您好,登錄后才能下訂單哦!
前接天需要改一下Oracle的內(nèi)存參數(shù),本來oracle 裝機(jī)時(shí)候已經(jīng)配置好了sga 和pga的大小了,但是有好多問題隨之出現(xiàn)。linux 用的是16G內(nèi)存,sga 內(nèi)存12G,pga 4G,所以linux 系統(tǒng)很慢。 改打開連接數(shù): SQL>show parameter open_cursors; ---顯示參數(shù)值 SQL>alter system set open_cursors = 1000; ---修改參數(shù)值為1000 SQL>commit; ----提交 修改成功。 (轉(zhuǎn))Oracle 調(diào)整SGA、PGA大小 博客分類: Oracle SQL> show parameter sga; SQL> alter system set sga_max_size=4096M scope=spfile; System altered. SQL> alter system set sga_target=4096M scope=spfile; System altered. 如果是RAC環(huán)境,需要這樣增加sid='*': alter system set sga_target=20G scope=spfile sid='*'; 重啟使更改生效: SQL> shutdown immediate; Database closed. Database dismounted. ORACLE instance shut down. SQL> startup ORACLE instance started. Total System Global Area 4294967296 bytes Fixed Size 2026296 bytes Variable Size 805307592 bytes Database Buffers 3472883712 bytes Redo Buffers 14749696 bytes Database mounted. Database opened. SQL> show parameter sga; NAME TYPE VALUE ----------- ------------------------------ lock_sga boolean FALSE pre_page_sga boolean FALSE sga_max_size big integer 4G sga_target big integer 4G SQL> show parameter pga; 不用重啟DB,直接在線修改。 SQL> alter system set workarea_size_policy=auto scope=both; System altered. SQL> alter system set pga_aggregate_target=512m scope=both; System altered. SQL> show parameter workarea NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ workarea_size_policy string AUTO --這個(gè)設(shè)置成AUTO SQL> show parameter pga NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ pga_aggregate_target big integer 536870912 SELECT * FROM V$PGASTAT; aggregate PGA auto target 477379584 bytes --當(dāng)前可用于自動(dòng)分配了的PGA大小,應(yīng)該比PGA_AGGREGATE_TARGET 小 over allocation count 1118 --實(shí)例啟動(dòng)后,發(fā)生的分配次數(shù),如果這個(gè)值大于0,就要考慮增加pga的值 1 查看 SGA大小 show parameter sga_max_size db_cache_size的尺寸受 SGA的影響為能大于SGA 2 查看 show parameter shared_pool_size 尺寸 一般來說 shared_pool_size+db_cache_size=SGA_MAX_SIZE*70%左右 經(jīng)過計(jì)算再修改db_cache_size sql>alter system set db_cache_size= 大小M scope=spfile sid='數(shù)據(jù)庫SID'; sql>shutdown immediate sql>startup sql>show parameter db_cache_size 就可以看到修改后的效果了 [oracle@oracle_db ~]$ sqlplus / as sysdba SQL*Plus: Release 10.2.0.4.0 - Production on Wed Aug 5 21:56:47 2015 Copyright (c) 1982, 2007, Oracle. All Rights Reserved. Connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit Production With the Partitioning, OLAP, Data Mining and Real Application Testing options SQL> SQL> SQL> SQL> show parameter sga; NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ lock_sga boolean FALSE pre_page_sga boolean FALSE sga_max_size big integer 12G sga_target big integer 12G SQL> alter system set sga_max_size=10240M scope=spfile; System altered. SQL> alter system set sga_target=10240M scope=spfile; System altered. SQL> shutdown immediate; Database closed. Database dismounted. ORACLE instance shut down. SQL> startup ORACLE instance started. Total System Global Area 1.0737E+10 bytes Fixed Size 2101808 bytes Variable Size 1560284624 bytes Database Buffers 9160359936 bytes Redo Buffers 14671872 bytes Database mounted. Database opened. SQL> show parameter sga; NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ lock_sga boolean FALSE pre_page_sga boolean FALSE sga_max_size big integer 10G sga_target big integer 10G SQL> show parameter pga; SQL> alter system set workarea_size_policy=auto scope=both; System altered. SQL> alter system set pga_aggregate_target=2048m scope=both; System altered. SQL> show parameter workarea NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ workarea_size_policy string AUTO SQL> show parameter workarea NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ workarea_size_policy string AUTO SQL> show parameter pga; SQL> show parameter sga; NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ lock_sga boolean FALSE pre_page_sga boolean FALSE sga_max_size big integer 10G sga_target big integer 10G SQL> SQL> SQL> SQL> 最后的結(jié)果是改成sga 10G + pga 2G ,系統(tǒng)內(nèi)存 4G,swap 分區(qū) 內(nèi)存32G。 改后效果并不是很明顯,需要后續(xù)觀察
免責(zé)聲明:本站發(fā)布的內(nèi)容(圖片、視頻和文字)以原創(chuàng)、轉(zhuǎn)載和分享為主,文章觀點(diǎn)不代表本網(wǎng)站立場,如果涉及侵權(quán)請(qǐng)聯(lián)系站長郵箱:is@yisu.com進(jìn)行舉報(bào),并提供相關(guān)證據(jù),一經(jīng)查實(shí),將立刻刪除涉嫌侵權(quán)內(nèi)容。