ORA-00824 cannot set SGA_TARGET or MEMORY_TARGET due to existing internal settin

ORA-00824: cannot set SGA_TARGET or MEMORY_TARGET due to existing internal settings
ORA-00842: DB_BLOCK_BUFFERS cannot be set with SGA_TARGET or MEMORY_TARGET
ORA-01034: ORACLE not available

E:\app\Administrator\product\11.2.0\dbhome_1\BIN>sqlplus /nolog
SQL*Plus: Release 11.2.0.1.0 Production on 星期三 1月 28 16:04:37 2015
Copyright (c) 1982, 2010, Oracle.  All rights reserved.
SQL> startup ;
ORA-01031: insufficient privileges
SQL> startup;
ORA-01031: insufficient privileges
SQL> conn / as sysdba;
已连接到空闲例程。
SQL> shutdown normal
ORA-01034: ORACLE not available
ORA-27101: shared memory realm does not exist
第 1 行出现错误:
ORA-01034: ORACLE not available
进程 ID: 0
会话 ID: 0 序列号: 0
SQL> startup pfile='E:\app\Administrator\admin\orcl\pfile\init.ora.216201423850'
;
ORACLE 例程已经启动。

Total System Global Area 5094195200 bytes
Fixed Size                  2184552 bytes
Variable Size            2684357272 bytes
Database Buffers         2399141888 bytes
Redo Buffers                8511488 bytes
数据库装载完毕。
数据库已经打开。
SQL> create spfile from pfile='E:\app\Administrator\admin\orcl\pfile\init.ora.216201423850';

文件已创建。

SQL> shutdown immediate
数据库已经关闭。
已经卸载数据库。
ORACLE 例程已经关闭。
SQL> startup
ORACLE 例程已经启动。
Total System Global Area 5094195200 bytes
Fixed Size                  2184552 bytes
Variable Size            2684357272 bytes
Database Buffers         2399141888 bytes
Redo Buffers                8511488 bytes
数据库装载完毕。
数据库已经打开。
SQL>