实例启动时报ORA-00845的解决方法
idle> startup
ORA-00845: MEMORY_TARGET not supported on this system
因为我一个库里有两个实例,启动时/dev/shm就不够用了。
在Oracle 11g中如果采用AMM内存管理,那么当MEMORY_TARGET的值大于/dev/shm的时候,就会报ORA-00845: MEMORY_TARGET not supported on this system错误,解决办法增加/dev/shm大小,在redhat系列系统中,/dev/shm的默认值是系统总内存的一半
1、修改/dev/shm大小
[oracle@rtest ~]$ df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 140G 57G 76G 43% /
/dev/sda1 99M 12M 82M 13% /boot
tmpfs 3.9G 995M 3.0G 25% /dev/shm
[oracle@rtest ~]$ mount -o size=8G -o nr_inodes=1000000 -o noatime,nodiratime -o remount /dev/shm
mount: only root can do that
[oracle@rtest ~]$ su -
Password:
[root@rtest ~]# mount -o size=8G -o nr_inodes=1000000 -o noatime,nodiratime -o remount /dev/shm
[root@rtest ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 140G 57G 76G 43% /
/dev/sda1 99M 12M 82M 13% /boot
tmpfs 8.0G 995M 7.1G 13% /dev/shm
2、 vi /etc/fstab
LABEL=/ / ext3 defaults 1 1
LABEL=/boot /boot ext3 defaults 1 2
tmpfs /dev/shm tmpfs defaults,size=8G 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
sysfs /sys sysfs defaults 0 0
proc /proc proc defaults 0 0
LABEL=SWAP-sda2 swap swap defaults 0 0
3、启动数据库验证:
[oracle@rtest ~]$ export ORACLE_SID=test0924
[oracle@rtest ~]$ sqlplus / as sysdba
SQL*Plus: Release 11.2.0.3.0 Production on Mon Oct 28 14:41:13 2013
Copyright (c) 1982, 2011, Oracle. All rights reserved.
Connected to an idle instance.
idle> idle>
idle> conn /as sysdba
Connected to an idle instance.
idle> startup
ORACLE instance started.
Total System Global Area 33