【测试】切换保护模式，最大性能到最大可用

①查看数据库模式：

主库：

SQL> select name,protection_mode,database_role,switchover_status from v$database;

NAME      PROTECTION_MODE      DATABASE_ROLE    SWITCHOVER_STATUS
--------- -------------------- ---------------- --------------------
ORA11GR2  MAXIMUM PERFORMANCE  PRIMARY          TO STANDBY

备库：

SQL> select name,protection_mode,database_role,switchover_status from v$database;

NAME      PROTECTION_MODE      DATABASE_ROLE    SWITCHOVER_STATUS
--------- -------------------- ---------------- --------------------
ORA11GR2  MAXIMUM PERFORMANCE  PHYSICAL STANDBY NOT ALLOWED

②将主库起到mount状态：

 

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

Total System Global Area  830930944 bytes
Fixed Size                  2257800 bytes
Variable Size             608177272 bytes
Database Buffers          213909504 bytes
Redo Buffers                6586368 bytes
Database mounted.

 

③修改参数：

SQL> alter system set LOG_ARCHIVE_DEST_2='SERVICE=SBDB20 LGWR SYNC AFFIRM VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE) DB_UNIQUE_NAME=SBDB';

System altered.

SQL> alter database set standby database to maximize availability;

Database altered.

④将主库起到open状态验证：

 

SQL> alter database open;

Database altered.

SQL> select name,protection_mode,database_role,switchover_status from v$database;

NAME      PROTECTION_MODE      DATABASE_ROLE    SWITCHOVER_STATUS
--------- -------------------- ---------------- --------------------
ORA11GR2  MAXIMUM AVAILABILITY    PRIMARY          FAILED DESTINATION