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ADG不影响主库下的备库FAILOVER测试

2013年08月20日 DG&RAC&OGG 暂无评论 阅读 1,864 次

众所周知,当数据库dg搭建完成后,都需要进行switchover和failover测试,其中failover在生产中很难进行测试,下边便是一个在不影响主库的情况下,进行的一个模拟的failover的测试,以便对当前dg的可用性的一个测试。

之前,我在主备库同步的情况下,将主备库中的文件tnsnames.ora中的相关配置注销后,以为主备库会不同步以便进行failover的测试,但是在实际测试中,主备库还是保持同步的,所以,可以推测,数据库已经将这些配置记录进内存或者数据库中了。所以该条路无法进行测试。

下边便是一个在11g版本中,使用备库闪回及ADG特性的一个rac+dg的可行测试方案。

====================================================================================================
设置备库闪回

SQL> select log_mode from v$database;

LOG_MODE
------------
ARCHIVELOG

SQL> show parameter db_recovery_file_dest

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
db_recovery_file_dest                string      /u01/app/oracle/flash_recovery
                                                 _area/rac_adg
db_recovery_file_dest_size           big integer 3852M

SQL> show parameter db_flashback_retention_target

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
db_flashback_retention_target        integer     1440


SQL> select FLASHBACK_ON from v$database;

FLASHBACK_ON
------------------
NO

SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup mount
ORACLE instance started.

Total System Global Area  630501376 bytes
Fixed Size                  2230992 bytes
Variable Size             264242480 bytes
Database Buffers          360710144 bytes
Redo Buffers                3317760 bytes
Database mounted.
SQL> alter database flashback on;

Database altered.

SQL> alter database open;

Database altered.

SQL> alter database recover managed standby database disconnect from session;

Database altered.

主库2个节点的状态

[grid@11grac1 ~]$ crs_stat -t
Name           Type           Target    State     Host        
------------------------------------------------------------
ora....SM1.asm application    ONLINE    ONLINE    11grac1     
ora....C1.lsnr application    ONLINE    ONLINE    11grac1     
ora....ac1.gsd application    OFFLINE   OFFLINE               
ora....ac1.ons application    ONLINE    ONLINE    11grac1     
ora....ac1.vip ora....t1.type ONLINE    ONLINE    11grac1     
ora....SM2.asm application    ONLINE    ONLINE    11grac2     
ora....C2.lsnr application    ONLINE    ONLINE    11grac2     
ora....ac2.gsd application    OFFLINE   OFFLINE               
ora....ac2.ons application    ONLINE    ONLINE    11grac2     
ora....ac2.vip ora....t1.type ONLINE    ONLINE    11grac2     
ora.DATA.dg    ora....up.type ONLINE    ONLINE    11grac1     
ora....ER.lsnr ora....er.type ONLINE    ONLINE    11grac1     
ora....N1.lsnr ora....er.type ONLINE    ONLINE    11grac2     
ora.asm        ora.asm.type   ONLINE    ONLINE    11grac1     
ora.cvu        ora.cvu.type   ONLINE    ONLINE    11grac2     
ora.gsd        ora.gsd.type   OFFLINE   OFFLINE               
ora....network ora....rk.type ONLINE    ONLINE    11grac1     
ora.oc4j       ora.oc4j.type  ONLINE    ONLINE    11grac2     
ora.ons        ora.ons.type   ONLINE    ONLINE    11grac1     
ora.racdb.db   ora....se.type ONLINE    ONLINE    11grac1     
ora.scan1.vip  ora....ip.type ONLINE    ONLINE    11grac2 

备库状态

SQL> select open_mode from v$database;

OPEN_MODE
--------------------
READ ONLY WITH APPLY


确认同步
主库任意节点操作

SQL> sho user
USER is "TEST"
SQL> select * from yallonking;

        ID NAME                 MYDATE
---------- -------------------- ---------
         1 yallonking           14-MAY-13
         2 oraking              14-MAY-13
         3 oraking              14-MAY-13

SQL> insert into yallonking values(4,'cfca',sysdate);

1 row created.

