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denis_the_thief
Aged Yak Warrior
596 Posts |
 Posted - 2010-05-17 : 12:01:07
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| I have a non-unique index on a table: Col1Now I have just added a non-unique index on the same table: Col1, Col2My question is, should I remove the original index on Col1?Would it make any difference if the index on Col1, Col2 was unique? |
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GilaMonster
Master Smack Fu Yak Hacker
4507 Posts |
Posted - 2010-05-17 : 12:10:15
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| Most likely, yes. The index on Col1 is redundant now with the wider index there, regardless of unique/non-unique status of the new one.You'd only leave it there if the new index is significantly wider and using it reduces performance of queries that used the old index significantly.--Gail ShawSQL Server MVP |
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denis_the_thief
Aged Yak Warrior
596 Posts |
Posted - 2010-05-17 : 12:52:50
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| Thank you. |
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Overlapping Indexes Question