SQL server中删除与截断的总结 完整文章请点击这个链接:http://codaffection.com/sql-server-article/delete-vs-truncate-in-sql-server/

摘自dotnet mob文章:删除Vs截断SQL Server

最大的区别是truncate是不记录日志的操作，而delete是。

简单地说，这意味着在数据库崩溃的情况下，不能通过截断恢复所操作的数据，但可以通过删除恢复。

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DELETE语句可以有一个WHERE子句来删除特定的记录，而TRUNCATE语句不需要任何子句并擦除整个表。 重要的是，DELETE语句记录删除日期，而TRUNCATE语句不记录删除日期。

简而言之，truncate不会记录任何内容(因此更快，但不能撤消)，而delete会记录日志(并且可以是更大事务的一部分，将回滚等)。如果您在开发中有不想在表中使用的数据，通常最好截断，因为您不会冒填满事务日志的风险

这两个操作的另一个区别是，如果表包含一个标识列，则在TRUNCATE下该列的计数器将重置1(或为该列定义的种子值)。DELETE没有这种影响。

Truncate and Delete in SQL are two commands which is used to remove or delete data from table. Though quite basic in nature both Sql commands can create lot of trouble until you are familiar with details before using it. An Incorrect choice of command can result is either very slow process or can even blew up log segment, if too much data needs to be removed and log segment is not enough. That's why it's critical to know when to use truncate and delete command in SQL but before using these you should be aware of the Differences between Truncate and Delete, and based upon them, we should be able to find out when DELETE is better option for removing data or TRUNCATE should be used to purge tables.

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