今天晚上新裝一臺(tái)Oracle 11g的數(shù)據(jù)庫(kù),打算將SGA設(shè)大一點(diǎn),知道 11g 中有一個(gè)新特新 MEMORY_TARGET,于是嘗一下鮮,誰(shuí)知報(bào)了個(gè) ORA-00845,報(bào)錯(cuò)比較容易迷惑人,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來(lái)自O(shè)racle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.
簡(jiǎn)單來(lái)說(shuō)就是 MEMORY_MAX_TARGET 的設(shè)置不能超過(guò) /dev/shm 的大小:
[oracle@FWDB FWDB]$ df -h | grep shmtmpfs 2.0G 0 2.0G 0% /dev/shm 還真是撞到這個(gè)槍口上了:馬上把它加大:
[root@FWDB ~]# cat /etc/fstab | grep tmpfstmpfs /dev/shm tmpfs defaults,size=4G 0 0 現(xiàn)在可以通過(guò)重啟使這個(gè)配置生效,也可以通過(guò)重新掛載來(lái)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 再次啟動(dòng)數(shù)據(jù)庫(kù),沒(méi)有報(bào)錯(cuò)了。
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