业务系统数据库夯住,数据库内大量的library cache: mutex X及latch: shared pool等待,alert日志信息如下 Tue Sep :: WARNING: inbound connection timed out (ORA-) Tue Sep :: WARNING: inbound connection timed out (ORA-) Tue Sep :: WARNING: inbound connection timed out (ORA-) Tue Sep :…

我们先来看看 library cache: mutex X . 是个什么东西 The library cache mutex is acquired for similar purposes that the library cache latches were acquired in prior versions of Oracle. In 10g, mutexes were introduced for certain operations in the library cache. Sta…

In this Document   Purpose   Troubleshooting Steps   What is a 'library cache: mutex X' wait?   What causes 'library cache: mutex X' wait?   Name of events in 12c and higher   How to diagnose the cause.   How to Examine the Diagnostics.   Potential S…

[20190402]Library Cache mutex.txt 1.环境:SCOTT@book> @ ver1PORT_STRING                    VERSION        BANNER------------------------------ -------------- --------------------------------------------------------------------------------x86_64/Linux 2.…

11g等待事件之library cache: mutex X 作者: dbafree 日期: 2012 年 07 月 01 日发表评论 (0)查看评论   library cache: mutex X替代了之前的library cache latch,主要作用是在hash bucket中定位handle时使用.(比如SQL硬解析时,需要往hash bucket中新增一个cursor时,需要library cache latch).如下图所示:文档上面的解释如下:The library cache…

What is a 'library cache: mutex X' wait? The mutex feature is a mechanism to control access to in memory structures. It is used in a number of areas including the library cache. The library cache is a memory area that holds parsed cursor structures n…

  Oracle的体系结构大体上分为两部分:Instance(实例)和Database(数据库). Instance(实例) :在Oracle Instance中主要包含了SGA以及一些进程(例如:PMON.SMON.DBWn.LGWR.CKPT等).如果一个用户的进程连接到Oracle Server时,其实就是连接到Oracle Instance.在SGA中又包含了5大部件:Share Pool.Database Buffer Cache.Redo Log Buffer.Java Pool.L…

Oracle Shared Pool 原理 由于shared pool中最重要的是library cache,所以本文主要讲解Library cache的结构,library cache latch,library cache lock,library cache pin. What is shared pool? Shared pool是SGA中的一部分,由于它是SGA的一部分,这意味着它可以被所有的进程所访问,Shared Pool当中主要包含了2部分:library cache和dicti…

Oracle内存详解之 Library cache 库缓冲 2017年11月09日 11:38:39 阅读数:410更多 个人分类: 体系结构 Library cache是Shared pool的一部分,它几乎是Oracle内存结构中最复杂的一部分,主要存放shared curosr(SQL)和PLSQL对象(function,procedure,trigger)的信息,以及这些对象所依赖的table,index,view等对象的信息. Library cache需要解决三个问题: 1.快速定位…

Library cache是Shared pool的一部分,它几乎是Oracle内存结构中最复杂的一部分,主要存放shared curosr(SQL)和PLSQL对象(function,procedure,trigger)的信息,以及这些对象所依赖的table,index,view等对象的信息. Library cache需要解决三个问题: 1.快速定位的问题:Library cache中对象众多,Oracle如何管理这些对象,以便服务进程可以迅速找到他们需要的信息.比如某个服务进程需要迅速定位…