Oracle 修改 MEMORY_TARGET，内存减小导致ORACLE启动不了，扩展内存后，按pfile启动，但sfile修改不了。
1.内存减小导致Oracle启动不了
Last login: Sun Nov 4 15:09:06 2012 from 192.168.5.222
[oracle@h1 ~]$ sqlplus "/as SYSDBA"
SQL*Plus: Release 11.2.0.1.0 Production on Sun Nov 4 15:26:59 2012
Copyright (c) 1982, 2009, Oracle. All rights reserved.
Connected to an idle instance.
SQL> startup pfile=/app/oracle/admin/orcl/pfile/init.ora.103201271612
ORA-00845: MEMORY_TARGET not supported on this system
SQL> shutdown abort
ORACLE instance shut down.
SQL> startup pfile=/app/oracle/admin/orcl/pfile/init.ora.103201271612 force
ORA-00845: MEMORY_TARGET not supported on this system
SQL> exit
Disconnected
#---------解决：扩展内存
#--------pfile位置：$ORACLE_BASE/admin/[$ORACLE_SID]/pfile/init.ora.*
2.扩展内存后，按pfile启动，，但sfile修改不了
SQL*Plus: Release 11.2.0.1.0 Production on Sun Nov 4 16:00:25 2012
Copyright (c) 1982, 2009, Oracle. All rights reserved.
Connected to an idle instance.
SQL> startup pfile=/app/oracle/admin/orcl/pfile/init.ora.103201271612 force
ORACLE instance started.
#----------按ORACLE PFILE 启动
Total System Global Area 1219260416 bytes
Fixed Size 2212856 bytes
Variable Size 738200584 bytes
Database Buffers 469762048 bytes
Redo Buffers 9084928 bytes
Database mounted.
Database opened.
SQL> alter system set memory_max_target=1258200M scope=both;
alter system set memory_max_target=1258200M scope=both
*
ERROR at line 1:
ORA-02095: specified initialization parameter cannot be modified
SQL> alter system set memory_max_target=1258200M scope=spfile;
alter system set memory_max_target=1258200M scope=spfile
*
ERROR at line 1:
ORA-32001: write to SPFILE requested but no SPFILE is in use//spfile文件可能不存在
#-------------/app/oracle/product/11.2.0/dbhome_2/dbs/----------------存放spfile
