一 环境:
oracle版本:10.2.0.1.0
当前undo表空间:
SQL> show parameter undo;
oracle版本:10.2.0.1.0
当前undo表空间:
SQL> show parameter undo;
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
undo_management string AUTO
undo_retention integer 900
undo_tablespace string UNDOTBS4
当前系统内的还原表空间:
SQL> select tablespace_name,status from dba_tablespaces where tablespace_name like '%UNDO%';
------------------------------------ ----------- ------------------------------
undo_management string AUTO
undo_retention integer 900
undo_tablespace string UNDOTBS4
当前系统内的还原表空间:
SQL> select tablespace_name,status from dba_tablespaces where tablespace_name like '%UNDO%';
TABLESPACE_NAME STATUS
------------------------------ ---------
UNDOTBS4 ONLINE
当前undo表空间undotbs4的所有回滚段状况如下:
SQL> select * from v$rollname; (查询当前系统活动回滚段)
------------------------------ ---------
UNDOTBS4 ONLINE
当前undo表空间undotbs4的所有回滚段状况如下:
SQL> select * from v$rollname; (查询当前系统活动回滚段)
USN NAME
---------- ----------------------------------------
0 SYSTEM
1 _SYSSMU1$
2 _SYSSMU2$
3 _SYSSMU3$
4 _SYSSMU4$
5 _SYSSMU5$
6 _SYSSMU6$
7 _SYSSMU7$
8 _SYSSMU8$
9 _SYSSMU9$
11 _SYSSMU11$
---------- ----------------------------------------
0 SYSTEM
1 _SYSSMU1$
2 _SYSSMU2$
3 _SYSSMU3$
4 _SYSSMU4$
5 _SYSSMU5$
6 _SYSSMU6$
7 _SYSSMU7$
8 _SYSSMU8$
9 _SYSSMU9$
11 _SYSSMU11$
11 rows selected.
SQL> select segment_id,segment_name,tablespace_name,status from dba_rollback_segs;(
查询系统内所有回滚段信息)
SEGMENT_ID SEGMENT_NAME TABLESPACE_NAME STATUS
---------- ------------------------------ ------------------------------ ----------------
0 SYSTEM SYSTEM ONLINE
1 _SYSSMU1$ UNDOTBS4 ONLINE
2 _SYSSMU2$ UNDOTBS4 ONLINE
3 _SYSSMU3$ UNDOTBS4 ONLINE
4 _SYSSMU4$ UNDOTBS4 ONLINE
5 _SYSSMU5$ UNDOTBS4 ONLINE
6 _SYSSMU6$ UNDOTBS4 ONLINE
7 _SYSSMU7$ UNDOTBS4 ONLINE
8 _SYSSMU8$ UNDOTBS4 ONLINE
9 _SYSSMU9$ UNDOTBS4 ONLINE
11 _SYSSMU11$ UNDOTBS4 ONLINE
---------- ------------------------------ ------------------------------ ----------------
0 SYSTEM SYSTEM ONLINE
1 _SYSSMU1$ UNDOTBS4 ONLINE
2 _SYSSMU2$ UNDOTBS4 ONLINE
3 _SYSSMU3$ UNDOTBS4 ONLINE
4 _SYSSMU4$ UNDOTBS4 ONLINE
5 _SYSSMU5$ UNDOTBS4 ONLINE
6 _SYSSMU6$ UNDOTBS4 ONLINE
7 _SYSSMU7$ UNDOTBS4 ONLINE
8 _SYSSMU8$ UNDOTBS4 ONLINE
9 _SYSSMU9$ UNDOTBS4 ONLINE
11 _SYSSMU11$ UNDOTBS4 ONLINE
11 rows selected.
