ORA-00845: MEMORY_TARGET not supported on this system
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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 shmtmpfs 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 tmpfstmpfs /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 shmtmpfs 4.0G 0 4.0G 0% /dev/shm
再次启动数据库,没有报错了。
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