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  SQL Server Tips by Gama and Naughter

Temporary tables

Temporary tables are very useful for storing intermediate values from time consuming calculations, store the output rows from a SP, serve as a buffer for data waiting to be processed, avoid a cursor with a heavy load, avoid repeating queries with a huge number of rows or complex joins, an alternative to recursive solutions, etc.

Temporary tables are very effective with huge amounts of data. By filtering only the strictly necessary rows and columns and storing the result in a temporary table, for several gigantic tables, this will create mini versions, easier to use. Doing this before a SELECT statement with a JOIN clause that would use those temporary tables and with carefully chosen indexes, the result will be a great performance boost.

One of the downsides is that it creates locks on tempdb.

It is recommended to avoid SELECT INTO with temporary tables because it locks system objects causing performance degradation. Extra care is required with clustered indexes to make sure that the extra overhead will not outweigh the advantages.

There are three kinds of temporary tables: local, global and table datatype.


The above book excerpt is from:

Super SQL Server Systems
Turbocharge Database Performance with C++ External Procedures

ISBN: 0-9761573-2-2
Joseph Gama, P. J. Naughter

 http://www.rampant-books.com/book_2005_2_sql_server_external_procedures.htm  

 

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