快照Standby

Posted 2020-06-20

1.物理备库转换成快照备库：

1.1查看备库当前状态，处于只读、实时恢复模式：

SQL> SELECT database_role, switchover_status, open_mode, protection_mode, protection_level FROM v$database;

 

DATABASE_ROLE    SWITCHOVER_STATUS    OPEN_MODE            PROTECTION_MODE      PROTECTION_LEVEL

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

PHYSICAL STANDBY NOT ALLOWED          READ ONLY WITH APPLY MAXIMUM AVAILABILITY MAXIMUM AVAILABILITY

1.2取消日志应用：

SQL> alter database recover managed standby database cancel;

SQL> SELECT database_role, switchover_status, open_mode, protection_mode, protection_level FROM v$database;

 

DATABASE_ROLE    SWITCHOVER_STATUS    OPEN_MODE            PROTECTION_MODE      PROTECTION_LEVEL

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

PHYSICAL STANDBY NOT ALLOWED          READ ONLY            MAXIMUM AVAILABILITY MAXIMUM AVAILABILITY 

1.3执行转换：

SQL> alter database convert to snapshot standby;

SQL> SELECT database_role, switchover_status, open_mode, protection_mode, protection_level FROM v$database;

 

DATABASE_ROLE    SWITCHOVER_STATUS    OPEN_MODE            PROTECTION_MODE      PROTECTION_LEVEL

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

SNAPSHOT STANDBY NOT ALLOWED          MOUNTED              MAXIMUM AVAILABILITY UNPROTECTED

SQL> SELECT database_role, switchover_status, open_mode, protection_mode, protection_level FROM v$database;

DATABASE_ROLE    SWITCHOVER_STATUS    OPEN_MODE            PROTECTION_MODE      PROTECTION_LEVEL

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

PHYSICAL STANDBY RECOVERY NEEDED      READ ONLY            MAXIMUM AVAILABILITY MAXIMUM AVAILABILITY

SQL> alter database recover managed standby database using current logfile disconnect from session;

1.4打开数据库：

SQL> alter database open;

SQL> SELECT database_role, open_mode FROM v$database;

 

DATABASE_ROLE    OPEN_MODE

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

SNAPSHOT STANDBY READ WRITE

2.验证快照standby：

SQL> create tablespace snapshotbs datafile‘/u01/app/oradata/testdb/snapshotbs01.dbf‘ size 10M;

SQL> column name format a50;

SQL> SELECT name FROM v$datafile;

 

NAME

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

/u01/app/oradata/testdb/system01.dbf

/u01/app/oradata/testdb/sysaux01.dbf

/u01/app/oradata/testdb/undotbs01.dbf

/u01/app/oradata/testdb/users01.dbf

/u01/app/oradata/testdb/example01.dbf

/u01/app/oradata/testdb/snapshotbs01.dbf

 

SQL> create table snapshotable( id int, namevarchar2(30)) tablespace snapshotbs;

SQL> SELECT table_name, tablespace_name FROM user_tables WHERE table_name=‘SNAPSHOTABLE‘;

TABLE_NAME       TABLESPACE_NAME

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

SNAPSHOTABLE       SNAPSHOTBS

SQL> insert into snapshotable values( 1, ‘Test Snapshot Standby‘);

SQL> commit;

SQL> SELECT * FROM snapshotable;

ID NAME

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

1 Test Snapshot Standby

SQL> alter system switch logfile;

3.切换还原成物理备库

3.1关闭数据库:

SQL> SELECT database_role, open_mode FROM v$database;

 

DATABASE_ROLE    OPEN_MODE

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

SNAPSHOT STANDBY READ WRITE

 

SQL> alter database convert to physical standby;

alter database convert to physical standby

*

ERROR at line 1:

ORA-01126: database must be mounted in this instance and notopen in any instance

 

SQL> shutdown immediate;

3.2启动到mount状态：

SQL> startup mount;

3.3进行切换

SQL> alter database convert to physical standby;

SQL> alter database open;

alter database open

*

ERROR at line 1:

ORA-01507: database not mounted

3.4重启数据库，并置于open状态：

SQL> shutdown abort;

SQL> startup;

3.5应用日志

SQL> SELECT database_role, open_mode FROM v$database;

 

DATABASE_ROLE    OPEN_MODE

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

PHYSICAL STANDBY READ ONLY

 

SQL> SELECT database_role, switchover_status, open_mode,protection_mode, protection_level FROM v$database;

 

DATABASE_ROLE    SWITCHOVER_STATUS    OPEN_MODE            PROTECTION_MODE      PROTECTION_LEVEL

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

PHYSICAL STANDBY RECOVERY NEEDED      READ ONLY            MAXIMUM AVAILABILITY MAXIMUM AVAILABILITY

 

SQL> alter database recover managed standby database using current logfile disconnect from session;

SQL> SELECT database_role, open_mode FROM v$database;

 

DATABASE_ROLE    OPEN_MODE

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

PHYSICAL STANDBY READ ONLY WITH APPLY

 

SQL> 

SQL> SELECT name FROM v$datafile;

 

NAME

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

/u01/app/oradata/testdb/system01.dbf

/u01/app/oradata/testdb/sysaux01.dbf

/u01/app/oradata/testdb/undotbs01.dbf

/u01/app/oradata/testdb/users01.dbf

/u01/app/oradata/testdb/example01.dbf

 

SQL> SELECT * FROM snapshotable;

SELECT * FROM snapshotable

              *

ERROR at line 1:

ORA-00942: table or view does not exist

 

 

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