ORA-00845: MEMORY_TARGET not supported on this system

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ORA-00845: MEMORY_TARGET not supported on this system

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、错误重现

SQL>SELECT * FROM V$VERSION;

BANNER

——————————————————————————–

Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 – Production

PL/SQL Release 11.2.0.3.0 – Production

CORE 11.2.0.3.0 Production

TNS for Linux: Version 11.2.0.3.0 – Production

NLSRTL Version 11.2.0.3.0 – Production

SQL>show parameter memory;

NAME TYPE VALUE

———————————— ———– ——————————

hi_shared_memory_address integer 0

memory_max_target big integer 500M

memory_target big integer 500M

shared_memory_address integer 0

SQL>alter system set memory_max_target=800m scope=spfile;



System altered.

SQL>alter system set memory_target=800m scope=spfile;



System altered.

SQL>shutdown immediate;

Database closed.

Database dismounted.

ORACLE instance shut down.

SQL>exit

Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 – Production

With the Partitioning, OLAP, Data Mining and Real Application Testing options

[oracle@xifenfei admin]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.3.0 Production on Sat Nov 5 19:01:18 2011

Copyright (c) 1982, 2011, Oracle. All rights reserved.

Connected to an idle instance.

SQL>startup

ORA-00845: MEMORY_TARGET not supported on this system

SQL>!oerr ora 845

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.

2、修改/dev/shm大小

[root@xifenfei ~]# df -h

Filesystem Size Used Avail Use% Mounted on

/dev/mapper/vg_xifenfei-lv_root

17G 13G 3.9G 77% /

tmpfs 590M 0 590M 0% /dev/shm

/dev/sda1 485M 30M 430M 7% /boot

[root@xifenfei ~]# mount -o size=900M -o nr_inodes=1000000 -o noatime,nodiratime -o remount /dev/shm

[root@xifenfei ~]# df -h

Filesystem Size Used Avail Use% Mounted on

/dev/mapper/vg_xifenfei-lv_root

17G 13G 3.9G 77% /

tmpfs 900M 0 900M 0% /dev/shm

/dev/sda1 485M 30M 430M 7% /boot

[root@xifenfei ~]# vi /etc/fstab

#

# /etc/fstab

# Created by anaconda on Sat Nov 5 02:49:30 2011

#

# Accessible filesystems, by reference, are maintained under '/dev/disk'

# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info

#

/dev/mapper/vg_xifenfei-lv_root / ext4 defaults 1 1

UUID=7ace6c04-d232-43ac-9ef5-70ea92fe49bd /boot ext4 defaults 1 2

/dev/mapper/vg_xifenfei-lv_swap swap swap defaults 0 0

tmpfs /dev/shm tmpfs defaults,size=900M 0 0

devpts /dev/pts devpts gid=5,mode=620 0 0

sysfs /sys sysfs defaults 0 0

proc /proc proc defaults 0 0

3、启动数据库验证

[oracle@xifenfei admin]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.3.0 Production on Sat Nov 5 19:03:51 2011

Copyright (c) 1982, 2011, Oracle. All rights reserved.

Connected to:

Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 – Production

With the Partitioning, OLAP, Data Mining and Real Application Testing options

sys@XFF>show parameter memory;

NAME TYPE VALUE

———————————— ———– ——————————

hi_shared_memory_address integer 0

memory_max_target big integer 800M

memory_target big integer 800M

shared_memory_address integer 0

4、官方解释

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、解决问题建议

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.

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此条目发表在 ORA-xxxxx 分类目录，贴了 ORA-00845 标签。将固定链接加入收藏夹。

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《ORA-00845: MEMORY_TARGET not supported on this system》有 1 条评论

在redhat6中，修改了fstab中修改后，不能生效，需要重新挂载

vi /etc/fstab

tmpfs /dev/shm tmpfs defaults,size=900M 0 0

vi /etc/rc.local

mount -o remount /dev/shm

若umount /dev/shm 提示device is busy，可用fuser -km /dev/shm后再umount、mount .

# umount /dev/shm/

# mount /dev/shm/

由于kill了/dev/shm的进程，可能造成ASM的启动后，一些磁盘组不能自动挂载，造成启动库时报错

[grid@rac1 ~]$ sqlplus / as sysasm

SQL> select name,state,offline_disks from v$asm_diskgroup;

SQL> alter diskgroup DATA mount;

SQL> select name,state,offline_disks from v$asm_diskgroup;