cdb数据库强起流程

环境模拟

因为手头没有19.3的环境，用了一个centos 7.9下的18.3的cdb环境,开启了归档

在pdb中创建表，模拟构造数据

然后删除redo log来模拟损坏

模拟插入的过程，及错误时的报错

SQL> create table t(x int); Table created. SQL> begin for i in 1..1000000 loop insert into t values(i); commit; end loop; end;  2    3    4    5    6    7  / ^Cbegin * ERROR at line 1: ORA-12152: TNS:unable to send break message

大致流程

1. 配置参数、事件启动
2. Alter database open [resetlogs];+alter database recover usning bakcup controlfle;
3. Undo使用manual
4. 处理undo表空间
5. 其他强起的伴生问题处理

针对性错误

ORA-00313

SQL> startup ORACLE instance started. Total System Global Area 1593835440 bytes Fixed Size                  8896432 bytes Variable Size             956301312 bytes Database Buffers          620756992 bytes Redo Buffers                7880704 bytes Database mounted. ORA-00313: open failed for members of log group 2 of thread 1 ORA-00312: online log 2 thread 1: '/opt/oracle/oradata/ORCLCDB/redo02.log' ORA-27037: unable to obtain file status Linux-x86_64 Error: 2: No such file or directory Additional information: 7

解决办法

*._allow_resetlogs_corruption=true

create pfile from spfile; vi /opt/oracle/product/18c/dbhome_1/dbs/initORCLCDB.ora *._allow_resetlogs_corruption=true startup mount pfile='/opt/oracle/product/18c/dbhome_1/dbs/initORCLCDB.ora'

ORA-00600: [kcbzib_kcrsds_1]

SQL> alter database open resetlogs; alter database open resetlogs * ERROR at line 1: ORA-00603: ORACLE server session terminated by fatal error ORA-01092: ORACLE instance terminated. Disconnection forced ORA-00704: bootstrap process failure ORA-00704: bootstrap process failure ORA-00600: internal error code, arguments: [kcbzib_kcrsds_1], [], [], [], [], [], [], [], [], [], [], [] Process ID: 5529 Session ID: 237 Serial number: 37189

解决办法  

’ *.event='21307096 trace name context forever, level 3'

vi /opt/oracle/product/18c/dbhome_1/dbs/initORCLCDB.ora *._allow_resetlogs_corruption=true *.event='21307096 trace name context forever, level 3'

ORA-00600: [4194]

【4193】【4194】【4197】都是同类undo问题

SQL> alter database open ; alter database open * ERROR at line 1: ORA-00603: ORACLE server session terminated by fatal error ORA-01092: ORACLE instance terminated. Disconnection forced ORA-00600: internal error code, arguments: [4194], [13], [16], [], [], [], [], [], [], [], [], [] Process ID: 6121 Session ID: 237 Serial number: 52596

解决办法

*.undo_management=manual

vi /opt/oracle/product/18c/dbhome_1/dbs/initORCLCDB.ora *._allow_resetlogs_corruption=true *.event='21307096 trace name context forever, level 3' *.undo_management=manual

后续收尾

重建undotbs

SQL> startup mount pfile='/opt/oracle/product/18c/dbhome_1/dbs/initORCLCDB.ora'; ORACLE instance started. Total System Global Area 1593835440 bytes Fixed Size                  8896432 bytes Variable Size             956301312 bytes Database Buffers          620756992 bytes Redo Buffers                7880704 bytes Database mounted. SQL> alter database open; SQL> show pdbs;     CON_ID CON_NAME                       OPEN MODE  RESTRICTED ---------- ------------------------------ ---------- ----------          2 PDB$SEED                       READ ONLY  NO          3 ORCLPDB1                       MOUNTED          4 TEST                           MOUNTED Database altered. SQL> alter pluggable database test open; Pluggable database altered. SQL> alter session set container=test; Session altered. SQL> select * from t; select * from t               * ERROR at line 1: ORA-00942: table or view does not exist

表t完全丢失了

检查undo段情况，这次模拟运气不好，没有损坏的undo段，这种时候直接替换undotbs就可以了

SQL> select SEGMENT_ID,SEGMENT_NAME,STATUS,TABLESPACE_NAME from dba_rollback_segs where status not in('ONLINE','OFFLINE'); no rows selected SQL> SQL> SQL> select KTUXEUSN,KTUXESLT,KTUXESTA,KTUXECFL,KTUXESIZ from x$ktuxe where KTUXESTA='ACTIVE' and KTUXECFL='DEAD'; no rows selected SQL> drop tablespace UNDOTBS1; Tablespace dropped. SQL> create undo tablespace UNDOTBS1 datafile '/opt/oracle/oradata/ORCLCDB/undotbs1.dbf' size 1g autoextend on; Tablespace created.

如果有undo段损坏，使用参数

*._corrupted_rollback_segments=(_SYSSMU4_xxxxxxx$)

重启，然后舍弃undotbs1,再重建

伴生的错误ORA-00600:[kdsgrp1]

Alert日志中，关闭sqlplus时会出现

ORA-00600: internal error code, arguments: [kdsgrp1], [], [], [], [], [], [], [], [], [], [], [] ORA-06512: at "SYS.DBMS_SPD_INTERNAL", line 134 ORA-06512: at "SYS.DBMS_SPD", line 257 ORA-06512: at "SYS.DBMS_SPD", line 333 ORA-06512: at line 1

排查完是sys.COL_USAGE$有损坏。影响不大。正常流程这个应该是将强起的库导出再重建。毕竟内置的很多表损坏不可知。

总结

流程上11g的强起区别不大，ora600[2662]、[2663]变成[kcbzib_kcrsds_1]，本质还是一致性问题，还是需要推scn。

核心事件

event=21307096 这个事件包含整个12c的生命周期了。从12.1-19都能用。

参考：

Force Open Database after applying Patch 21307096 (Doc ID 2674196.1)

Step by step to resolve ORA-600 4194 4193 4197 on database crash (Doc ID 1428786.1)