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SQL Server 2005
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Administering
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prefixing indexes
prefixing indexes
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whitlander
whitlander
Posted Thursday, March 10, 2011 7:53 AM
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In MySQL its possible to use index a prefix of a column to aid performance. is there an equivalent in SQL server?
Post #1076261
GilaMonster
GilaMonster
Posted Thursday, March 10, 2011 8:09 AM
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Could be computed columns, not sure. Could you explain more what the MySQL feature is?
Gail Shaw
Microsoft Certified Master: SQL Server 2008, MVP
SQL In The Wild
: Discussions on DB performance with occasional diversions into recoverability
We walk in the dark places no others will enter
We stand on the bridge and no one may pass
Post #1076270
whitlander
whitlander
Posted Thursday, March 10, 2011 9:40 AM
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when creating an index you can filter the index key to read only N number of characters in field e.g abcdefg and not abcdeftgghhjjjjjjjjjjjjjjjjjjjjjjjjjj. I understand that when the field is used in a query there is less of an overhead.
Post #1076364
GilaMonster
GilaMonster
Posted Thursday, March 10, 2011 10:31 AM
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To do that in SQL you'd need a computed column on LEFT(other column), then you'd need to filter on that computed column. Not for performance, for when you really are matching on part of the column.
Gail Shaw
Microsoft Certified Master: SQL Server 2008, MVP
SQL In The Wild
: Discussions on DB performance with occasional diversions into recoverability
We walk in the dark places no others will enter
We stand on the bridge and no one may pass
Post #1076420
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