Oracle 19C Data Guard基礎運維-02 Switchovers(物理)
Oracle 19C Data Guard 基礎運維 -02 S witchover s( 物理 )
原主庫 |
原備庫 |
Switchovers |
新主庫 |
新備庫 |
192.168.31.90 |
192.168.31.100 |
192.168.31.100 |
192.168.31.90 | |
cjcdb |
chendb |
chendb |
cjcdb |
原理:
Figure 9-1 Oracle Data Guard Configuration Before Switchover
Figure 9-2 Standby Databases Before Switchover to the New Primary Database
Figure 9-3 Oracle Data Guard Environment After Switchover
Performing a Switchover to a Physical Standby Database
31.90 主庫
SQL> select database_role,protection_level,protection_mode from v$database;
DATABASE_ROLE PROTECTION_LEVEL PROTECTION_MODE
---------------- -------------------- --------------------
PRIMARY MAXIMUM PERFORMANCE MAXIMUM PERFORMANCE
31.100 備庫
SQL> select database_role,protection_level,protection_mode from v$database;
DATABASE_ROLE PROTECTION_LEVEL PROTECTION_MODE
---------------- -------------------- --------------------
PHYSICAL STANDBY MAXIMUM PERFORMANCE MAXIMUM PERFORMANCE
1. 驗證目標備用資料庫是否已準備好進行切換。
Verify that the target standby database is ready for switchover.
31.90 主庫
SQL> select switchover_status from v$database;
SWITCHOVER_STATUS
--------------------
TO STANDBY
或
SQL> alter database switchover to chendb verify;
Database altered
2. 在主資料庫 CJCDB 上啟動切換,方法是發出以下命令
Initiate the switchover on the primary database, CJCDB , by issuing the following
31.90 主庫
SQL> alter database switchover to chendb;
Database altered.
3. 在新的主資料庫 chendb 上發出以下 SQL 語句以開啟它。
Issue the following SQL statement on the new primary database, CHICAGO , to open
it.
SQL> alter database open;
4. 發出以下 SQL 語句以裝載新的物理備用資料庫 CJCDB :
Issue the following SQL statement to mount the new physical standby database,
BOSTON :
SQL>startup mount;
或者,如果 CJCDB 是Oracle Active Data Guard物理備用資料庫,則發出以下SQL語句以只讀方式開啟它:
Or, if BOSTON is an Oracle Active Data Guard physical standby database, then
issue the following SQL statement to open it read only:
SQL> STARTUP;
5 . 在新的物理備用資料庫 CJCDB 上啟動Redo Apply 。例如:
Start Redo Apply on the new physical standby database. For example:
3.90 新備庫
SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE DISCONNECT FROM SESSION;
SQL> select database_role,protection_level,protection_mode from v$database;
DATABASE_ROLE PROTECTION_LEVEL PROTECTION_MODE
---------------- -------------------- --------------------
PHYSICAL STANDBY MAXIMUM PERFORMANCE MAXIMUM PERFORMANCE
3.100 新主庫
SQL> select database_role,protection_level,protection_mode from v$database;
DATABASE_ROLE PROTECTION_LEVEL PROTECTION_MODE
---------------- -------------------- --------------------
PRIMARY MAXIMUM PERFORMANCE MAXIMUM PERFORMANCE
同步測試:
新主庫chendb:
SQL> create table test2 as select level as id from dual connect by level <=3;
新備庫cjcpdb:
SQL> select * from test2;
ID
----------
1
2
3
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