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 mem NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ hi_shared_memory_address integer 0 memory_max_target big integer 400M memory_target big integer 400M shared_memory_address integer 0 SQL> 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 sga NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ lock_sga boolean FALSE pre_page_sga boolean FALSE sga_max_size big integer 400M sga_target big integer 0 SQL> show parameter shared NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ hi_shared_memory_address integer 0 max_shared_servers integer shared_memory_address integer 0 shared_pool_reserved_size big integer 6710886 shared_pool_size big integer 0 shared_server_sessions integer shared_servers integer 1 SQL> alter system set shared_pool_size=500m scope=spfile; System altered. SQL> show parameter java NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ java_jit_enabled boolean TRUE java_max_sessionspace_size integer 0 java_pool_size big integer 0 java_soft_sessionspace_limit integer 0 SQL> 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：
[[email protected] 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>[[email protected] dbs]$ su -
Password:
[[email protected] ~]# umount tmpfs
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))
</strong>
<strong>关闭和tmpfs相关的process：</strong>
<strong>[[email protected] ~]# fuser -kc /dev/shm /dev/shm: 2204m </strong>
<strong>[[email protected] ~]# umount tmpfs [[email protected] ~]# mount -t tmpfs shmfs -o size=1300m /dev/shm [[email protected] ~]# df -h Filesystem 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 shmfs 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>[[email protected] ~]# 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 1 UUID=0e7c052e-fc2a-402a-82cc-116e7629ef8f /boot ext4 defaults 1 2 UUID=cf98cf21-ba1f-4a3a-aac3-43406dd5fca1 /u01 ext4 defaults 1 2 UUID=e3cf943c-48c4-4c4b-ba65-f11ba1f6a2e0 /usr ext4 defaults 1 2 UUID=c5dd449a-ce22-4d47-a6d3-2d09c0186489 /var ext4 defaults 1 2 UUID=e701d956-939e-441b-bad4-03b2057d4159 swap swap defaults 0 0 tmpfs /dev/shm tmpfs defaults,size=1300m 0 0 devpts /dev/pts devpts gid=5,mode=620 0 0 sysfs /sys sysfs defaults 0 0 proc /proc proc defaults 0 0 ~ [[email protected] ~]# mount tmpfs [[email protected] ~]# df -h Filesystem 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 tmpfs 1.3G 0 1.3G 0% /dev/shm </strong>
<strong>验证：</strong>
<strong>[[email protected] ~]# umount /dev/shm [[email protected] ~]# df -h Filesystem 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 [[email protected] ~]# mount tmpfs [[email protected] ~]# df -h Filesystem 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 tmpfs 1.3G 0 1.3G 0% /dev/shm [[email protected] ~]# 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 1 UUID=0e7c052e-fc2a-402a-82cc-116e7629ef8f /boot ext4 defaults 1 2 UUID=cf98cf21-ba1f-4a3a-aac3-43406dd5fca1 /u01 ext4 defaults 1 2 UUID=e3cf943c-48c4-4c4b-ba65-f11ba1f6a2e0 /usr ext4 defaults 1 2 UUID=c5dd449a-ce22-4d47-a6d3-2d09c0186489 /var ext4 defaults 1 2 UUID=e701d956-939e-441b-bad4-03b2057d4159 swap swap defaults 0 0 tmpfs /dev/shm tmpfs defaults,size=1300m 0 0 devpts /dev/pts devpts gid=5,mode=620 0 0 sysfs /sys sysfs defaults 0 0 proc /proc proc defaults 0 0</strong>
<strong>[[email protected] ~]# df -h Filesystem 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 tmpfs 1.3G 0 1.3G 0% /dev/shm </strong>
重新启动Instance：
[[email protected] ~]$ 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.