打开虚拟机发现实例起不来
[root@wenxi ~]# su - oracle
sq[oracle@wenxi ~]$ sqlplus / as sysdba
SQL*Plus: Release 11.2.0.4.0 Production on Tue Aug 2 14:59:54 2016
Copyright (c) 1982, 2013, Oracle. All rights reserved.
Connected to an idle instance.
SYS@ odb>startup nomout
SP2-0714: invalid combination of STARTUP options
[oracle@wenxi ~]$ oerr ora 000845
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.
在oracle 11g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@wenxi ~]$ df -h /dev/shm/
Filesystem Size Used Avail Use% Mounted on
tmpfs 1.5G 72K 1.5G 1% /dev/shm
*.memory_target=1603272704 约为1.6G
解决办法是加大/dev/shm的空间
[oracle@wenxi ~]$ cat /etc/fstab | grep tmpfs
tmpfs /dev/shm tmpfs defaults 0 0
[root@wenxi ~]# mount -o remount,size=2G /dev/shm
[root@wenxi ~]# df -h /dev/shm/
Filesystem Size Used Avail Use% Mounted on
tmpfs 2.0G 72K 2.0G 1% /dev/shm
[root@wenxi ~]# vim /etc/fstab
tmpfs /dev/shm tmpfs defaults,size=2G
正常打开了
SYS@ odb>startup
ORACLE instance started.
Total System Global Area 1603411968 bytes
Fixed Size 2253664 bytes
Variable Size 989858976 bytes
Database Buffers 603979776 bytes
Redo Buffers 7319552 bytes
Database mounted.
Database opened.
