You're reading from SQL Server Query Tuning and Optimization

Product typeBook

Published inAug 2022

PublisherPackt

ISBN-139781803242620

Edition1st Edition

Concepts

Databases

Author (1)

Benjamin Nevarez

FORCE ORDER

The FORCE ORDER hint can give the user full control over the join and aggregation placement in an execution plan. Specifically, the FORCE ORDER hint asks the query optimizer to preserve the join order and aggregation placement as indicated by the query syntax. Also, notice that the ANSI-style join hints explained previously can give you control of the join order, in addition to control over the choice of the join algorithm. Both the FORCE ORDER and ANSI-style join hints are very powerful, and because of that, they need to be used with extreme caution. As explained earlier in this chapter, finding an optimum join order is a critical and challenging part of the query optimization process because the sheer number of possible join orders can be huge, even with queries involving only a few tables. What this boils down to is that, by using the FORCE ORDER hint, you are attempting to optimize the join order yourself. You can use the FORCE ORDER hint to obtain any query, such as...

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SQL Server Query Tuning and Optimization

Published in: Aug 2022Publisher: PacktISBN-13: 9781803242620

Author (1)

Benjamin Nevarez

Benjamin Nevarez is a database professional based in Los Angeles, California who specializes in SQL Server query tuning and optimization. He is the author of several books including “High Performance SQL Server'', “SQL Server 2017 on Linux”, “SQL Server 2014 Query Tuning & Optimization” and “Inside the SQL Server Query Optimizer” and has also co-authored other books such as “SQL Server 2012 Internals”. Benjamin has also been a speaker at many SQL Server conferences around the world
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