SQL>
二 测试
当系统有一个还原表空间undotbs4
测试1 undo_management=auto ,用参数*._offline_rollback_segments和*._corrupted_rollback_segments标记当前undo表空间undotbs4的所有段,查询当前oracle所有活动回滚段。
测试2 undo_management=manual ,用参数*._offline_rollback_segments和*._corrupted_rollback_segments标记当前undo表空间undotbs4的所有段,查询当前oracle所有活动回滚段。
当系统有多个还原表空间,undotbs4、undotbs3、undotbs2、undotbs1
测试3 undo_management=auto ,用参数*._offline_rollback_segments和*._corrupted_rollback_segments标记当前undo表空间undotbs4的所有段,查询当前oracle所有活动回滚段。
测试4 undo_management=manual, 用参数*._offline_rollback_segments和*._corrupted_rollback_segments标记当前undo表空间undotbs4的所有段,查询当前oracle所有活动回滚段。
二 测试
当系统有一个还原表空间undotbs4
测试1 undo_management=auto ,用参数*._offline_rollback_segments和*._corrupted_rollback_segments标记当前undo表空间undotbs4的所有段,查询当前oracle所有活动回滚段。
测试2 undo_management=manual ,用参数*._offline_rollback_segments和*._corrupted_rollback_segments标记当前undo表空间undotbs4的所有段,查询当前oracle所有活动回滚段。
当系统有多个还原表空间,undotbs4、undotbs3、undotbs2、undotbs1
测试3 undo_management=auto ,用参数*._offline_rollback_segments和*._corrupted_rollback_segments标记当前undo表空间undotbs4的所有段,查询当前oracle所有活动回滚段。
测试4 undo_management=manual, 用参数*._offline_rollback_segments和*._corrupted_rollback_segments标记当前undo表空间undotbs4的所有段,查询当前oracle所有活动回滚段。
三实验过程
当系统仅有一个还原表空间undotbs4
测试1:
initCRM.ora 内容如下:
*.undo_management='AUTO'
*.undo_tablespace='UNDOTBS4'
*.user_dump_dest='/oracle/app/admin/CRM/udump'
*._offline_rollback_segments='_SYSSMU1$','_SYSSMU2$','_SYSSMU3$','_SYSSMU4$','_SYSSMU5$','_SYSSMU6$','_SYSSMU7$','_SYSSMU8$','_SYSSMU9$','_SYSSMU11$'
*._corrupted_rollback_segments='_SYSSMU1$','_SYSSMU2$','_SYSSMU3$','_SYSSMU4$','_SYSSMU5$','_SYSSMU6$','_SYSSMU7$','_SYSSMU8$','_SYSSMU9$','_SYSSMU11$'
当系统仅有一个还原表空间undotbs4
测试1:
initCRM.ora 内容如下:
*.undo_management='AUTO'
*.undo_tablespace='UNDOTBS4'
*.user_dump_dest='/oracle/app/admin/CRM/udump'
*._offline_rollback_segments='_SYSSMU1$','_SYSSMU2$','_SYSSMU3$','_SYSSMU4$','_SYSSMU5$','_SYSSMU6$','_SYSSMU7$','_SYSSMU8$','_SYSSMU9$','_SYSSMU11$'
*._corrupted_rollback_segments='_SYSSMU1$','_SYSSMU2$','_SYSSMU3$','_SYSSMU4$','_SYSSMU5$','_SYSSMU6$','_SYSSMU7$','_SYSSMU8$','_SYSSMU9$','_SYSSMU11$'
oracle启动过程如下:
SQL> startup pfile='/oracle/app/db1/dbs/initCRM.ora';
ORACLE instance started.
Total System Global Area 322961408 bytes
Fixed Size 2020480 bytes
Variable Size 83889024 bytes
Database Buffers 230686720 bytes
Redo Buffers 6365184 bytes
Database mounted.
ORA-01092: ORACLE instance terminated. Disconnection forced
SQL> startup pfile='/oracle/app/db1/dbs/initCRM.ora';
ORACLE instance started.
Total System Global Area 322961408 bytes
Fixed Size 2020480 bytes
Variable Size 83889024 bytes
Database Buffers 230686720 bytes
Redo Buffers 6365184 bytes
Database mounted.
ORA-01092: ORACLE instance terminated. Disconnection forced
告警文件错误信息如下:
Errors in file /oracle/app/admin/CRM/udump/crm_ora_9154.trc:
ORA-30012: undo tablespace 'UNDOTBS4' does not exist or of wrong type
Tue Nov 13 22:13:15 2012
Error 30012 happened during db open, shutting down database
USER: terminating instance due to error 30012
Instance terminated by USER, pid = 9154
ORA-1092 signalled during: ALTER DATABASE OPEN...
