Oracle study之--“ORA-00845: MEMORY_TARGET not supported on this system"错误

Oracle study之--“ORA-00845: MEMORY_TARGET not supported on this system"错误

系统环境：

   操作系统：RedHat EL6(64)

   Oracle：    Oracle 11g R2

 

故障案例：

在Oracle 11gR2下调整内存参数：memory_target

SQL> show parameter memNAME                                 TYPE        VALUE------------------------------------ ----------- ------------------------------hi_shared_memory_address             integer     0memory_max_target                    big integer 400Mmemory_target                        big integer 400Mshared_memory_address                integer     0SQL> alter system set memory_max_target=1200m scope=spfile;System altered.SQL> alter system set memory_target=1200m scope=spfile;System altered.SQL> show parameter sgaNAME                                 TYPE        VALUE------------------------------------ ----------- ------------------------------lock_sga                             boolean     FALSEpre_page_sga                         boolean     FALSEsga_max_size                         big integer 400Msga_target                           big integer 0SQL> show parameter sharedNAME                                 TYPE        VALUE------------------------------------ ----------- ------------------------------hi_shared_memory_address             integer     0max_shared_servers                   integershared_memory_address                integer     0shared_pool_reserved_size            big integer 6710886shared_pool_size                     big integer 0shared_server_sessions               integershared_servers                       integer     1SQL> alter system set shared_pool_size=500m scope=spfile;System altered.SQL> show parameter javaNAME                                 TYPE        VALUE------------------------------------ ----------- ------------------------------java_jit_enabled                     boolean     TRUEjava_max_sessionspace_size           integer     0java_pool_size                       big integer 0java_soft_sessionspace_limit         integer     0SQL> alter system set java_pool_size=300m scope=spfile;System altered.

<strong>调整完成后，重新启动Instance：</strong>

SQL> startup force;
ORA-00845: MEMORY_TARGET not supported on this system
SQL> exit
Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

查看linux系统文件系统：
[oracle@rh6 dbs]$ df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda2              18G  5.2G   12G  32% /
tmpfs                 878M   72K  878M   1% /dev/shm
/dev/sda1             2.0G   62M  1.8G   4% /boot
/dev/sda3              12G  5.7G  5.4G  52% /u01
/dev/sda5             9.9G  4.9G  4.6G  52% /usr
/dev/sda7             4.2G  300M  3.7G   8% /var

---从以上可以看到，对于虚拟tmpfs的内存的文件系统，可用空间为878M，无法满足memory_target =1200M的内存需求

 

调整tmpfs：

<strong>[oracle@rh6 dbs]$ su -Password: [root@rh6 ~]# umount tmpfsumount: /dev/shm: device is busy.        (In some cases useful info about processes that use         the device is found by lsof(8) or fuser(1))</strong>

<strong>关闭和tmpfs相关的process：</strong>

<strong>[root@rh6 ~]# fuser -kc /dev/shm/dev/shm:             2204m</strong>

<strong>[root@rh6 ~]# umount tmpfs[root@rh6 ~]# mount  -t tmpfs shmfs -o size=1300m /dev/shm[root@rh6 ~]# df -hFilesystem            Size  Used Avail Use% Mounted on/dev/sda2              18G  5.2G   12G  32% //dev/sda1             2.0G   62M  1.8G   4% /boot/dev/sda3              12G  5.7G  5.4G  52% /u01/dev/sda5             9.9G  4.9G  4.6G  52% /usr/dev/sda7             4.2G  300M  3.7G   8% /varshmfs                 1.3G     0  1.3G   0% /dev/shm</strong>

