OCM_Session8_3_Role Transitions Involving Physical Standby Databases
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时间：2015年06月12日
在上一章节已经测试过物理备库是否在应用归档日志，在这一章节中再次验证主库创建的表空间是否应用到备库。
- 1.首先创建一个表空间。
SYS@PROD>create tablespace swtich_tbs datafile ‘/u01/app/oracle/oradata/PROD/Disk1/swtich_tbs01.dbf‘ size 10m;
Tablespace created.
##################################################################################################
tail -f alert_PROD.log
ue Mar 25 12:25:44 2014
create tablespace swtich_tbs datafile ‘/u01/app/oracle/oradata/PROD/Disk1/swtich_tbs01.dbf‘ size 10m
Tue Mar 25 12:25:47 2014
Completed: create tablespace swtich_tbs datafile ‘/u01/app/oracle/oradata/PROD/Disk1/swtich_tbs01.dbf‘ size 10m
##################################################################################################
- 2.手动归档，让日志同步。
SYS@PROD>alter system archive log current;
System altered.
##################################################################################################
tail -f alert_PROD.log
LNS1 started with pid=54, OS id=9623
Tue Mar 25 12:26:37 2014
Thread 1 advanced to log sequence 18
Current log# 5 seq# 18 mem# 0: /u01/app/oracle/oradata/PROD/Disk1/redo05.log
Current log# 5 seq# 18 mem# 1: /u01/app/oracle/oradata/PROD/Disk2/redo05_1.log
Tue Mar 25 12:26:38 2014
LNS: Standby redo logfile selected for thread 1 sequence 18 for destination LOG_ARCHIVE_DEST_2
Tue Mar 25 12:27:08 2014
ARC8: Standby redo logfile selected for thread 1 sequence 17 for destination LOG_ARCHIVE_DEST_2
tail -f alert_PRODSTD.log
Tue Mar 25 12:26:30 2014
RFS[4]: Possible network disconnect with primary database
Redo Shipping Client Connected as PUBLIC
-- Connected User is Valid
RFS[5]: Assigned to RFS process 4505
RFS[5]: Identified database type as ‘physical standby‘
Primary database is in MAXIMUM PERFORMANCE mode
Primary database is in MAXIMUM PERFORMANCE mode
RFS[5]: Successfully opened standby log 7: ‘/u01/app/oracle/oradata/PRODSTD/Disk1/standby07.log‘
Tue Mar 25 12:26:42 2014
Fetching gap sequence in thread 1, gap sequence 17-17
Tue Mar 25 12:27:08 2014
Redo Shipping Client Connected as PUBLIC
-- Connected User is Valid
RFS[6]: Assigned to RFS process 4508
RFS[6]: Identified database type as ‘physical standby‘
RFS[6]: Successfully opened standby log 6: ‘/u01/app/oracle/oradata/PRODSTD/Disk1/standby06.log‘
Tue Mar 25 12:27:13 2014
Media Recovery Log /u01/app/oracle/oradata/PRODSTD/Disk2/arch/1_17_842523531.arc
Successfully added datafile 5 to media recovery
Datafile #5: ‘/u01/app/oracle/oradata/PRODSTD/Disk1/PRODSTD/datafile/o1_mf_swtich_t_9m21f1f0_.dbf‘
Media Recovery Waiting for thread 1 sequence 18 (in transit)
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- 3.分别在主库备库中都能查到刚在主库新建的表空间。
SYS@PROD>select * from v$tablespace;
TS# NAME INC BIG FLA ENC
---------- ------------------------------ --- --- --- ---
0 SYSTEM YES NO YES
1 UNDOTBS1 YES NO YES
2 SYSAUX YES NO YES
3 TEMPTS1 NO NO YES
12 SWTICH_TBS YES NO YES
7 EXAMPLE YES YES YES
10 USERS YES NO YES
7 rows selected.
SYS@PRODSTD>select * from v$tablespace;
TS# NAME INC BIG FLA ENC
---------- ------------------------------ --- --- --- ---
0 SYSTEM YES NO YES
1 UNDOTBS1 YES NO YES
2 SYSAUX YES NO YES
3 TEMPTS1 NO NO YES
12 SWTICH_TBS YES NO YES
7 EXAMPLE YES YES YES
10 USERS YES NO YES
7 rows selected.
- 第一次切换，主库PROD与备库PRODSTD切换。
参考官方文档：7 Role Transitions-->7.2 Role Transitions Involving Physical Standby Databases
- Step 1 Verify it is possible to perform a switchover.
SYS@PROD>select database_role,switchover_status from v$database;
DATABASE_ROLE SWITCHOVER_STATUS
---------------- --------------------
PRIMARY TO STANDBY
SYS@PRODSTD>select database_role,switchover_status from v$database;
DATABASE_ROLE SWITCHOVER_STATUS
---------------- --------------------
PHYSICAL STANDBY SESSIONS ACTIVE
- Step 2 Initiate the switchover on the primary database.