总结:库都启动不了,回滚段信息就不要看了。
-------------------------------------------------------------------------------
测试2:
initCRM.ora 内容如下:
*.undo_management='MANUAL'
*.undo_tablespace='UNDOTBS4'
*.user_dump_dest='/oracle/app/admin/CRM/udump'
*._offline_rollback_segments='_SYSSMU1$','_SYSSMU2$','_SYSSMU3$','_SYSSMU4$','_SYSSMU5$','_SYSSMU6$','_SYSSMU7$','_SYSSMU8$','_SYSSMU9$','_SYSSMU11$'
*._corrupted_rollback_segments='_SYSSMU1$','_SYSSMU2$','_SYSSMU3$','_SYSSMU4$','_SYSSMU5$','_SYSSMU6$','_SYSSMU7$','_SYSSMU8$','_SYSSMU9$','_SYSSMU11$'
Errors in file /oracle/app/admin/CRM/udump/crm_ora_9154.trc:
ORA-30012: undo tablespace 'UNDOTBS4' does not exist or of wrong type
Tue Nov 13 22:13:15 2012
Error 30012 happened during db open, shutting down database
USER: terminating instance due to error 30012
Instance terminated by USER, pid = 9154
ORA-1092 signalled during: ALTER DATABASE OPEN...
总结:库都启动不了,回滚段信息就不要看了。
-------------------------------------------------------------------------------
测试2:
initCRM.ora 内容如下:
*.undo_management='MANUAL'
*.undo_tablespace='UNDOTBS4'
*.user_dump_dest='/oracle/app/admin/CRM/udump'
*._offline_rollback_segments='_SYSSMU1$','_SYSSMU2$','_SYSSMU3$','_SYSSMU4$','_SYSSMU5$','_SYSSMU6$','_SYSSMU7$','_SYSSMU8$','_SYSSMU9$','_SYSSMU11$'
*._corrupted_rollback_segments='_SYSSMU1$','_SYSSMU2$','_SYSSMU3$','_SYSSMU4$','_SYSSMU5$','_SYSSMU6$','_SYSSMU7$','_SYSSMU8$','_SYSSMU9$','_SYSSMU11$'
oracle启动过程如下:
SQL> startup pfile='/oracle/app/db1/dbs/initCRM.ora';
ORACLE instance started.
Total System Global Area 322961408 bytes
Fixed Size 2020480 bytes
Variable Size 83889024 bytes
Database Buffers 230686720 bytes
Redo Buffers 6365184 bytes
Database mounted.
Database opened.
SQL> startup pfile='/oracle/app/db1/dbs/initCRM.ora';
ORACLE instance started.
Total System Global Area 322961408 bytes
Fixed Size 2020480 bytes
Variable Size 83889024 bytes
Database Buffers 230686720 bytes
Redo Buffers 6365184 bytes
Database mounted.
Database opened.
当前oracle所有活动回滚段状态如下:
select segment_id,segment_name,tablespace_name,status from dba_rollback_segs
select segment_id,segment_name,tablespace_name,status from dba_rollback_segs
SEGMENT_ID SEGMENT_NAME TABLESPACE_NAME STATUS
---------- ------------------------------ ------------------------------ ----------------
0 SYSTEM SYSTEM ONLINE
1 _SYSSMU1$ UNDOTBS4 OFFLINE
2 _SYSSMU2$ UNDOTBS4 OFFLINE
3 _SYSSMU3$ UNDOTBS4 OFFLINE
4 _SYSSMU4$ UNDOTBS4 OFFLINE
5 _SYSSMU5$ UNDOTBS4 OFFLINE
6 _SYSSMU6$ UNDOTBS4 OFFLINE
7 _SYSSMU7$ UNDOTBS4 OFFLINE
8 _SYSSMU8$ UNDOTBS4 OFFLINE
9 _SYSSMU9$ UNDOTBS4 OFFLINE
11 _SYSSMU11$ UNDOTBS4 OFFLINE
---------- ------------------------------ ------------------------------ ----------------
0 SYSTEM SYSTEM ONLINE
1 _SYSSMU1$ UNDOTBS4 OFFLINE
2 _SYSSMU2$ UNDOTBS4 OFFLINE
3 _SYSSMU3$ UNDOTBS4 OFFLINE
4 _SYSSMU4$ UNDOTBS4 OFFLINE
5 _SYSSMU5$ UNDOTBS4 OFFLINE
6 _SYSSMU6$ UNDOTBS4 OFFLINE
7 _SYSSMU7$ UNDOTBS4 OFFLINE
8 _SYSSMU8$ UNDOTBS4 OFFLINE
9 _SYSSMU9$ UNDOTBS4 OFFLINE
11 _SYSSMU11$ UNDOTBS4 OFFLINE
11 rows selected.
