提高SQL Server查询性能

Question

I would like to know if there is any tool which will give me the optimized SQL query for which ever query I specify. So that I can improve my DB as well as query performance. I use SQL Server 2008.

Thanks in advance.

Answer 1

The old Rule of DBs still applies, don't try to optimize sql statements, since the DB query parser will do its own optimizations anyway, instead do right away what we all do in the end:

Create indexes to increase performance

Don't get me wrong of course sql queries can be written stupidly and will therefore perform badly, but as long as you created a sensable 'normal' query, the query optimizer will do the rest together with the indexes.

SQL Server will even tell you if a query will clearly benefit from an index when you look at the execution plan. It will even generate the DDL statement to create the index, so all you have to do is copy/paste and run it to have the index your query needs.

Answer 2

您已经可以看到为您提供SQL Server Management Studio的执行计划。

Answer 3

您可以尝试Redgate，他们的大多数产品都有评估版： Redgate网站

Answer 4

SQL Server 2005 and up comes with a Query Optimizer. This can help, but tools can't really do too much optimization suggesting for you because they don't know what you are trying to accomplish.

You might try taking a look instead at some ways in which you can optimize your queries. Here are some links to get you started.

Tips, Tricks, and Advice from the MS SQL Query Optimization Team

SQL Server Rules for Optimizing Queries, best practices

Statistics Used by the Query Optimizer in SQL Server 2008

Answer 5

SQL Server 7.0 / 2000 came with 'index tuning wizard' this functionality has been around for a long time.

I'd reccomend having a look at 'select * from sys.dm_db_missing_index_details' It tells you which indexes are 'missing', it's trivial to look in that table and then create indexes