July 2012
Intermediate to advanced
478 pages
10h 3m
English
Content preview from Microsoft SQL Server 2012 Performance Tuning CookbookBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Improving performance by using sargable conditions
Sargable stands for Search ARGument Able. Sargable conditions help query optimizers to use the index defined on column(s) effectively. Sargable conditions have a higher chance of meeting index seek than index or table scan.
Getting ready
Writing a sargable condition is also a preventive step. Consider this factor while writing the query or while working on performance tuning projects. There are some operators that make your query sargable or non-sargable. Here is the list:
Sargable operators:
=>>=<<=BETWEENLIKE(only thoseLIKEconditions that have a wildcard character as a suffix, for example,FirstName LIKE 'R%')
Non-sargable operators:
!=!<!><>NOT EXISTSINNOT INLIKE(LIKEconditions that have ...
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