SQL> select * from v$rollname;
USN NAME
---------- ------------------------------
0 SYSTEM
---------- ------------------------------
0 SYSTEM
当系统有多个还原表空间时进行如下测试:
SQL> select tablespace_name,status from dba_tablespaces where tablespace_name like '%UNDO%';
SQL> select tablespace_name,status from dba_tablespaces where tablespace_name like '%UNDO%';
TABLESPACE_NAME STATUS
------------------------------ ---------
UNDOTBS1 ONLINE
UNDOTBS2 ONLINE
UNDOTBS3 ONLINE
UNDOTBS4 ONLINE
SQL> show parameter undo;
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
undo_management string MANUAL
undo_retention integer 900
undo_tablespace string UNDOTBS4
----------------------------------------------------------------------------------------------------------
测试3
initCRM.ora 内容如下:
*.undo_management='AUTO'
*.undo_tablespace='UNDOTBS4'
*.user_dump_dest='/oracle/app/admin/CRM/udump'
*._corrupted_rollback_segments='_SYSSMU1$','_SYSSMU2$','_SYSSMU3$','_SYSSMU4$','_SYSSMU5$','_SYSSMU6$','_SYSSMU7$','_SYSSMU8$','_SYSSMU9$','_SYSSMU11$'
*._offline_rollback_segments='_SYSSMU1$','_SYSSMU2$','_SYSSMU3$','_SYSSMU4$','_SYSSMU5$','_SYSSMU6$','_SYSSMU7$','_SYSSMU8$','_SYSSMU9$','_SYSSMU11$'
------------------------------ ---------
UNDOTBS1 ONLINE
UNDOTBS2 ONLINE
UNDOTBS3 ONLINE
UNDOTBS4 ONLINE
SQL> show parameter undo;
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
undo_management string MANUAL
undo_retention integer 900
undo_tablespace string UNDOTBS4
----------------------------------------------------------------------------------------------------------
测试3
initCRM.ora 内容如下:
*.undo_management='AUTO'
*.undo_tablespace='UNDOTBS4'
*.user_dump_dest='/oracle/app/admin/CRM/udump'
*._corrupted_rollback_segments='_SYSSMU1$','_SYSSMU2$','_SYSSMU3$','_SYSSMU4$','_SYSSMU5$','_SYSSMU6$','_SYSSMU7$','_SYSSMU8$','_SYSSMU9$','_SYSSMU11$'
*._offline_rollback_segments='_SYSSMU1$','_SYSSMU2$','_SYSSMU3$','_SYSSMU4$','_SYSSMU5$','_SYSSMU6$','_SYSSMU7$','_SYSSMU8$','_SYSSMU9$','_SYSSMU11$'
oracle启动过程如下:
SQL> startup pfile='/oracle/app/db1/dbs/initCRM.ora';
ORACLE instance started.
SQL> startup pfile='/oracle/app/db1/dbs/initCRM.ora';
ORACLE instance started.
Total System Global Area 322961408 bytes
Fixed Size 2020480 bytes
Variable Size 83889024 bytes
Database Buffers 230686720 bytes
Redo Buffers 6365184 bytes
Database mounted.
Database opened.
Fixed Size 2020480 bytes
Variable Size 83889024 bytes
Database Buffers 230686720 bytes
Redo Buffers 6365184 bytes
Database mounted.
Database opened.
当前oracle所有活动回滚段状态如下:
SEGMENT_ID SEGMENT_NAME TABLESPACE_NAME STATUS
---------- ------------------------------ ------------------------------ ----------------
0 SYSTEM SYSTEM ONLINE