SYS@PROD>ALTER DATABASE COMMIT TO SWITCHOVER TO PHYSICAL STANDBY;
Database altered.
- Step 3 Shut down and restart the former primary instance.
SYS@PROD>SHUTDOWN IMMEDIATE;
ORA-01507: database not mounted
ORACLE instance shut down.
SYS@PROD>STARTUP MOUNT;
ORACLE instance started.
Total System Global Area 524288000 bytes
Fixed Size 1220360 bytes
Variable Size 176161016 bytes
Database Buffers 343932928 bytes
Redo Buffers 2973696 bytes
Database mounted.
- Step 4 Verify the switchover status in the V$DATABASE view.
SYS@PROD>select database_role,switchover_status from v$database;
DATABASE_ROLE SWITCHOVER_STATUS
---------------- --------------------
PHYSICAL STANDBY TO PRIMARY
SYS@PRODSTD>select database_role,switchover_status from v$database;
DATABASE_ROLE SWITCHOVER_STATUS
---------------- --------------------
PHYSICAL STANDBY TO PRIMARY
- Step 5 Switch the target physical standby database role to the primary role.
SYS@PRODSTD> ALTER DATABASE COMMIT TO SWITCHOVER TO PRIMARY;
Database altered.
此命令成功的条件是没有任何其他的会话连接到主库，如有可以使用如下命令：
ALTER DATABASE COMMIT TO SWITCHOVER TO PHYSICAL STANDBY WITH SESSION SHUTDOWN ;
- Step 6 Finish the transition of the standby database to the primary role.
SYS@PRODSTD>ALTER DATABASE OPEN;
Database altered.
- Step 7 If necessary, restart log apply services on the standby databases.
SYS@PROD>ALTER DATABASE RECOVER MANAGED STANDBY DATABASE DISCONNECT from session parallel 2;
Database altered.
SYS@PROD>SELECT SEQUENCE#, FIRST_TIME, NEXT_TIME,applied from v$archived_log;
SEQUENCE# FIRST_TIM NEXT_TIME APP
---------- --------- --------- ---
17 25-MAR-14 25-MAR-14 YES
17 25-MAR-14 25-MAR-14 YES
18 25-MAR-14 25-MAR-14 YES
18 25-MAR-14 25-MAR-14 NO
19 25-MAR-14 25-MAR-14 YES
19 25-MAR-14 25-MAR-14 NO
20 25-MAR-14 25-MAR-14 YES
20 25-MAR-14 25-MAR-14 NO
21 25-MAR-14 25-MAR-14 YES
26 rows selected.
SYS@PROD>
SYS@PRODSTD>SELECT SEQUENCE#, FIRST_TIME, NEXT_TIME,applied from v$archived_log;
SEQUENCE# FIRST_TIM NEXT_TIME APP
---------- --------- --------- ---
17 25-MAR-14 25-MAR-14 YES
18 25-MAR-14 25-MAR-14 YES
19 25-MAR-14 25-MAR-14 YES
20 25-MAR-14 25-MAR-14 YES
21 25-MAR-14 25-MAR-14 NO
21 25-MAR-14 25-MAR-14 YES
12 rows selected.
- Step 8 Begin sending redo data to the standby databases.
SYS@PRODSTD>ALTER SYSTEM SWITCH LOGFILE;
System altered.
############################################################################################
tail -f alert_PROD.log
Tue Mar 25 13:01:50 2014
Primary database is in MAXIMUM PERFORMANCE mode
RFS[2]: Successfully opened standby log 7: ‘/u01/app/oracle/oradata/PROD/Disk1/standby07.log‘
Tue Mar 25 13:01:51 2014
Media Recovery Log /u01/app/oracle/oradata/PROD/Disk2/arch/1_22_842523531.arc
Media Recovery Waiting for thread 1 sequence 23 (in transit)
tail -f alert_PRODSTD.log
Tue Mar 25 13:01:49 2014
Thread 1 advanced to log sequence 23
Current log# 3 seq# 23 mem# 0: /u01/app/oracle/oradata/PRODSTD/Disk1/redo03.log
Current log# 3 seq# 23 mem# 1: /u01/app/oracle/oradata/PRODSTD/Disk2/redo03_1.log
Tue Mar 25 13:01:51 2014
LNS: Standby redo logfile selected for thread 1 sequence 23 for destination LOG_ARCHIVE_DEST_2
############################################################################################
SYS@PROD>SELECT SEQUENCE#, FIRST_TIME, NEXT_TIME,applied from v$archived_log;
SEQUENCE# FIRST_TIM NEXT_TIME APP
---------- --------- --------- ---
...
17 25-MAR-14 25-MAR-14 YES
17 25-MAR-14 25-MAR-14 YES
18 25-MAR-14 25-MAR-14 YES
18 25-MAR-14 25-MAR-14 NO
19 25-MAR-14 25-MAR-14 YES
19 25-MAR-14 25-MAR-14 NO
20 25-MAR-14 25-MAR-14 YES
20 25-MAR-14 25-MAR-14 NO
21 25-MAR-14 25-MAR-14 YES
22 25-MAR-14 25-MAR-14 YES
27 rows selected.
