快照Standby

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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