1 _SYSSMU1$ UNDOTBS4 OFFLINE
2 _SYSSMU2$ UNDOTBS4 OFFLINE
3 _SYSSMU3$ UNDOTBS4 OFFLINE
4 _SYSSMU4$ UNDOTBS4 OFFLINE
5 _SYSSMU5$ UNDOTBS4 OFFLINE
6 _SYSSMU6$ UNDOTBS4 OFFLINE
7 _SYSSMU7$ UNDOTBS4 OFFLINE
8 _SYSSMU8$ UNDOTBS4 OFFLINE
9 _SYSSMU9$ UNDOTBS4 OFFLINE
11 _SYSSMU11$ UNDOTBS4 OFFLINE
12 _SYSSMU12$ UNDOTBS1 OFFLINE
13 _SYSSMU13$ UNDOTBS1 OFFLINE
14 _SYSSMU14$ UNDOTBS1 OFFLINE
15 _SYSSMU15$ UNDOTBS1 OFFLINE
16 _SYSSMU16$ UNDOTBS1 OFFLINE
17 _SYSSMU17$ UNDOTBS1 OFFLINE
18 _SYSSMU18$ UNDOTBS1 OFFLINE
19 _SYSSMU19$ UNDOTBS1 OFFLINE
20 _SYSSMU20$ UNDOTBS1 OFFLINE
21 _SYSSMU21$ UNDOTBS1 OFFLINE
22 _SYSSMU22$ UNDOTBS2 OFFLINE
23 _SYSSMU23$ UNDOTBS2 OFFLINE
24 _SYSSMU24$ UNDOTBS2 OFFLINE
25 _SYSSMU25$ UNDOTBS2 OFFLINE
26 _SYSSMU26$ UNDOTBS2 OFFLINE
27 _SYSSMU27$ UNDOTBS2 OFFLINE
28 _SYSSMU28$ UNDOTBS2 OFFLINE
29 _SYSSMU29$ UNDOTBS2 OFFLINE
30 _SYSSMU30$ UNDOTBS2 OFFLINE
31 _SYSSMU31$ UNDOTBS2 OFFLINE
32 _SYSSMU32$ UNDOTBS3 OFFLINE
33 _SYSSMU33$ UNDOTBS3 OFFLINE
34 _SYSSMU34$ UNDOTBS3 OFFLINE
35 _SYSSMU35$ UNDOTBS3 OFFLINE
36 _SYSSMU36$ UNDOTBS3 OFFLINE
37 _SYSSMU37$ UNDOTBS3 OFFLINE
38 _SYSSMU38$ UNDOTBS3 OFFLINE
39 _SYSSMU39$ UNDOTBS3 OFFLINE
40 _SYSSMU40$ UNDOTBS3 OFFLINE
41 _SYSSMU41$ UNDOTBS3 OFFLINE
42 _SYSSMU42$ UNDOTBS4 ONLINE
SEGMENT_ID SEGMENT_NAME TABLESPACE_NAME STATUS
---------- ------------------------------ ------------------------------ ----------------
0 SYSTEM SYSTEM ONLINE
1 _SYSSMU1$ UNDOTBS4 OFFLINE
2 _SYSSMU2$ UNDOTBS4 OFFLINE
3 _SYSSMU3$ UNDOTBS4 OFFLINE
4 _SYSSMU4$ UNDOTBS4 OFFLINE
5 _SYSSMU5$ UNDOTBS4 OFFLINE
6 _SYSSMU6$ UNDOTBS4 OFFLINE
7 _SYSSMU7$ UNDOTBS4 OFFLINE
8 _SYSSMU8$ UNDOTBS4 OFFLINE
9 _SYSSMU9$ UNDOTBS4 OFFLINE
11 _SYSSMU11$ UNDOTBS4 OFFLINE
12 _SYSSMU12$ UNDOTBS1 OFFLINE
13 _SYSSMU13$ UNDOTBS1 OFFLINE
14 _SYSSMU14$ UNDOTBS1 OFFLINE
15 _SYSSMU15$ UNDOTBS1 OFFLINE
16 _SYSSMU16$ UNDOTBS1 OFFLINE
17 _SYSSMU17$ UNDOTBS1 OFFLINE
18 _SYSSMU18$ UNDOTBS1 OFFLINE
19 _SYSSMU19$ UNDOTBS1 OFFLINE
20 _SYSSMU20$ UNDOTBS1 OFFLINE
21 _SYSSMU21$ UNDOTBS1 OFFLINE
22 _SYSSMU22$ UNDOTBS2 OFFLINE
23 _SYSSMU23$ UNDOTBS2 OFFLINE
24 _SYSSMU24$ UNDOTBS2 OFFLINE
25 _SYSSMU25$ UNDOTBS2 OFFLINE
26 _SYSSMU26$ UNDOTBS2 OFFLINE
27 _SYSSMU27$ UNDOTBS2 OFFLINE
28 _SYSSMU28$ UNDOTBS2 OFFLINE
29 _SYSSMU29$ UNDOTBS2 OFFLINE
30 _SYSSMU30$ UNDOTBS2 OFFLINE
31 _SYSSMU31$ UNDOTBS2 OFFLINE
32 _SYSSMU32$ UNDOTBS3 OFFLINE
33 _SYSSMU33$ UNDOTBS3 OFFLINE
34 _SYSSMU34$ UNDOTBS3 OFFLINE
35 _SYSSMU35$ UNDOTBS3 OFFLINE
36 _SYSSMU36$ UNDOTBS3 OFFLINE
37 _SYSSMU37$ UNDOTBS3 OFFLINE
38 _SYSSMU38$ UNDOTBS3 OFFLINE
39 _SYSSMU39$ UNDOTBS3 OFFLINE
40 _SYSSMU40$ UNDOTBS3 OFFLINE
41 _SYSSMU41$ UNDOTBS3 OFFLINE
42 _SYSSMU42$ UNDOTBS4 ONLINE
42 rows selected.
