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  • ORA00845: MEMORY_TARGET not supported on this system

          今天晚上新装一台Oracle 11g的数据库,打算将SGA设大一点,知道 11g 中有一个新特新 MEMORY_TARGET,于是尝一下鲜,谁知报了个 ORA-00845,报错比较容易迷惑人,不借助Google真得想半天:

    SQL> alter system set memory_max_target=3G scope=spfile ; 
    
    System altered.
    
    SQL> alter system set memory_target=2G scope=spfile ;      
    
    System altered.
    
    SQL> 
    SQL> shutdown immediate 
    Database closed.
    Database dismounted.
    ORACLE instance shut down.
    SQL> startup ; 
    ORA-00845: MEMORY_TARGET not supported on this system

          来自Oracle的官方解析是:

    Starting with Oracle Database 11g, the Automatic Memory Management feature requires more shared memory (/dev/shm)and file descriptors. The size of the shared memory should be at least the greater of MEMORY_MAX_TARGET and MEMORY_TARGET for each Oracle instance on the computer. If MEMORY_MAX_TARGET or MEMORY_TARGET is set to a non zero value, and an incorrect size is assigned to the shared memory, it will result in an ORA-00845 error at startup.

          简单来说就是 MEMORY_MAX_TARGET 的设置不能超过 /dev/shm 的大小:

    [oracle@FWDB FWDB]$ df -h | grep shm
    tmpfs                 2.0G     0  2.0G   0% /dev/shm

          还真是撞到这个枪口上了:

          马上把它加大:

    [root@FWDB ~]# cat /etc/fstab | grep tmpfs
    tmpfs                   /dev/shm                tmpfs   defaults,size=4G 0 0

          现在可以通过重启使这个配置生效,也可以通过重新挂载来修改其大小:

    [root@FWDB ~]# mount -o remount,size=4G /dev/shm
    [root@FWDB ~]# df -h | grep shm
    tmpfs                 4.0G     0  4.0G   0% /dev/shm

          再次启动数据库,没有报错了。

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  • 原文地址:https://www.cnblogs.com/killkill/p/1823690.html
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