摘要: 当我们对数据库优化诊断时,需要收集相应的信息以供参考,从个人的使用经验来说,这种统计数据分为两大类一类是数据库级别的统计信息二类是os级别的统计信息下面就分别介绍在不同的级别下,常用什么工具来收集信息帮助优化诊断首先是oracle数据库级别优化分析工具介绍目录:1.statspack2.ASH3.AWR4.ORACLE EXPLAIN PLAN的总结(查询sql的执行计划) a.autotrace b.explain的使用1.statspacka。安装sql> sqlplus "/ as sysdba"SQL> select file_name from dba 阅读全文
posted @ 2012-07-12 17:44 einyboy 阅读(2859) 评论(0) 推荐(0)
摘要: 今天做awr报告发现gc buffer busy等待时间gc buffer busy This wait event, also known as global cache buffer busy prior toOracle10g, specifies the time the remote instance locally spends accessing the requested data block. This wait event is very similar to the buffer busy waits wait event in asingle-instancedatab 阅读全文
posted @ 2012-07-12 16:38 einyboy 阅读(629) 评论(0) 推荐(0)