oracle启动错误ORA-00845

蔚落 2022-05-10 01:56 175阅读 0赞

启动Oracle 11gR2后报错：ORA-00845  
   
> sqlplus / as sysdba;  
SQL\*Plus: Release 11.2.0.3.0 Production onTue Feb 14 09:11:41 2012  
   
Copyright (c) 1982, 2011, Oracle.  All rights reserved.  
   
Connected to an idle instance.  
   
SQL> startup  
ORA-00845: MEMORY\_TARGET not supported onthis system  
   
这个错误之前已经处理过，因为tmpfs的大小MEMORY\_TARGET的设置，就会报这种错误。  
   
rac1:/home/oracle> oerr ora 845  
00845, 00000, "MEMORY\_TARGET notsupported on this system"  
// \*Cause: The MEMORY\_TARGET parameter wasnot supported on this operating system or /dev/shm was not sized correctly onLinux.  
// \*Action: Refer to documentation for alist of supported operating systems. Or, size /dev/shm to be at least theSGA\_MAX\_SIZE on each Oracle instance running on the system.  
   
验证一下：  
SQL> conn / as sysdba;  
Connected to an idle instance.  
SQL> startup mount;  
ORACLE instance started.  
   
Total System Global Area 1402982400 bytes  
Fixed Size                  2228304 bytes  
Variable Size             822087600 bytes  
Database Buffers          570425344 bytes  
Redo Buffers                8241152 bytes  
Database mounted.  
SQL> show parameter memory\_target  
   
NAME                                 TYPE        VALUE  
\----------------------------------------------- ------------------------------  
memory\_target                        big integer 1344M  
\--这里的memory\_target 有1344M。  
   
\[root@rac1 ~\]\# df -lh  
Filesystem            Size  Used Avail Use% Mounted on  
/dev/sda3              14G   11G 2.4G  83% /  
tmpfs                 978M   88K 978M   1% /dev/shm  
/dev/sda1             194M   46M 139M  25% /boot  
\--这里可以看到tmpfs 只有978M。 这个参数我在安装DB的时候已经修改过：  
   
\[root@rac1 ~\]\# cat /etc/fstab  
UUID=b1d2de8e-de31-4deb-b4e8-755c0ed01616/                       ext4    defaults        1 1  
UUID=4df5aa5f-8ef0-473a-931a-51d11e21aa53/boot                   ext4    defaults        1 2  
UUID=82085104-5021-4aaf-8e85-f213998107b6swap                    swap    defaults        0 0  
tmpfs                   /dev/shm                tmpfs   defaults,size=3G    0 0  
devpts                  /dev/pts                devpts  gid=5,mode=620  0 0  
sysfs                   /sys                    sysfs   defaults        0 0  
proc                    /proc                   proc    defaults        0 0  
\--只是这里的配置在启动的时候没有生效。具体配置参考：   
\[INS-35172\]Target database memory (XXMB) exceeds the systems available shared memory (\{0\}MB)解决方法  
http://blog.csdn.net/tianlesoftware/article/details/6896614  
   
\--把tmpfs 重新mount 一下：  
\[root@rac1 ~\]\# umount /dev/shm  
umount: /dev/shm: device is busy.  
       (In some cases useful info about processes that use  
        the device is found by lsof(8) or fuser(1))  
   
Linux umount报device is busy 的处理方法  
http://blog.csdn.net/tianlesoftware/article/details/6194295  
   
\--设备忙，用fuser处理一下：  
\[root@rac1 ~\]\# fuser -km /dev/shm  
/dev/shm:             1805m  
\[root@rac1 ~\]\# umount /dev/shm  
\[root@rac1 ~\]\# mount /dev/shm  
\[root@rac1 ~\]\# df -lh  
Filesystem            Size  Used Avail Use% Mounted on  
/dev/sda3              14G   11G 2.4G  83% /  
/dev/sda1             194M   46M 139M  25% /boot  
tmpfs                 3.0G     0 3.0G   0% /dev/shm  
\--现在已经正常了。