今天晚上新裝一臺(tái)Oracle 11g的數(shù)據(jù)庫,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:
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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.
簡單來說就是 MEMORY_MAX_TARGET 的設(shè)置不能超過 /dev/shm 的大?。?br>
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[oracle@FWDB FWDB]$ df -h | grep shm
tmpfs 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:
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[root@FWDB ~]# cat /etc/fstab | grep tmpfs
tmpfs /dev/shm tmpfs defaults,size=4G 0 0
現(xiàn)在可以通過重啟使這個(gè)配置生效,也可以通過重新掛載來修改其大?。?br>
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[root@FWDB ~]# mount -o remount,size=4G /dev/shm
[root@FWDB ~]# df -h | grep shm
tmpfs 4.0G 0 4.0G 0% /dev/shm
再次啟動(dòng)數(shù)據(jù)庫,沒有報(bào)錯(cuò)了。
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