Oracle修改内存使用情况

[oracle@pamiddle ~]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.4.0 Production on Tue Dec 15 10:33:08 2015

Copyright (c) 1982, 2013, Oracle.  All rights reserved.


Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL> show parameter memory

NAME      TYPE VALUE
------------------------------------ ----------- ------------------------------
hi_shared_memory_address      integer 0
memory_max_target      big integer 1584M
memory_target      big integer 1584M
shared_memory_address      integer 0
SQL> show parameter sga

NAME      TYPE VALUE
------------------------------------ ----------- ------------------------------
lock_sga      boolean FALSE
pre_page_sga      boolean FALSE
sga_max_size      big integer 1584M
sga_target      big integer 0
SQL> show parameter pga

NAME      TYPE VALUE
------------------------------------ ----------- ------------------------------
pga_aggregate_target      big integer 0
SQL> alter system set sga_max_size=512m scope=spfile;

System altered.

SQL> alter system set memory_target=512m scope=spfile;              

System altered.

SQL> alter system set memory_max_target=1024m scope=spfile;

System altered.

SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup
ORACLE instance started.

Total System Global Area  534462464 bytes
Fixed Size     2254952 bytes
Variable Size   390072216 bytes
Database Buffers   134217728 bytes
Redo Buffers     7917568 bytes
Database mounted.
Database opened.

SQL> show parameter memory

NAME      TYPE VALUE
------------------------------------ ----------- ------------------------------
hi_shared_memory_address      integer 0
memory_max_target      big integer 1G
memory_target      big integer 512M
shared_memory_address      integer 0

SQL> show parameter sga

NAME      TYPE VALUE
------------------------------------ ----------- ------------------------------
lock_sga      boolean FALSE
pre_page_sga      boolean FALSE
sga_max_size      big integer 512M
sga_target      big integer 0

SQL> show parameter pga

NAME      TYPE VALUE
------------------------------------ ----------- ------------------------------
pga_aggregate_target      big integer 0




【 注】: sga_max_size不能大于memory_target，不然数据库启动失败。