Oracle11gSGA調(diào)整方法

oracle11g修改sga要先修改memory_target等參數(shù)，否則服務重啟時會出現(xiàn)錯誤ORA-00844: Parameter not taking MEMORY_TARGET into account, see alert log for mo

re information。

Oracle內(nèi)存參數(shù)結構：

修改SGA必須保持的原則：
1.sga_target不能大于sga_max_size，可以設置為相等。
2.SGA加上PGA等其他進程占用的內(nèi)存總數(shù)必須小于操作系統(tǒng)的物理內(nèi)存。

具體命令操作如下：

C:UsersAdministrator>sqlplus/nologSQL*Plus: Release 11.1.0.6.0 - Production on 星期三 2月 22 10:51:08 2012Copyright (c) 1982, 2007, Oracle.  All rights reserved.SQL> conn sys/sys as sysdba;已連接。SQL> show sga;Total System Global Area  631926784 bytesFixed Size  1334996 bytesVariable Size     205521196 bytesDatabase Buffers  419430400 bytesRedo Buffers5640192 bytesSQL> alter system set memory_max_target=700m scope=spfile;系統(tǒng)已更改。SQL> alter system set memory_target=700m scope=spfile;系統(tǒng)已更改。SQL> show sga;Total System Global Area  631926784 bytesFixed Size  1334996 bytesVariable Size     205521196 bytesDatabase Buffers  419430400 bytesRedo Buffers5640192 bytesSQL> shutdown immediate;數(shù)據(jù)庫已經(jīng)關閉。已經(jīng)卸載數(shù)據(jù)庫。ORACLE 例程已經(jīng)關閉。SQL> startup;ORACLE 例程已經(jīng)啟動。Total System Global Area  631926784 bytesFixed Size  1334996 bytesVariable Size     205521196 bytesDatabase Buffers  419430400 bytesRedo Buffers5640192 bytes數(shù)據(jù)庫裝載完畢。數(shù)據(jù)庫已經(jīng)打開。SQL> alter system set sga_target=650m scope=spfile;系統(tǒng)已更改。SQL> alter system set sga_max_size=650m scope=spfile;系統(tǒng)已更改。SQL> shutdown immediate;數(shù)據(jù)庫已經(jīng)關閉。已經(jīng)卸載數(shù)據(jù)庫。ORACLE 例程已經(jīng)關閉。SQL> startup;ORACLE 例程已經(jīng)啟動。Total System Global Area  686329856 bytesFixed Size  1335360 bytesVariable Size     205524928 bytesDatabase Buffers  473956352 bytesRedo Buffers5513216 bytes數(shù)據(jù)庫裝載完畢。數(shù)據(jù)庫已經(jīng)打開。SQL> show sga;Total System Global Area  686329856 bytesFixed Size  1335360 bytesVariable Size     205524928 bytesDatabase Buffers  473956352 bytesRedo Buffers5513216 bytes

附：ora-00844錯誤解決辦法：

SQL> create pfile='c:inittest.ora' from spfile;
文件已創(chuàng)建。

(手動修改文件中對應的memory_target參數(shù))

SQL> startup pfile="c:inittest.ora";ORACLE 例程已經(jīng)啟動。Total System Global Area  631926784 bytesFixed Size  1334996 bytesVariable Size     205521196 bytesDatabase Buffers  419430400 bytesRedo Buffers5640192 bytes數(shù)據(jù)庫裝載完畢。數(shù)據(jù)庫已經(jīng)打開。SQL> create spfile from pfile="c:inittest.ora";文件已創(chuàng)建。SQL> shutdown immediate;數(shù)據(jù)庫已經(jīng)關閉。已經(jīng)卸載數(shù)據(jù)庫。ORACLE 例程已經(jīng)關閉。SQL> startup;ORACLE 例程已經(jīng)啟動。Total System Global Area  631926784 bytesFixed Size  1334996 bytesVariable Size     205521196 bytesDatabase Buffers  419430400 bytesRedo Buffers5640192 bytes數(shù)據(jù)庫裝載完畢。數(shù)據(jù)庫已經(jīng)打開。

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