Home Database Mysql Tutorial ORACLE 中几个难以理解的概念说明

ORACLE 中几个难以理解的概念说明

Jun 07, 2016 pm 04:51 PM
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latch 闩锁,表示oracle数据库运行进程之间在处理一些数据的时候发生的锁定机制。lock 锁,表示oracle数据库中具体对象之间发生并发的时候,

latch 闩锁,,表示Oracle数据库运行进程之间在处理一些数据的时候发生的锁定机制。

lock 锁,表示oracle数据库中具体对象之间发生并发的时候,差生的锁定机制,一般包括表锁定,记录锁定等等

逻辑I/O 表示在数据从缓存中读取的过程中发生的读取和写入操作。只计算在内存中数据处理的时候。

物理I/O 表示数据从磁盘或磁带等设备中读取,写入的操作。例如重做日志文件的读写,数据文件的读写,脏数据从高速缓存写入到数据文件中等等。

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PrimeFactor−Innumbertheory,theprimefactorsofapositiveintegeraretheprimenumbersthatdividethatintegerexactly.Theprocessoffindingthesenumbersiscalledintegerfactorization,orprimefactorization.Example−Primefactorsof288are:288=2x2x2x2x2

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