[20190416]完善shared latch测试脚本2.txt --//昨天测试shared latch,链接:http://blog.itpub.net/267265/viewspace-2641414/,感觉有点开窍了.^_^. http://andreynikolaev.wordpress.com/2010/11/17/shared-latch-behaves-like-enqueue/ For the shared latches Oracle 10g uses kslgetsl(l…

[20190416]查看shared latch gets的变化.txt 1.环境:SYS@book> @ ver1PORT_STRING                    VERSION        BANNER------------------------------ -------------- --------------------------------------------------------------------------------x86_64/Linux 2…

[20190416]exclusive latch测试脚本.txt --//昨天做了shared latch的测试脚本,今天完善exclusive latch测试脚本,上个星期的测试我是手工执行的.--//今天写一个脚本验证看看.相关链接:http://blog.itpub.net/267265/viewspace-2641414/ => [20190415]关于shared latch(共享栓锁).txthttp://blog.itpub.net/267265/viewspace-264149…

[20190419]shared latch spin count 2.txt --//上午测试shared latch XX模式的情况,链接:http://blog.itpub.net/267265/viewspace-2641902/--//继续测试其它情况.--//链接:http://andreynikolaev.wordpress.com/2011/01/14/spin-tales-part-2-shared-latches-in-oracle-9-2-11g/ S mode get …

[20190415]关于shared latch(共享栓锁).txt http://andreynikolaev.wordpress.com/2010/11/17/shared-latch-behaves-like-enqueue/ For the shared latches Oracle 10g uses kslgetsl(laddr, wait, why, where, mode) function. Oracle 11g has kslgetsl_w()function with the…

[20190505]关于latch 一些统计信息.txt --//我在两篇文章,提到一些latch的统计信息.链接如下:http://blog.itpub.net/267265/viewspace-2642329/ =>[20190423]简单测试latch nowilling等待模式.txthttp://blog.itpub.net/267265/viewspace-2641549/ =>[20190416]查看shared latch gets的变化.txt --//我提到过以前我对这些统…

[20190423]简单测试latch nowilling等待模式.txt --//我对这个问题的理解就是如果参数willing=0,表示无法获取该latch,直接退出,再寻找类似的latch.--//我仅仅知道redo copy latch具有这个特性:> select addr,name,level#,latch#,gets,misses,sleeps,immediate_gets,immediate_misses,waiters_woken,waits_holding_latch,spin…

[20190419]shared latch spin count.txt --//昨天测试exclusive latch spin count = 20000(缺省).--//今天测试shared latch spin count的情况,看了一些文章测试等于2 *_spin_count.--//有了昨天的测试经验,今天测试应该相对容易一些,不过shared latch有两种模式: For the shared latches Oracle 10g uses kslgetsl(laddr, wa…

[20190416]process allocation latch.txt --//看链接:http://andreynikolaev.wordpress.com/2010/12/16/hidden-latch-wait-revolution-that-we-missed/--//里面提到:Oracle no longer uses "repeatedly spin and sleep" approach. The process spins and waits only once.…

[20190416]11g下那些latch是Exclusive的.txt --//昨天测试了11g下那些latch是共享的,链接:--//是否反过来剩下的都是Exclusive的.继续测试: 1.环境:SYS@book> @ ver1PORT_STRING                    VERSION        BANNER------------------------------ -------------- -----------------------------------…