ORA-00845 MEMORY_TARGET not supported on this system解决办法

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ORA-00845: MEMORY_TARGET not supported on this system报错解决

Oracle 11g数据库修改pfile参数后启动数据库报错ora-00845

SQL> startup

ORA-00845: MEMORY_TARGET not supported on this system

在oracle 11g中新增的内存自动管理的参数MEMORY_TARGET,它能自动调整SGA和PGA,这个特性需要用到/dev/shm共享文件系统,而且要求/dev/shm必须大于MEMORY_TARGET,如果/dev/shm比MEMORY_TARGET小就会报错

解决方案

1.初始化参数MEMORY_TARGET或MEMORY_MAX_TARGET不能大于共享内存(/dev/shm),为了解决这个问题,可以增大/dev/shm

如:

 

2.如果/dev/shm没有挂载也会报上面的错,所认需要确保已经挂载

[email protected] ~]$ df -h

……

tmpfs                16G 8.9G 7.2G 56% /dev/shm

……

下面为一次操作的记录

[[email protected] ~]# cat /etc/fstab | grep tmpfs

tmpfs                  /dev/shm              tmpfs  defaults,size=8g      0 0

[[email protected] ~]#

[[email protected] ~]# mount -o remount,size=16G /dev/shm

[[email protected] ~]# vi /etc/fstab

...

tmpfs                  /dev/shm              tmpfs  defaults,size=16g      0 0

...

[[email protected] ~]# df -h | grep shm

tmpfs                16G    0  16G  0% /dev/shm

SQL> startup

ORACLE instance started.

Total System Global Area 9420095488 bytes

Fixed Size                2236248 bytes

Variable Size          2315255976 bytes

Database Buffers        7046430720 bytes

Redo Buffers              56172544 bytes

Database mounted.

Database opened.

SQL> exit

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解决办法:ORA-00845: MEMORY_TARGET not supported on thi