Topic: Performance & Tuning >> Use of composite Index
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| Title: Use of composite Index |
| nocturnal |
Posted: Feb 24, 2003 04:13:00 PM |
Total Post: 11
Joined: Jan, 2003
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Hi Gurus,
If I have a composite Index on few columns and use only one column for joining a table then that joined column will use Index or Not.
For example
composite index is on (a,b,c) in a table test and I use just test.a=test2.x Here test2 is another table.
If this index is not in used and another index on column a is created then that will be used by the query or not.
Please advise,
Thanks,
Puneet
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 Vegeta |
| Posted: Feb 24, 2003 10:39:00 PM |  |
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Total Post: 3
Joined: Jan, 2003
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Hi Puneet,
If you are using the lead columns in the composite index then it will be used.
Like in Composite index(a,b,c), If you use a, a or b, or a,b,c the your are fine.
If you use b or c or bc you are not.
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| klleung |
| Posted: Jul 30, 2003 07:19:00 PM | |
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Total Post: 2
Joined: Jan, 2003
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What if you use a, b, c AND D? Will it still use the composite index on (a,b,c)??
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