SQL> select * from v$rollname;
USN NAME
---------- ------------------------------
0 SYSTEM
42 _SYSSMU42$
总结:事实上当我们用参数做如下设置时
*._corrupted_rollback_segments='_SYSSMU1$','_SYSSMU2$','_SYSSMU3$','_SYSSMU4$','_SYSSMU5$','_SYSSMU6$','_SYSSMU7$','_SYSSMU8$','_SYSSMU9$','_SYSSMU11$','_SYSSMU42$'
*._offline_rollback_segments='_SYSSMU1$','_SYSSMU2$','_SYSSMU3$','_SYSSMU4$','_SYSSMU5$','_SYSSMU6$','_SYSSMU7$','_SYSSMU8$','_SYSSMU9$','_SYSSMU11$','_SYSSMU42$'
启动后,oracle会产生另一个非系统回滚段_SYSSMU43$如下:
SQL> select * from v$rollname;
---------- ------------------------------
0 SYSTEM
42 _SYSSMU42$
总结:事实上当我们用参数做如下设置时
*._corrupted_rollback_segments='_SYSSMU1$','_SYSSMU2$','_SYSSMU3$','_SYSSMU4$','_SYSSMU5$','_SYSSMU6$','_SYSSMU7$','_SYSSMU8$','_SYSSMU9$','_SYSSMU11$','_SYSSMU42$'
*._offline_rollback_segments='_SYSSMU1$','_SYSSMU2$','_SYSSMU3$','_SYSSMU4$','_SYSSMU5$','_SYSSMU6$','_SYSSMU7$','_SYSSMU8$','_SYSSMU9$','_SYSSMU11$','_SYSSMU42$'
启动后,oracle会产生另一个非系统回滚段_SYSSMU43$如下:
SQL> select * from v$rollname;
USN NAME
---------- ------------------------------
0 SYSTEM
43 _SYSSMU43$
SQL> select segment_id,segment_name,tablespace_name,status from dba_rollback_segs
2 ;
---------- ------------------------------
0 SYSTEM
43 _SYSSMU43$
SQL> select segment_id,segment_name,tablespace_name,status from dba_rollback_segs
2 ;
SEGMENT_ID SEGMENT_NAME TABLESPACE_NAME STATUS
---------- ------------------------------ ------------------------------ ----------------
0 SYSTEM SYSTEM ONLINE
1 _SYSSMU1$ UNDOTBS4 OFFLINE
2 _SYSSMU2$ UNDOTBS4 OFFLINE
3 _SYSSMU3$ UNDOTBS4 OFFLINE
。。。。。。。。。。。。。。。此处省略数行。。。。。。。。。
43 _SYSSMU43$ UNDOTBS4 ONLINE
---------- ------------------------------ ------------------------------ ----------------
0 SYSTEM SYSTEM ONLINE
1 _SYSSMU1$ UNDOTBS4 OFFLINE
2 _SYSSMU2$ UNDOTBS4 OFFLINE
3 _SYSSMU3$ UNDOTBS4 OFFLINE
。。。。。。。。。。。。。。。此处省略数行。。。。。。。。。
43 _SYSSMU43$ UNDOTBS4 ONLINE
43 rows selected.
