oracle dg snapshot,Oracle Broker Snapshot Standby测试

Oracle 11g Dataguard Snapshot Standby数据库功能，可将备库置于打开读写状态，进行模拟生产环境主库中测试。当备库Snapshot standby任务完成后，可以切换回物理备库角色。在Snapshot Standby数据库状态下，备库是可以接受主库传过来的日志，但是不能够将变化应用在备库中。

1. 采用DG Broker配置Snapshot Standby配置

1) 查看配置信息

$ dgmgrl sys/oracle

DGMGRL for Linux: Version 11.2.0.1.0 - 64bit Production

Welcome to DGMGRL, type "help" for information.

Connected.

DGMGRL> show configuration

Configuration - dgfxoptdb

Protection Mode: MaxAvailability

Databases:

fxopt - Primary database

fxopt_std - Physical standby database

Fast-Start Failover: DISABLED

Configuration Status:

SUCCESS

2. 转换备库为镜像库(Snapshot Standby)

DGMGRL> convert database fxopt_std to snapshot standby;

Converting database "fxopt_std" to a Snapshot Standby database, please wait...

Database "fxopt_std" converted successfully

这里必须要开启Flashback功能，否则会失败，报不能创建还原点的错误！

--开启FLASHBACK功能

SQL> select name,flashback_on from v$database;

SQL> show parameter db_recovery

SQL> alter system set db_recovery_file_dest_size='2G';

SQL> alter system set db_recovery_file_dest='/u01/fast_recovery_area';

SQL> alter system set db_flashback_retention_target = 1440;

--重启数据库

SQL> alter database flashback on;

SQL> alter database open;

DGMGRL> show configuration

Configuration - dgfxoptdb

Protection Mode: MaxAvailability

Databases:

fxopt - Primary database

fxopt_std - Snapshot standby database

Fast-Start Failover: DISABLED

Configuration Status:

SUCCESS

SQL> select open_mode,database_role,db_unique_name from v$database;

OPEN_MODE DATABASE_ROLE DB_UNIQUE_NAME

--------------------- ------------------------ ------------------------

READ WRITE SNAPSHOT STANDBY fxopt_std

3. 测试镜像库

1) 备库上操作

SQL> select open_mode,database_role,db_unique_name from v$database;

OPEN_MODE DATABASE_ROLE DB_UNIQUE_NAME

--------------------- ------------------------ ------------------------

READ WRITE SNAPSHOT STANDBY fxopt_std

现在备库已经是READ WRITE状态，数据库角色也是SNAPSHOT STANDBY。

SQL> conn abc/abc

Connected.

SQL> select * from tab;

TNAME TABTYPE CLUSTERID

------------------------------------------------------------ -------------- ----------

TTT

SQL> select * from ttt;

NAME SCORE

---------------------------------------- ----------

Evan 100

SQL> insert into ttt values('Richard', 98);

1 row created.

SQL> commit;

Commit complete.

SQL> create table abc(id number, name varchar2(20), grade number);

Table created.

SQL> insert into abc values(1,'Richar',2003);

1 row created.

SQL> commit;

Commit complete.

SQL> select * from tab;

TNAME TABTYPE CLUSTERID

------------------------------------------------------------ -------------- ----------

ABC TABLE

TTT TABLE

SQL> select * from abc;

ID NAME GRADE

---------- ---------------------------------------- ----------

1 Richar 2003

可以在备库做查询和修改操作。

2) 主库上查看

SQL> select open_mode,database_role,db_unique_name from v$database;

OPEN_MODE DATABASE_ROLE DB_UNIQUE_NAME

-------------------- ---------------- ------------------------------

READ WRITE PRIMARY fxopt

在主库上插入记录，并切换日志。

SQL> conn abc/abc

Connected.

SQL> select * from ttt;

NAME SCORE

---------------------------------------- ----------

Evan 100

SQL> insert into ttt values('Lilly', 99);

1 row created.

SQL> commit;

Commit complete.

SQL> select * from ttt;

NAME SCORE

---------------------------------------- ----------

Evan 100

Lilly 99

SQL> conn / as sysdba;

SQL> archive log list;

Database log mode Archive Mode

Automatic archival Enabled

Archive destination /ora_rman/arc

Oldest online log sequence 50

Next log sequence to archive 52

Current log sequence 52

查看主库规档日志：

$ ll

-rw-r----- 1 oracle oinstall 154624 Mar 7 15:48 ARC_0001_0000000043_0841415433.arc

-rw-r----- 1 oracle oinstall 58368 Mar 7 15:50 ARC_0001_0000000044_0841415433.arc

-rw-r----- 1 oracle oinstall 11776 Mar 7 15:51 ARC_0001_0000000045_0841415433.arc

-rw-r----- 1 oracle oinstall 1559040 Mar 7 16:01 ARC_0001_0000000046_0841415433.arc

-rw-r----- 1 oracle oinstall 1024 Mar 7 16:02 ARC_0001_0000000047_0841415433.arc

-rw-r----- 1 oracle oinstall 486400 Mar 7 16:02 ARC_0001_0000000048_0841415433.arc

-rw-r----- 1 oracle oinstall 58368 Mar 7 16:03 ARC_0001_0000000049_0841415433.arc

-rw-r----- 1 oracle oinstall 66048 Mar 7 16:06 ARC_0001_0000000050_0841415433.arc

-rw-r----- 1 oracle oinstall 36864 Mar 7 16:07 ARC_0001_0000000051_0841415433.arc

主库上切换日志，说明52号日志是刚才规档的日志。

SQL> alter system switch logfile;

System altered.

SQL> archive log list;

Database log mode Archive Mode

Automatic archival Enabled

Archive destination /ora_rman/arc

Oldest online log sequence 51

Next log sequence to archive 53

Current log sequence 53