1.现象: 客户10.2.0.4 RAC环境,出现大量的library cache lock和cursor: pin S wait on X等待,经分析是由于统计信息收集僵死导致的.数据库在8点到9点期间,数据库两个节点都存在明显的cursor: pin S wait on X和library cache lock的等待: TOP 5 EVENT: Event Waits Time(s) Avg Wait(ms) % Total Call Time Wait Class cursor…
[Info @09:03:33.737] ====================================================================[Info @09:03:33.743] Team Foundation Server Administration Log[Info @09:03:33.748] Version : 11.0.61030.0[Info @09:03:33.748] DateTime : 05/24/2014 17:0…
一.synchronized的再次讨论 使用synchronized关键字来标记一个方法或者代码块,当某个线程调用该对象的synchronized方法或者访问synchronized代码块时, 这个线程便获得了该对象的锁,其他线程暂时无法访问这个方法,只有等待这个方法执行完毕或者代码块执行完毕,这个线程才会释放该对象的锁,其他线程才能执行这个方法或者代码块. synchronized 方法: public synchronized type function (... ...); synchro…
Introduction to Functional Interfaces – A concept recreated in Java 8 Any java developer around the world would have used at least one of the following interfaces: java.lang.Runnable,java.awt.event.ActionListener, java.util.Comparator,java.util.concu…
yum 安装报错 "Another app is currently holding the yum lock; waiting for it to exit... The other application is: PackageKit Memory : 153 M RSS (266 MB VSZ) Started: Thu Jul 12 00:03:05 2012 - 06:17 ago State : Sleeping, pid: 4018Another app is currently…
http://hi.baidu.com/kaisep/item/0e4bf6ee5da001d1ea34c986 源地址 启动weblogic的错误:Could not obtain an exclusive lock to the embedded LDAP data files directory 启动weblogic时报以下错误:<2004-12-22 上午05时25分29秒 CST> <Critical> <WebLogicServer> <BEA-000…
After we introduced locked thread detection to Plumbr couple of months ago, we have started to receive queries similar to “hey, great, now I understand what is causing my performance issues, but what I am supposed to do now?” We are working hard to b…