oradata/xienfei/redo01.log’
ORA-27037: unable to obtain file status
Linux Error: 2: No such file or directory
Additional information: 3
xff_ora_9186.trc文件中错误
ORA-00313: open failed for members of log group 1 of thread 1
ORA-00312: online log 1 thread 1: ‘/u01/oradata/xienfei/redo01.log’
ORA-27037: unable to obtain file status
Linux Error: 2: No such file or directory
Additional information: 3
查询当前日志组状态
SQL> select a.group#,a.status,b.member from v$log a,v$logfile b where a.group#=b.group#;
GROUP# STATUS MEMBER
———- —————- ———————————————
1 CURRENT /u01/oradata/xienfei/redo01.log
3 INACTIVE /u01/oradata/xienfei/redo03.log
2 ACTIVE /u01/oradata/xienfei/redo02.log
尝试删除redo日志
SQL> alter database drop logfile group 1;
alter database drop logfile group 1
*
ERROR at line 1:
ORA-01623: log 1 is current log for instance xff (thread 1) – cannot drop
ORA-00312: online log 1 thread 1: ‘/u01/oradata/xienfei/redo01.log’
发现是当前日志不能被删除,尝试切换日志
SQL> alter system switch logfile;
alter system switch logfile
*
ERROR at line 1:
ORA-01109: database not open
在数据库未打开状态,不能切换日志,只能尝试清空日志
SQL> alter database clear unarchived logfile group 1;
alter database clear unarchived logfile group 1
*
ERROR at line 1:
ORA-01624: log 1 needed for crash recovery of instance xff (thread 1)
ORA-00312: online log 1 thread 1: ‘/u01/oradata/xienfei/redo01.log’
因为数据库恢复需要使用,不能被清空,尝试不完成恢复
SQL> recover database until cancel;
ORA-00279: change 1272687 generated at 08/24/2011 00:20:05 needed for thread 1
ORA-00289: suggestion : /u01/archive/1_27_756841839.arc
ORA-00280: change 1272687 for thread 1 is in sequence #27
Specify log: {
auto
ORA-00279: change 1272903 generated at 08/24/2011 00:25:17 needed for thread 1
ORA-00289: suggestion : /u01/archive/1_28_756841839.arc
ORA-00280: change 1272903 for thread 1 is in sequence #28
ORA-00278: log file ‘/u01/archive/1_27_756841839.arc’ no longer needed for this
recovery
ORA-00308: cannot open archived log ‘/u01/archive/1_28_756841839.arc’
ORA-27037: unable to obtain file status
Linux Error: 2: No such file or directory
Additional information: 3
ORA-01547: warning: RECOVER succeeded but OPEN RESETLOGS would get error below
ORA-01194: file 1 needs more recovery to be consistent
ORA-01110: data file 1: ‘/u01/oradata/xienfei/system01.dbf’
已经提示数据不一致,尝试着打开数据库
SQL> alter database open resetlogs;
alter database open resetlogs
*
ERROR at line 1:
ORA-01194: file 1 needs more recovery to be consistent
ORA-01110: data file 1: ‘/u01/oradata/xienfei/system01.dbf’
创建pfile文件,添加隐含参数,使之不进行检查点一致性校验
SQL> create pfile=’/tmp/pfile’ from spfile;
File created.
修改pfile ,添加以下参数
*._allow_resetlogs_corruption=TRUE
*._allow_error_simulation=TRUE
SQL> shutdown abort
ORACLE instance shut down.
使用pfile打开数据库
SQL> startup pfile=’/tmp/pfile’
ORACLE instance started.
Total System Global Area 167772160 bytes
Fixed Size 1260720 bytes
Variable Size 150995792 bytes
Database Buffers 8388608 bytes
Redo Buffers 7127040 bytes
Database mounted.
ORA-38760: This database instance failed to turn on flashback database
发现flashback导致数据库不能被正常打开,尝试关闭它
SQL> alter database flashback off;
Database altered.
尝试直接open数据库
SQL> alter database open;
alter database open
*
ERROR at line 1:
ORA-01589: must use RESETLOGS or NORESETLOGS option for database open
根据提示,使用resetlogs打开数据库
SQL> alter database open resetlogs;
Database altered.
查询日志状态
SQL> select a.group#,a.status,b.member from v$log a,v$logfile b where a.group#=b.group#;
GROUP# STATUS MEMBER
———- —————- ———————————————
3 UNUSED /u01/oradata/xienfei/redo03.log
2 UNUSED /u01/oradata/xienfei/redo02.log
1 CURRENT /u01/oradata/xienfei/redo01.log
因为group1错误,而当前日志组在group 1上,所以切换日志组
SQL> alter system switch logfile;
System altered.
SQL> select a.group#,a.status,b.member from v$log a,v$logfile b where a.group#=b.group#;
GROUP# STATUS MEMBER
———- —————- ———————————————
3 UNUSED /u01/oradata/xienfei/redo03.log
2 CURRENT /u01/oradata/xienfei/redo02.log
1 ACTIVE /u01/oradata/xienfei/redo01.log
SQL> alter system checkpoint;
System altered.
SQL> select a.group#,a.status,b.member from v$log a,v$logfile b where a.group#=b.group#;
GROUP# STATUS MEMBER
———- —————- ———————————————
3 UNUSED /u01/oradata/xienfei/redo03.log
2 CURRENT /u01/oradata/xienfei/redo02.log
1 INACTIVE /u01/oradata/xienfei/redo01.log
删除有问题的group 1日志组
SQL> alter database drop logfile group 1;
Database altered.
SQL> alter system switch logfile;
System altered.
添加日志组并检查是否正确
SQL> select a.group#,a.status,b.member from v$log a,v$logfile b where a.group#=b.group#;
GROUP# STATUS MEMBER
———- —————- ———————————————
3 CURRENT /u01/oradata/xienfei/redo03.log
2 ACTIVE /u01/oradata/xienfei/redo02.log
SQL> alter database add logfile group 1 ‘/u01/oradata/xienfei/redo01.log’ size 50m reuse;
Database altered.
SQL> alter system switch logfile;
System altered.
SQL> select a.group#,a.status,b.member from v$log a,v$logfile b where a.group#=b.group#;
GROUP# STATUS MEMBER
———- —————- ———————————————
3 ACTIVE /u01/oradata/xienfei/redo03.log
2 ACTIVE /u01/oradata/xienfei/redo02.log
1 CURRENT /u01/oradata/xienfei/redo01.log
注意:根据oracle官方建议,使用oracle隐含参数运行数据库可能存在很多不稳定因素,建议立即导出数据库数据,然后新建库,重新导入数据