Oracle 11G： 生成PFILE文件： create pfile='/home/oracle/initorcl.ora' from spfile;
修改PFILE中的*.memory_target=536870912 值。
然后重启数据库从新的PFILE文件启动到NOMOUNT状态。
SQL> startup nomount pfile='/home/oracle/initorcl.ora';
ORA-00845: MEMORY_TARGET not supported on this system
原因是这个值大过了/dev/shm的值。
df -k /dev/shm
Filesystem 1K-blocks Used Available Use% Mounted on
tmpfs 517600 0 517600 0% /dev/shm
解决方法：
修改FSTAB
vi /etc/fstab
/dev/VolGroup00/LogVol00 / ext3 defaults 1 1
LABEL=/boot /boot ext3 defaults 1 2
tmpfs /dev/shm tmpfs defaults,size=1024m 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
sysfs /sys sysfs defaults 0 0
proc /proc proc defaults 0 0
/dev/VolGroup00/LogVol01 swap swap defaults 0 0
重新挂载：
[root@localhost ~]# umount /dev/shm
[root@localhost ~]# mount /dev/shm
[root@localhost ~]# df -h /dev/shm
Filesystem Size Used Avail Use% Mounted on
tmpfs 1.0G 0 1.0G 0% /dev/shm
再次启动数据库
SQL> startup pfile='/home/oracle/initorcl.ora';
ORACLE instance started.
Total System Global Area 535662592 bytes
Fixed Size 1337720 bytes
Variable Size 327157384 bytes
Database Buffers 201326592 bytes
Redo Buffers 5840896 bytes
Database mounted.
Database opened.
SQL> show sga
Total System Global Area 535662592 bytes
Fixed Size 1337720 bytes
Variable Size 327157384 bytes
Database Buffers 201326592 bytes
Redo Buffers 5840896 bytes
SQL> select 535662592/1024/1024 from dual;
535662592/1024/1024
-------------------
510.847656
可 以看到已经修改过来了。
最后验证同步功能。