状态列表:
In Oracle documentation explain SWITCHOVER_STATUS column of v$database can have the following values:
NOT ALLOWED – Either this is a standby database and the primary database has not been switched first, or this is a primary database and there are no standby databases.
SESSIONS ACTIVE – Indicates that there are active SQL sessions attached to the primary or standby database that need to be disconnected before the switchover operation is permitted.
SWITCHOVER PENDING – This is a standby database and the primary database switchover request has been received but not processed.
SWITCHOVER LATENT – The switchover was in pending mode, but did not complete and went back to the primary database.
TO PRIMARY – This is a standby database, with no active sessions, that is allowed to switch over to a primary database.
TO STANDBY – This is a primary database, with no active sessions, that is allowed to switch over to a standby database.
RECOVERY NEEDED – This is a standby database that has not received the switchover request.
解决:
SQL> select name,database_role,switchover_status from v$database; NAME DATABASE_ROLE SWITCHOVER_STATUS --------------------------- ------------------------------------------------ ------------------------------------------------------------ MTXDB PHYSICAL STANDBY NOT ALLOWED SQL> select PROCESS, STATUS, GROUP#, SEQUENCE#, BLOCK#, BLOCKS from v$managed_standby; PROCESS STATUS GROUP# SEQUENCE# BLOCK# BLOCKS --------------------------- ------------------------------------ ------------------------------------------------------------------------------------------------------------------------ ---------- ---------- ---------- ARCH CONNECTED N/A 0 0 0 DGRD ALLOCATED N/A 0 0 0 DGRD ALLOCATED N/A 0 0 0 ARCH CONNECTED N/A 0 0 0 ARCH CONNECTED N/A 0 0 0 ARCH CONNECTED N/A 0 0 0 MRP0 APPLYING_LOG N/A 57 2346 409600 RFS IDLE N/A 0 0 0 RFS IDLE 2 57 2346 1 9 rows selected. SQL> select database_role,switchover_status from v$database; DATABASE_ROLE SWITCHOVER_STATUS ------------------------------------------------ ------------------------------------------------------------ PHYSICAL STANDBY NOT ALLOWED SQL> alter database recover managed standby database finish force; Database altered. SQL> select database_role,switchover_status from v$database; DATABASE_ROLE SWITCHOVER_STATUS ------------------------------------------------ ------------------------------------------------------------ PHYSICAL STANDBY TO PRIMARY SQL> shutdown immediate; ORA-01109: database not open Database dismounted. ORACLE instance shut down. SQL> startup; ORACLE instance started. Total System Global Area 2466250400 bytes Fixed Size 9137824 bytes Variable Size 536870912 bytes Database Buffers 1912602624 bytes Redo Buffers 7639040 bytes Database mounted. Database opened. SQL> alter database recover managed standby database disconnect from session; Database altered. SQL> select database_role,switchover_status from v$database; DATABASE_ROLE SWITCHOVER_STATUS ------------------------------------------------ ------------------------------------------------------------ PHYSICAL STANDBY TO PRIMARY
产生DataGuard ora-16157故障:
关于这个问题,oracle 官方的回答是要重装DG,考虑实际情况,alter database recover managed standby database finish force 之后,系统没有更改,只需要在nomount 备库之后,在主库产生standby backup control file,然后在备机用些控制文件加载就可以了,测试通过.
在主库
SQL> alter system archive log current; System altered. SQL> alter system checkpoint; System altered. SQL> SELECT UNIQUE THREAD#, MAX(SEQUENCE#) OVER(PARTITION BY THREAD#) LAST FROM v$archived_log; THREAD# LAST ---------- ---------- 1 66
SQL> ALTER DATABASE CREATE standby CONTROLFILE AS ‘/tmp/controlfs01.ctl‘;
Database altered.
--scp到备库
在备库:
SQL> shutdown immediate; Database closed. Database dismounted. ORACLE instance shut down. SQL> startup mount; ORACLE instance started.