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对SQLSERVER数据库事务日志的疑问

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Jun 07, 2016 pm 05:45 PM

sqlserveraffairsdatabaselogdoubt

对SQLSERVER数据库事务日志的疑问摸不透SQLSERVER了实验环境：SQLSERVER2005 SP4，Windows7 本来没什么心情写文章，反正没人看，关于我文章中提到的问题，有些可以从文章结尾的MSDN补充那里找到答案，而有些还没有答案根据CSDN博客的这篇文章介绍，大家

对SQLSERVER数据库事务日志的疑问

摸不透SQLSERVER了

实验环境：SQLSERVER2005 SP4，Windows7

本来没什么心情写文章，反正没人看，关于我文章中提到的问题，有些可以从文章结尾的MSDN补充那里找到答案，而有些还没有答案

根据CSDN博客的这篇文章介绍，香港虚拟主机，网站空间，大家可以先看一下，然后再继续往下看，因为下面会引用到CSDN博客里的一些内容

SQL Server事务日志介绍

第一个问题：为什麽我完整备份数据库的时候，为什麽事务日志记录数会增加的，再备份一次又减少，再备份一次又增加？

备份之后变成了100行记录

有时候不是固定会增加50行记录的，有时候当你再次备份的时候又会变回50行记录

而虚拟日志文件的数量会减少了，从原来的45个变成35个

备份之后

我是这样备份的

当我备份事务日志并截断日志之后，剩下10行记录，备份事务日志不会减少事务日志的物理大小，需要收缩事务日志才行

当我每次执行完整备份之后，log space used都会增大

1 DBCC SQLPERF(LOGSPACE) ，虚拟主机

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