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今天晚上新裝一臺Oracle 11g的數(shù)據(jù)庫，打算將SGA設(shè)大一點，知道 11g 中有一個新特新 MEMORY_TARGET，于是嘗一下鮮，誰知報了個 ORA-00845，報錯比較容易迷惑人，不借助Google真得想半天： 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 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/> 1 2 [oracle@FWDB FWDB]$ df -h | grep shm tmpfs 2.0G 0 2.0G 0% /dev/shm 還真是撞到這個槍口上了： 馬上把它加大： 1 2 [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配置生效，也可以通過重新掛載來修改其大小： 1 2 3 [root@FWDB ~]# mount -o remount,size=4G /dev/shm [root@FWDB ~]# df -h | grep shm tmpfs 4.0G 0 4.0G 0% /dev/shm 再次啟動數(shù)據(jù)庫，沒有報錯了。 |
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