SQL> commit;

Commit complete.

SQL> select * from yallonking;

        ID NAME                 MYDATE
---------- -------------------- ---------
         4 cfca                 20-AUG-13
         1 yallonking           14-MAY-13
         2 oraking              14-MAY-13
         3 oraking              14-MAY-13
		 
SQL> conn /as sysdba
Connected.
SQL> alter system archive log current;

System altered.

备库验证

SQL> conn test/test
Connected.
SQL> select * from yallonking;

        ID NAME                 MYDATE
---------- -------------------- ---------
         4 cfca                 20-AUG-13
         1 yallonking           14-MAY-13
         2 oraking              14-MAY-13
         3 oraking              14-MAY-13

开始进行failover测试(备库读写打开后并恢复原状继续同步于主库的测试)

在备库操作

SQL> alter database recover managed standby database cancel;

Database altered.

SQL> alter database recover managed standby database finish;

Database altered.

SQL> alter database commit to switchover to primary with session shutdown;

Database altered.

SQL> alter database open;

Database altered.

SQL> select open_mode from v$database;

OPEN_MODE
--------------------
READ WRITE

下边在主库任意节点插入测试数据

SQL> select * from test.yallonking;

        ID NAME                 MYDATE
---------- -------------------- ---------
         4 cfca                 20-AUG-13
         1 yallonking           14-MAY-13
         2 oraking              14-MAY-13
         3 oraking              14-MAY-13

SQL> insert into test.yallonking values(5,'yunxingbu',sysdate); 

1 row created.

SQL> commit;

Commit complete.

SQL> alter system archive log current;

System altered.

在备库查确认已经看不到同步后的数据

SQL> select * from test.yallonking;

        ID NAME                 MYDATE
---------- -------------------- ---------
         4 cfca                 20-AUG-13
         1 yallonking           14-MAY-13
         2 oraking              14-MAY-13
         3 oraking              14-MAY-13

在备库插入测试数据

SQL> insert into test.yallonking values(6,'ceshi',sysdate);

1 row created.

SQL> commit;

Commit complete.

SQL> alter system archive log current;

System altered.

在主库查看是否有影响

SQL> select * from test.yallonking;

        ID NAME                 MYDATE
---------- -------------------- ---------
         4 cfca                 20-AUG-13
         1 yallonking           14-MAY-13
         2 oraking              14-MAY-13
         3 oraking              14-MAY-13
         5 yunxingbu            20-AUG-13

下边开始恢复备库为之前的状态

SQL> select to_char(standby_became_primary_scn) fallover_scn from v$database;

FALLOVER_SCN
----------------------------------------
1354815

SQL> shutdown abort
ORACLE instance shut down.
SQL> startup mount;
ORACLE instance started.

Total System Global Area  630501376 bytes
Fixed Size                  2230992 bytes
Variable Size             264242480 bytes
Database Buffers          360710144 bytes
Redo Buffers                3317760 bytes
Database mounted.
SQL> flashback database to scn 1354815;

Flashback complete.

SQL> alter database convert to physical standby;

Database altered.

SQL> shutdown immediate;
ORA-01507: database not mounted


ORACLE instance shut down.
SQL> startup
ORACLE instance started.

Total System Global Area  630501376 bytes
Fixed Size                  2230992 bytes
Variable Size             264242480 bytes
Database Buffers          360710144 bytes
Redo Buffers                3317760 bytes
Database mounted.
Database opened.
SQL> alter database recover managed standby database disconnect from session;

Database altered.

检查备库数据同步情况

SQL> select * from test.yallonking;

        ID NAME                 MYDATE
---------- -------------------- ---------
         4 cfca                 20-AUG-13
         1 yallonking           14-MAY-13
         2 oraking              14-MAY-13
         3 oraking              14-MAY-13
         5 yunxingbu            20-AUG-13

至此全部OK!

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