SYS@PROD>
SYS@PRODSTD>SELECT SEQUENCE#, FIRST_TIME, NEXT_TIME,applied from v$archived_log;
SEQUENCE# FIRST_TIM NEXT_TIME APP
---------- --------- --------- ---
.....
17 25-MAR-14 25-MAR-14
YES
18 25-MAR-14 25-MAR-14 YES
19 25-MAR-14 25-MAR-14 YES
20 25-MAR-14 25-MAR-14 YES
21 25-MAR-14 25-MAR-14 NO
21 25-MAR-14 25-MAR-14 YES
22 25-MAR-14 25-MAR-14 NO
22 25-MAR-14 25-MAR-14 YES
14 rows selected.
############################################################################################
在PRODSTD数据库中创建一个表，验证是否能在PROD数据库中查到。这里的验证可能有点问题。
SYS@PRODSTD>create table switch_tb as select * from dba_objects;
Table created.
SYS@PRODSTD>ALTER SYSTEM SWITCH LOGFILE;
System altered.
tail -f alert_PROD.log
Tue Mar 25 13:05:50 2014
Primary database is in MAXIMUM PERFORMANCE mode
RFS[2]: Successfully opened standby log 6: ‘/u01/app/oracle/oradata/PROD/Disk1/standby06.log‘
Tue Mar 25 13:05:54 2014
Media Recovery Log /u01/app/oracle/oradata/PROD/Disk2/arch/1_23_842523531.arc
Media Recovery Waiting for thread 1 sequence 24 (in transit)
tail -f alert_PRODSTD.log
Tue Mar 25 13:05:49 2014
Thread 1 advanced to log sequence 24
Current log# 4 seq# 24 mem# 0: /u01/app/oracle/oradata/PRODSTD/Disk1/redo04.log
Current log# 4 seq# 24 mem# 1: /u01/app/oracle/oradata/PRODSTD/Disk2/redo04_1.log
Tue Mar 25 13:05:50 2014
LNS: Standby redo logfile selected for thread 1 sequence 24 for destination LOG_ARCHIVE_DEST_2
SYS@PROD>select count(*) from switch_tb;
select count(*) from switch_tb
*
ERROR at line 1:
ORA-01219: database not open: queries allowed on fixed tables/views only
SYS@PROD>startup force
ORACLE instance started.
Total System Global Area 524288000 bytes
Fixed Size 1220360 bytes
Variable Size 176161016 bytes
Database Buffers 343932928 bytes
Redo Buffers 2973696 bytes
Database mounted.
Database opened.
SYS@PROD>select count(*) from switch_tb;
COUNT(*)
----------
9400
SYS@PROD>
############################################################################################
- 第一次切换，主库PROD与备库PRODSTD切换。
- PRODSTD主库切换成备库
SYS@PRODSTD>select database_role,switchover_status from v$database;
DATABASE_ROLE SWITCHOVER_STATUS
---------------- --------------------
PRIMARY TO STANDBY
SYS@PROD>select database_role,switchover_status from v$database;
DATABASE_ROLE SWITCHOVER_STATUS
---------------- --------------------
PHYSICAL STANDBY SESSIONS ACTIVE
SYS@PRODSTD>ALTER DATABASE COMMIT TO SWITCHOVER TO PHYSICAL STANDBY;
Database altered.
SYS@PRODSTD>SHUTDOWN IMMEDIATE;
ORA-01507: database not mounted
ORACLE instance shut down.
SYS@PRODSTD>STARTUP MOUNT;
ORACLE instance started.
Total System Global Area 524288000 bytes
Fixed Size 1220360 bytes
Variable Size 192938232 bytes
Database Buffers 327155712 bytes
Redo Buffers 2973696 bytes
Database mounted.
SYS@PRODSTD>select database_role,switchover_status from v$database;
DATABASE_ROLE SWITCHOVER_STATUS
---------------- --------------------
PHYSICAL STANDBY TO PRIMARY
- PROD备库切换成主库
SYS@PROD>select database_role,switchover_status from v$database;
DATABASE_ROLE SWITCHOVER_STATUS
---------------- --------------------
PHYSICAL STANDBY TO PRIMARY
SYS@PROD>ALTER DATABASE COMMIT TO SWITCHOVER TO PRIMARY;
Database altered.
SYS@PROD>ALTER DATABASE OPEN;
Database altered.
SYS@PROD>select database_role,switchover_status from v$database;
DATABASE_ROLE SWITCHOVER_STATUS
---------------- --------------------
PRIMARY TO STANDBY
- 最后确认备库处于read only状态
Database altered.
OCM_Session8_3_Role Transitions Involving Physical Standby Databases,古老的榕树,5-wow.com
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