1）查看当前memory_target，memory_max_target参数值
SQL> show parameter target
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
archive_lag_target integer 0
db_flashback_retention_target integer 1440
fast_start_io_target integer 0
fast_start_mttr_target integer 0
memory_max_target big integer 728M
memory_target big integer 728M
parallel_servers_target integer 16
pga_aggregate_target big integer 0
sga_target big integer 0
2）创建文本参数文件pfile
SQL> create pfile='/home/oracle/orcl.ora' from spfile;
File created.
3）把memory_target，memory_max_target从pfile删除
[oracle@oracle11g ~]$ vi orcl.ora
orcl.__db_cache_size=318767104
orcl.__java_pool_size=4194304
orcl.__large_pool_size=8388608
orcl.__oracle_base='/u01/app/oracle'#ORACLE_BASE set from environment
orcl.__pga_aggregate_target=306184192
orcl.__sga_target=457179136
orcl.__shared_io_pool_size=0
orcl.__shared_pool_size=117440512
orcl.__streams_pool_size=0
*.audit_file_dest='/u01/app/oracle/admin/orcl/adump'
*.audit_trail='db'
*.compatible='11.2.0.4.0'
*.control_files='/u01/app/oracle/oradata/orcl/control01.ctl','/u01/app/oracle/fast_recovery_area/orcl/control02.ctl'
*.db_block_size=8192
*.db_domain=''
*.db_name='ORCL'#Reset to original value by RMAN
*.db_recovery_file_dest_size=4385144832
*.db_recovery_file_dest='/home/oracle/archivelog'
*.diagnostic_dest='/u01/app/oracle'
*.dispatchers='(PROTOCOL=TCP) (SERVICE=orclXDB)'
*.open_cursors=300
*.processes=150
*.remote_login_passwordfile='EXCLUSIVE'
*.undo_tablespace='UNDOTBS1'
4）关闭当前数据库，使用修改后的pfile创建spfile，并且用spfile启动数据库
SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> create spfile from pfile='/home/oracle/orcl.ora';
File created.
SQL> startup
ORACLE instance started.
Total System Global Area 221331456 bytes
Fixed Size 2251856 bytes
Variable Size 163578800 bytes
Database Buffers 50331648 bytes
Redo Buffers 5169152 bytes
Database mounted.
Database opened.
SQL> show parameter target
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
archive_lag_target integer 0
db_flashback_retention_target integer 1440
fast_start_io_target integer 0
fast_start_mttr_target integer 0
memory_max_target big integer 0
memory_target big integer 0
parallel_servers_target integer 4
pga_aggregate_target big integer 10M
sga_target big integer 0
5）修改sga_target，sga_max_size，pga_aggregate_target参数
SQL> alter system set sga_target=580m scope=spfile;
System altered.
SQL> alter system set sga_max_size=580m scope=spfile;
System altered.
SQL> alter system set pga_aggregate_target=116m scope=spfile;
System altered.
6）重启数据库使参数生效
SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup
ORACLE instance started.
Total System Global Area 605450240 bytes
Fixed Size 2255632 bytes
Variable Size 230687984 bytes
Database Buffers 369098752 bytes
Redo Buffers 3407872 bytes
Database mounted.
Database opened.
SQL> show parameter target
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
archive_lag_target integer 0
db_flashback_retention_target integer 1440
fast_start_io_target integer 0
fast_start_mttr_target integer 0
memory_max_target big integer 0
memory_target big integer 0
parallel_servers_target integer 16
pga_aggregate_target big integer 116M
sga_target big integer 580M
SQL>
SQL> show parameter sga
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
lock_sga boolean FALSE
pre_page_sga boolean FALSE
sga_max_size big integer 580M
sga_target big integer 580M
SQL> show parameter pga
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
pga_aggregate_target big integer 116M
