轻松掌握一些清内存对象及转储的常用命令

来源:岁月联盟 编辑:zhuzhu 时间:2008-01-28

一些清内存对象及转储的实用命令:

Oracle 9i清buffer cache

alter session set events 'immediate trace name flush_cache level 1';alter session set events = 'immediate trace name flush_cache';

Oracle 10g中清buffer cache

alter system flush buffer_cache

清shared pool

alter system flush shared_pool;

转储sga

alter session set events 'immediate trace name heapdump level 2';

转储library cache

ALTER SESSION SET EVENTS 'immediate trace name LIBRARY_CACHE level n';

Level =1 ,转储Library cache统计信息

Level =2 ,转储hash table概要

Level =4 ,转储Library cache对象,只包含基本信息

Level =8 ,转储Library cache对象,包含具体信息(包括child references,pin waiters等)

Level =16,增加heap sizes信息

Level =32,增加heap信息

转储控制文件、日志文件、数据文件:

alter session set events 'immediate trace name controlf level 10';alter session set events 'immediate trace name redohdr level 3';ALTER SYSTEM DUMP LOGFILE '/opt/oracle9/oradata/testora9/redo01.log';alter system dump datafile 3 block max 2 block min 4;