ORACLE_修改实例的内存大小
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注:本文来源于:星火spark 《Oracle的实例占用内存调整》
ORACLE_修改实例的内存大小
一:修改oracle数据库实例内存大小脚本
1 ---- 1、操作 (oracle使用内存约等于 SGA+PGA,所以可以减少SGA与PGA解决你的问题,生产库慎用) 2 alter system set sga_max_size=100m scope=spfile; --减少SGA大小,静态参数,重启后生效 3 alter system set sga_target=80m scope=both; --动态参数;oracle推荐:启动时修改此参数,不要动态设置此参数 4 alter system set pga_aggregate_target=40m sope=both; ---减少pga大小
二:知识点拓展:
SGA_MAX_SIZE的大小不是随意指定的,必须满足一定条件的。
sga_max_size=100M,必须满足SGA所有组件的最小和;至少满足db_cache_size,log_buffer,shared_pool_size,large_pool_size,java_pool_size总和的大小)
1 oracle内存结构介绍: 2 Introduction to Oracle Memory Structures 3 Oracle uses memory to store information such as the following: 4 5 Program code 6 Information about a connected session, even if it is not currently active 7 Information needed during program execution (for example, the current state of a query from which rows are being fetched) 8 Information that is shared and communicated among Oracle processes (for example, locking information) 9 Cached data that is also permanently stored on peripheral memory (for example, data blocks and redo log entries) 10 The basic memory structures associated with Oracle include: 11 System Global Area (SGA), which is shared by all server and background processes. 12 Program Global Areas (PGA), which is private to each server and background process; there is one PGA for each process. 13 14 1.sqlplus “/ as sysdba" 2. 3.create pfile=\'d:/cj.ora\' from spfile; 然后去你的oracle安装目录 15 找一个init数据库名。ora这样一个文件 16 17 把几个oracle内存参数改小点 18 19 一个2G的内存是如下配置的: 20 21 *.sga_max_size=712M 22 23 *.large_pool_size=8M 24 25 *.shared_pool_size=250M 26 27 *.sort_area_size=0.5M 28 29 *.db_cache_size=350M 30 31 然后shutdown数据库 32 33 1.shutdown immediate; 2. 3.create spfile from pfile=\'d:/cj2.ora\'; 4. 5.startup; 然后启动,就可以了。 34 35 以上就是调整oracle内存参数,减少数据库内存占用的方法介绍。
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