ORA-00845: MEMORY_TARGET not supported on this system
2014-06-20 20:36
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描述:新配置了一台虚拟机,安装有ORACLE11gR1,数据库startup报错:
SQL> startup
ORA-00845: MEMORY_TARGET not supported on this system
问题原因:
oracle@DG2 ~]$ oerr ora 00845
00845, 00000, "MEMORY_TARGET not supported on this system"
// *Cause: The MEMORY_TARGET parameter was not supported on this operating system or /dev/shm was not sized correctly on Linux.
// *Action: Refer to documentation for a list of supported operating systems. Or, size /dev/shm to be at least the SGA_MAX_SIZE on each Oracle instance running on the system. For ASM instances, set MEMORY_TARGET explicitly to 0 if /dev/shm cannot be configured.
在oracle11g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。
Oracle SGA的大小超过了系统shm的大小。
本身shm大小应该是系统分配的默认,随着物理内存的大小自动调节。如果不静态设置当物理内存发生变化时,tmfs也会变化,有可能导致Oracle SGA的大小超过了系统shm的大小的情况,出现ORA-00845的错误。
查看当前shm的大小:
[root@DG2 ~]# df -h
文件系统 容量 已用 可用 已用% 挂载点
/dev/sda3 16G 2.8G 12G 19% /
/dev/sda2 21G 5.7G 14G 30% /oracle
/dev/sda1 99M 12M 83M 13% /boot
tmpfs 901M 0 901M 0% /dev/shm
解决办法:
一、修改shm的大小;二、修改memory_max_target 大小
在物理内存充足的情况下,我们当然应该修改shm的大小:
[root@DG2 ~]# vi /etc/fstab
将tmpfs 一项从
tmpfs /dev/shm tmpfs defaults 0 0
改为
tmpfs /dev/shm tmpfs defaults,size=1G 0 0
保存后退出,重新挂载一下
[root@DG2 ~]# umount /dev/shm
[root@DG2 ~]# mount /dev/shm
[root@DG2 ~]# df -h
文件系统 容量 已用 可用 已用% 挂载点
/dev/sda3 16G 2.8G 12G 19% /
/dev/sda2 21G 5.7G 14G 30% /oracle
/dev/sda1 99M 12M 83M 13% /boot
tmpfs 1.0G 0 1.0G 0% /dev/shm
再启动数据库就没有问题了,当然值可以改的更大一些。
SQL> startup
ORA-00845: MEMORY_TARGET not supported on this system
问题原因:
oracle@DG2 ~]$ oerr ora 00845
00845, 00000, "MEMORY_TARGET not supported on this system"
// *Cause: The MEMORY_TARGET parameter was not supported on this operating system or /dev/shm was not sized correctly on Linux.
// *Action: Refer to documentation for a list of supported operating systems. Or, size /dev/shm to be at least the SGA_MAX_SIZE on each Oracle instance running on the system. For ASM instances, set MEMORY_TARGET explicitly to 0 if /dev/shm cannot be configured.
在oracle11g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。
Oracle SGA的大小超过了系统shm的大小。
本身shm大小应该是系统分配的默认,随着物理内存的大小自动调节。如果不静态设置当物理内存发生变化时,tmfs也会变化,有可能导致Oracle SGA的大小超过了系统shm的大小的情况,出现ORA-00845的错误。
查看当前shm的大小:
[root@DG2 ~]# df -h
文件系统 容量 已用 可用 已用% 挂载点
/dev/sda3 16G 2.8G 12G 19% /
/dev/sda2 21G 5.7G 14G 30% /oracle
/dev/sda1 99M 12M 83M 13% /boot
tmpfs 901M 0 901M 0% /dev/shm
解决办法:
一、修改shm的大小;二、修改memory_max_target 大小
在物理内存充足的情况下,我们当然应该修改shm的大小:
[root@DG2 ~]# vi /etc/fstab
将tmpfs 一项从
tmpfs /dev/shm tmpfs defaults 0 0
改为
tmpfs /dev/shm tmpfs defaults,size=1G 0 0
保存后退出,重新挂载一下
[root@DG2 ~]# umount /dev/shm
[root@DG2 ~]# mount /dev/shm
[root@DG2 ~]# df -h
文件系统 容量 已用 可用 已用% 挂载点
/dev/sda3 16G 2.8G 12G 19% /
/dev/sda2 21G 5.7G 14G 30% /oracle
/dev/sda1 99M 12M 83M 13% /boot
tmpfs 1.0G 0 1.0G 0% /dev/shm
再启动数据库就没有问题了,当然值可以改的更大一些。
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