ORA-01093错误解决

ORA-01093错误解决

环境是RAC+RAC的DG的10.2.0.5环境
 
当时是把主备库打开，想启动MRP进程（实时应用），但是执行语句时出现1093错误：

SQL> alter database recover managed standby database ;
 alter database recover managed standby database
 *
 ERROR at line 1:
 ORA-01093: ALTER DATABASE CLOSE only permitted with no sessions connected

SQL> !oerr ora 1093
 01093, 00000, "ALTER DATABASE CLOSE only permitted with no sessions connected"
 // *Cause:  There is at least one more session other than the current one
 //        logged into the instance.  ALTER DATABASE CLOSE is not permitted.
 // *Action: Find the other sessions and log them out and resubmit the command

上面说的很清楚：原因是多于一个的会话连接当前数据库实例。ALTER DATABASE CLOSE is not permitted;

解决办法是退出该会话；
 
字面意思没有很懂，当我查看主备库状态时发现备库处于只读状态：
 
SQL> select open_mode from gv$database;
 

OPEN_MODE
 ----------
 READ ONLY
 READ ONLY

哎，粗心误大事啊，启动实时应用备库需要在mount状态下的；

解决办法是，把备库启动到mount状态下，再执行：

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

Total System Global Area  327155712 bytes
 Fixed Size                  1273516 bytes
 Variable Size              96469332 bytes
 Database Buffers          226492416 bytes
 Redo Buffers                2920448 bytes
 Database mounted.
 SQL> alter database recover managed standby database disconnect from session;

Database altered.

ok，问题解决，其实就是要注意启用MRP，备库要处于MOUNT状态下进行
 
(注意：Oracle 10g，要在mount状态下，才能开启MRP。然而11g在open就可以)

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