idle> startup ORA-00845: MEMORY_TARGET not supported on this system 因為我一個庫裡有兩個例項，啟動時 /dev/shm就不夠用了。

在Oracle 11g中如果採用AMM記憶體管理，那麼當MEMORY_TARGET的值大於/dev/shm的時候，就會報ORA-00845: MEMORY_TARGET not supported on this system錯誤，解決辦法增加/dev/shm大小，在redhat系列系統中，/dev/shm的預設值是系統總記憶體的一半

1、修改/dev/shm大小 [[email protected] ~]$  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 [

[email protected] ~]$   mount -o size=8G -o nr_inodes=1000000 -o noatime,nodiratime -o remount /dev/shm mount: only root can do that [[email protected] ~]$ su - Password:  [[email protected] ~]# mount -o size=8G -o nr_inodes=1000000 -o noatime,nodiratime -o remount /dev/shm [

[email protected] ~]# 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、啟動資料庫驗證： [[email protected] ~]$ export ORACLE_SID=test0924 [[email protected] ~]$ 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 3340451840 bytes Fixed Size                  2232960 bytes Variable Size            3204451712 bytes Database Buffers          117440512 bytes Redo Buffers               16326656 bytes Database mounted. Database opened. idle> conn /as sysdba Connected. [email protected]> show parameter mem   NAME                                 TYPE        VALUE ------------------------------------ ----------- ------------------------------ hi_shared_memory_address             integer     0 memory_max_target                    big integer 3200M memory_target                        big integer 0 shared_memory_address                integer     0   4、官方解析

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.

5、解決問題建議

5.1. If you are installing Oracle 11g on a Linux system, note that Memory Size (SGA and PGA), which sets the initialization parameter MEMORY_TARGET or MEMORY_MAX_TARGET, cannot be greater than the shared memory filesystem (/dev/shm) on your operating system. To resolve the current error, increase the /dev/shm file size.

5.2. If configuring AMM is not possible due to lack of space on /dev/shm mount point, you can configure ASMM instead of AMM, i.e. set SGA_TARGET, SGA_MAX_SIZE and PGA_AGGREGATE_TARGET instead of MEMORY_TARGET.

再分享一下我老師大神的人工智慧教程吧。零基礎！通俗易懂！風趣幽默！希望你也加入到我們人工智慧的隊伍中來！http://www.captainbed.net