也就是说当undo_management=auto时,即使用隐含参数_corrupted_rollback_segments和_offline_rollback_segments标记当前undo表空间所有回滚段,数据库启动时oracle也总会创建一个非系统回滚段,直到undo表空间容量耗尽(猜测)
------------------------------------------------------------------------------------------------------------------------------------------------
测试4:
initCRM.ora参数如下
*.undo_management='MANUAL'
*.undo_tablespace='UNDOTBS4'
*.user_dump_dest='/oracle/app/admin/CRM/udump'
*._corrupted_rollback_segments='_SYSSMU1$','_SYSSMU2$','_SYSSMU3$','_SYSSMU4$','_SYSSMU5$','_SYSSMU6$','_SYSSMU7$','_SYSSMU8$','_SYSSMU9$','_SYSSMU11$'
*._offline_rollback_segments='_SYSSMU1$','_SYSSMU2$','_SYSSMU3$','_SYSSMU4$','_SYSSMU5$','_SYSSMU6$','_SYSSMU7$','_SYSSMU8$','_SYSSMU9$','_SYSSMU11$'
也就是说当undo_management=auto时,即使用隐含参数_corrupted_rollback_segments和_offline_rollback_segments标记当前undo表空间所有回滚段,数据库启动时oracle也总会创建一个非系统回滚段,直到undo表空间容量耗尽(猜测)
------------------------------------------------------------------------------------------------------------------------------------------------
测试4:
initCRM.ora参数如下
*.undo_management='MANUAL'
*.undo_tablespace='UNDOTBS4'
*.user_dump_dest='/oracle/app/admin/CRM/udump'
*._corrupted_rollback_segments='_SYSSMU1$','_SYSSMU2$','_SYSSMU3$','_SYSSMU4$','_SYSSMU5$','_SYSSMU6$','_SYSSMU7$','_SYSSMU8$','_SYSSMU9$','_SYSSMU11$'
*._offline_rollback_segments='_SYSSMU1$','_SYSSMU2$','_SYSSMU3$','_SYSSMU4$','_SYSSMU5$','_SYSSMU6$','_SYSSMU7$','_SYSSMU8$','_SYSSMU9$','_SYSSMU11$'
oracle启动过程如下:
SQL> startup pfile='/oracle/app/db1/dbs/initCRM.ora';
ORACLE instance started.
Total System Global Area 322961408 bytes
Fixed Size 2020480 bytes
Variable Size 83889024 bytes
Database Buffers 230686720 bytes
Redo Buffers 6365184 bytes
Database mounted.
Database opened.
SQL> startup pfile='/oracle/app/db1/dbs/initCRM.ora';
ORACLE instance started.
Total System Global Area 322961408 bytes
Fixed Size 2020480 bytes
Variable Size 83889024 bytes
Database Buffers 230686720 bytes
Redo Buffers 6365184 bytes
Database mounted.
Database opened.
当前oracle所有活动回滚段状态如下:
SQL> select segment_id,segment_name,tablespace_name,status from dba_rollback_segs;
SQL> select segment_id,segment_name,tablespace_name,status from dba_rollback_segs;
SEGMENT_ID SEGMENT_NAME TABLESPACE_NAME STATUS
---------- ------------------------------ ------------------------------ ----------------
0 SYSTEM SYSTEM ONLINE
1 _SYSSMU1$ UNDOTBS4 OFFLINE
2 _SYSSMU2$ UNDOTBS4 OFFLINE
3 _SYSSMU3$ UNDOTBS4 OFFLINE
4 _SYSSMU4$ UNDOTBS4 OFFLINE
5 _SYSSMU5$ UNDOTBS4 OFFLINE
6 _SYSSMU6$ UNDOTBS4 OFFLINE
7 _SYSSMU7$ UNDOTBS4 OFFLINE
8 _SYSSMU8$ UNDOTBS4 OFFLINE
9 _SYSSMU9$ UNDOTBS4 OFFLINE
11 _SYSSMU11$ UNDOTBS4 OFFLINE
12 _SYSSMU12$ UNDOTBS1 OFFLINE
13 _SYSSMU13$ UNDOTBS1 OFFLINE
