是一个

select *  from myView

比查询本身更快地创建视图(为了拥有相同的resultSet):

select * from ([query to create same resultSet as myView])

?

我不完全清楚视图是否使用了某种缓存,使其比简单查询更快。


当前回答

一般来说,没有。视图主要用于方便和安全,(它们本身)不会带来任何速度上的好处。

也就是说,SQL Server 2000及以上版本确实有一个称为索引视图的特性,可以极大地提高性能,但有一些注意事项:

不是每个视图都可以被做成索引视图;它们必须遵循一组特定的指导方针,这(在其他限制中)意味着您不能包含常见的查询元素,如COUNT、MIN、MAX或TOP。 索引视图使用数据库中的物理空间,就像表上的索引一样。

本文描述了索引视图的其他优点和局限性:

You Can… The view definition can reference one or more tables in the same database. Once the unique clustered index is created, additional nonclustered indexes can be created against the view. You can update the data in the underlying tables – including inserts, updates, deletes, and even truncates. You Can’t… The view definition can’t reference other views, or tables in other databases. It can’t contain COUNT, MIN, MAX, TOP, outer joins, or a few other keywords or elements. You can’t modify the underlying tables and columns. The view is created with the WITH SCHEMABINDING option. You can’t always predict what the query optimizer will do. If you’re using Enterprise Edition, it will automatically consider the unique clustered index as an option for a query – but if it finds a “better” index, that will be used. You could force the optimizer to use the index through the WITH NOEXPAND hint – but be cautious when using any hint.

其他回答

我希望这两个查询的执行是相同的。视图只不过是一个存储的查询定义,视图没有缓存或存储数据。当您运行第一个查询时,优化器将有效地将其转换为第二个查询。

对于SQL Server来说,视图肯定比嵌套查询要好。在不知道为什么它更好的情况下(直到我读到Mark Brittingham的文章),我已经运行了一些测试,在使用视图和嵌套查询时,我经历了几乎惊人的性能提升。在连续运行查询的每个版本数百次之后,查询的视图版本在一半的时间内完成。我得说这对我来说已经足够了。

没有实际的区别,如果你读BOL,你会发现你的普通旧SQL SELECT * FROM X确实利用了计划缓存等。

In SQL Server at least, Query plans are stored in the plan cache for both views and ordinary SQL queries, based on query/view parameters. For both, they are dropped from the cache when they have been unused for a long enough period and the space is needed for some other newly submitted query. After which, if the same query is issued, it is recompiled and the plan is put back into the cache. So no, there is no difference, given that you are reusing the same SQL query and the same view with the same frequency.

显然,在一般情况下,一个视图,根据它的本质(有人认为它被经常使用,使它成为一个视图)通常比任何任意的SQL语句更有可能被“重用”。

存储执行计划应该会有一些微不足道的好处,但可以忽略不计。