[20180211]11g关闭AMM.txt

--//指点别人的系统关闭AMM,使用hugepages遇到问题,主要问题是对方设置如下参数在spfile文件中:

*.memory_max_target=0

*.memory_target=0

--//通过例子说明:

1.环境:

SCOTT@book> @ &r/ver1

PORT_STRING                    VERSION        BANNER

------------------------------ -------------- --------------------------------------------------------------------------------

x86_64/Linux 2.4.xx            11.2.0.4.0     Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production

SYS@book> create pfile='/tmp/@.ora' from spfile;

File created.

--//修改 /tmp/book.ora 文件增加如下:

*.memory_max_target=0

*.memory_target=0

2.测试:

SYS@book> shutdown immediate

Database closed.

Database dismounted.

ORACLE instance shut down.

SYS@book> startup pfile='/tmp/book.ora'

ORA-27125: unable to create shared memory segment

SYS@book> startup nomount pfile='/tmp/book.ora'

ORA-27125: unable to create shared memory segment

SYS@book> create spfile from pfile='/tmp/book.ora';

File created.

SYS@book> startup

ORA-27125: unable to create shared memory segment

3.问题解决:

--//按照前面的方法建立pfile.

SYS@book> create pfile='/tmp/@.ora' from spfile;

File created.

--//删除*.memory_max_target=0,*.memory_target=0行,重新建立spfile:

SYS@book> create spfile from pfile='/tmp/book.ora';

File created.

SYS@book> startup

ORACLE instance started.

Total System Global Area  634732544 bytes

Fixed Size                  2255792 bytes

Variable Size             197133392 bytes

Database Buffers          427819008 bytes

Redo Buffers                7524352 bytes

Database mounted.

Database opened.

--//OK.

SYS@book> show parameter memory_%target

NAME              TYPE        VALUE

----------------- ----------- ------

memory_max_target big integer 0

memory_target     big integer 0

--//oracle到处都是坑...^_^.即使是0,也不能写在参数文件里面.