14 _SYSSMU14$ UNDOTBS1 OFFLINE
15 _SYSSMU15$ UNDOTBS1 OFFLINE
16 _SYSSMU16$ UNDOTBS1 OFFLINE
17 _SYSSMU17$ UNDOTBS1 OFFLINE
18 _SYSSMU18$ UNDOTBS1 OFFLINE
19 _SYSSMU19$ UNDOTBS1 OFFLINE
20 _SYSSMU20$ UNDOTBS1 OFFLINE
21 _SYSSMU21$ UNDOTBS1 OFFLINE
22 _SYSSMU22$ UNDOTBS2 OFFLINE
23 _SYSSMU23$ UNDOTBS2 OFFLINE
24 _SYSSMU24$ UNDOTBS2 OFFLINE
25 _SYSSMU25$ UNDOTBS2 OFFLINE
26 _SYSSMU26$ UNDOTBS2 OFFLINE
27 _SYSSMU27$ UNDOTBS2 OFFLINE
28 _SYSSMU28$ UNDOTBS2 OFFLINE
29 _SYSSMU29$ UNDOTBS2 OFFLINE
30 _SYSSMU30$ UNDOTBS2 OFFLINE
31 _SYSSMU31$ UNDOTBS2 OFFLINE
32 _SYSSMU32$ UNDOTBS3 OFFLINE
33 _SYSSMU33$ UNDOTBS3 OFFLINE
34 _SYSSMU34$ UNDOTBS3 OFFLINE
35 _SYSSMU35$ UNDOTBS3 OFFLINE
36 _SYSSMU36$ UNDOTBS3 OFFLINE
37 _SYSSMU37$ UNDOTBS3 OFFLINE
38 _SYSSMU38$ UNDOTBS3 OFFLINE
39 _SYSSMU39$ UNDOTBS3 OFFLINE
40 _SYSSMU40$ UNDOTBS3 OFFLINE
41 _SYSSMU41$ UNDOTBS3 OFFLINE
42 _SYSSMU42$ UNDOTBS4 OFFLINE
43 _SYSSMU43$ UNDOTBS4 OFFLINE
---------- ------------------------------ ------------------------------ ----------------
0 SYSTEM SYSTEM ONLINE
1 _SYSSMU1$ UNDOTBS4 OFFLINE
2 _SYSSMU2$ UNDOTBS4 OFFLINE
3 _SYSSMU3$ UNDOTBS4 OFFLINE
4 _SYSSMU4$ UNDOTBS4 OFFLINE
5 _SYSSMU5$ UNDOTBS4 OFFLINE
6 _SYSSMU6$ UNDOTBS4 OFFLINE
7 _SYSSMU7$ UNDOTBS4 OFFLINE
8 _SYSSMU8$ UNDOTBS4 OFFLINE
9 _SYSSMU9$ UNDOTBS4 OFFLINE
11 _SYSSMU11$ UNDOTBS4 OFFLINE
12 _SYSSMU12$ UNDOTBS1 OFFLINE
13 _SYSSMU13$ UNDOTBS1 OFFLINE
14 _SYSSMU14$ UNDOTBS1 OFFLINE
15 _SYSSMU15$ UNDOTBS1 OFFLINE
16 _SYSSMU16$ UNDOTBS1 OFFLINE
17 _SYSSMU17$ UNDOTBS1 OFFLINE
18 _SYSSMU18$ UNDOTBS1 OFFLINE
19 _SYSSMU19$ UNDOTBS1 OFFLINE
20 _SYSSMU20$ UNDOTBS1 OFFLINE
21 _SYSSMU21$ UNDOTBS1 OFFLINE
22 _SYSSMU22$ UNDOTBS2 OFFLINE
23 _SYSSMU23$ UNDOTBS2 OFFLINE
24 _SYSSMU24$ UNDOTBS2 OFFLINE
25 _SYSSMU25$ UNDOTBS2 OFFLINE
26 _SYSSMU26$ UNDOTBS2 OFFLINE
27 _SYSSMU27$ UNDOTBS2 OFFLINE
28 _SYSSMU28$ UNDOTBS2 OFFLINE
29 _SYSSMU29$ UNDOTBS2 OFFLINE
30 _SYSSMU30$ UNDOTBS2 OFFLINE
31 _SYSSMU31$ UNDOTBS2 OFFLINE
32 _SYSSMU32$ UNDOTBS3 OFFLINE
33 _SYSSMU33$ UNDOTBS3 OFFLINE
34 _SYSSMU34$ UNDOTBS3 OFFLINE
35 _SYSSMU35$ UNDOTBS3 OFFLINE
36 _SYSSMU36$ UNDOTBS3 OFFLINE
37 _SYSSMU37$ UNDOTBS3 OFFLINE
38 _SYSSMU38$ UNDOTBS3 OFFLINE
39 _SYSSMU39$ UNDOTBS3 OFFLINE
40 _SYSSMU40$ UNDOTBS3 OFFLINE
41 _SYSSMU41$ UNDOTBS3 OFFLINE
42 _SYSSMU42$ UNDOTBS4 OFFLINE
43 _SYSSMU43$ UNDOTBS4 OFFLINE
43 rows selected.
SQL> select * from v$rollname;
USN NAME
---------- ------------------------------
0 SYSTEM
实验完毕
总结如下:当我们用隐含参数_offline_rollback_segments、_corrupted_rollback_segments处理回滚段某些问题的时候,undo_management=manual为好。
---------- ------------------------------
0 SYSTEM
实验完毕
总结如下:当我们用隐含参数_offline_rollback_segments、_corrupted_rollback_segments处理回滚段某些问题的时候,undo_management=manual为好。