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Oracle 修改 SGA 大小
阅读量:548 次
发布时间:2019-03-09

本文共 746 字,大约阅读时间需要 2 分钟。

示例:将 SGA 由 2G 修改为 32G

方式一、通过 spfile 修改

1)使用SYS用户以SYSDBA身份登录系统

$ sqlplus / as sysdba

2)查询 memory_target 参数

在这里插入图片描述

3)执行命令修改如下参数

SQL>alter system set sga_max_size=32G scope=spfile;SQL>alter system set sga_target=32G scope=spfile;

注:alter system set sga_target=1600m scope=spfile;后面必须要加scope=spfile,指定修改Spfile。否则会报“无法修改初始化参数”的错。

4)重启数据库使修改生效

SQL> shutdown immediate;SQL> startup ;

方式二、通过 pfile 参数修改

1)创建 pfile

SQL>create pfile from spfile;

默认存放路径为: $ORACLE_HOME/dbs

2)修改 pfile 内容

$ vi INITorcl.ORA  //假设 1)中生成的 pfle 文件名为INITorcl.ORA

修改后主要内容为

sga_target=34359738368(32G)lock_sga=truepga_aggregate_tagert=250000000(250M左右)workarea_size_policy=autopre_page_sga=truesga_max_size=34359738368(32G)

3)用 pfile 启动数据库

SQL>startup pfile='$ORACLE_HOME/dbs/INITorcl.ORA'

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