<strong>修改fstab文件，当系统启动时mount tmpfs</strong>

<strong>[root@rh6 ~]# vi /etc/fstab## /etc/fstab# Created by anaconda on Sun Sep 29 16:52:59 2013## 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#UUID=85ffcaeb-1855-4f6a-b1af-d4e13d7b8850 /                       ext4    defaults        1 1UUID=0e7c052e-fc2a-402a-82cc-116e7629ef8f /boot                   ext4    defaults        1 2UUID=cf98cf21-ba1f-4a3a-aac3-43406dd5fca1 /u01                    ext4    defaults        1 2UUID=e3cf943c-48c4-4c4b-ba65-f11ba1f6a2e0 /usr                    ext4    defaults        1 2UUID=c5dd449a-ce22-4d47-a6d3-2d09c0186489 /var                    ext4    defaults        1 2UUID=e701d956-939e-441b-bad4-03b2057d4159 swap                    swap    defaults        0 0tmpfs                   /dev/shm                tmpfs    defaults,size=1300m        0 0devpts                  /dev/pts                devpts  gid=5,mode=620  0 0sysfs                   /sys                    sysfs   defaults        0 0proc                    /proc                   proc    defaults        0 0~[root@rh6 ~]# mount tmpfs[root@rh6 ~]# df -hFilesystem            Size  Used Avail Use% Mounted on/dev/sda2              18G  5.2G   12G  32% //dev/sda1             2.0G   62M  1.8G   4% /boot/dev/sda3              12G  5.7G  5.4G  52% /u01/dev/sda5             9.9G  4.9G  4.6G  52% /usr/dev/sda7             4.2G  300M  3.7G   8% /vartmpfs                 1.3G     0  1.3G   0% /dev/shm</strong>

<strong>验证：</strong>

<strong>[root@rh6 ~]# umount /dev/shm[root@rh6 ~]# df -hFilesystem            Size  Used Avail Use% Mounted on/dev/sda2              18G  5.2G   12G  32% //dev/sda1             2.0G   62M  1.8G   4% /boot/dev/sda3              12G  5.7G  5.4G  52% /u01/dev/sda5             9.9G  4.9G  4.6G  52% /usr/dev/sda7             4.2G  300M  3.7G   8% /var[root@rh6 ~]# mount tmpfs[root@rh6 ~]# df -hFilesystem            Size  Used Avail Use% Mounted on/dev/sda2              18G  5.2G   12G  32% //dev/sda1             2.0G   62M  1.8G   4% /boot/dev/sda3              12G  5.7G  5.4G  52% /u01/dev/sda5             9.9G  4.9G  4.6G  52% /usr/dev/sda7             4.2G  300M  3.7G   8% /vartmpfs                 1.3G     0  1.3G   0% /dev/shm[root@rh6 ~]# cat /etc/fstab## /etc/fstab# Created by anaconda on Sun Sep 29 16:52:59 2013## 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#UUID=85ffcaeb-1855-4f6a-b1af-d4e13d7b8850 /                       ext4    defaults        1 1UUID=0e7c052e-fc2a-402a-82cc-116e7629ef8f /boot                   ext4    defaults        1 2UUID=cf98cf21-ba1f-4a3a-aac3-43406dd5fca1 /u01                    ext4    defaults        1 2UUID=e3cf943c-48c4-4c4b-ba65-f11ba1f6a2e0 /usr                    ext4    defaults        1 2UUID=c5dd449a-ce22-4d47-a6d3-2d09c0186489 /var                    ext4    defaults        1 2UUID=e701d956-939e-441b-bad4-03b2057d4159 swap                    swap    defaults        0 0tmpfs                   /dev/shm                tmpfs    defaults,size=1300m        0 0devpts                  /dev/pts                devpts  gid=5,mode=620  0 0sysfs                   /sys                    sysfs   defaults        0 0proc                    /proc                   proc    defaults        0 0</strong>

<strong>[root@rh6 ~]# df -hFilesystem            Size  Used Avail Use% Mounted on/dev/sda2              18G  5.2G   12G  32% //dev/sda1             2.0G   62M  1.8G   4% /boot/dev/sda3              12G  5.7G  5.4G  52% /u01/dev/sda5             9.9G  4.9G  4.6G  52% /usr/dev/sda7             4.2G  300M  3.7G   8% /vartmpfs                 1.3G     0  1.3G   0% /dev/shm</strong>

重新启动Instance：

[oracle@rh6 ~]$ sqlplus '/as sysdba'

SQL*Plus: Release 11.2.0.3.0 Production on Thu Jun 25 11:34:39 2015

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

Connected to an idle instance.

SQL> startup
ORACLE instance started.

Total System Global Area 1252663296 bytes
Fixed Size                  2227944 bytes
Variable Size            1224737048 bytes
Database Buffers           16777216 bytes
Redo Buffers                8921088 bytes
Database mounted.
Database opened.