时间：2021-07-01 10:21:17 帮助过：24人阅读
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：
[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 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>[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 -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>[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 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 ~ [root@rh6 ~]# mount tmpfs [root@rh6 ~]# 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>[root@rh6 ~]# umount /dev/shm [root@rh6 ~]# 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 [root@rh6 ~]# mount tmpfs [root@rh6 ~]# 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 [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 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>[root@rh6 ~]# 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：
[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.
Oracle study之--“ORA-00845: MEMORY_TARGET not supported on this system"错误
标签：oracle 11g