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noyellatmonkeys
Starting Member
15 Posts |
 Posted - 2010-02-04 : 19:16:04
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| Hey All,I have a question... so im just learning how to use indexes to speed up some complex queries but I have a question...so on a table that i want to create a few indexes on (lets say 3 or 4) is it better to create an individual index for each one... or one index with multiple columns?Thanks,~ Mauriciop.s. this is a memeber signup table that has new signups added daily |
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tkizer
Almighty SQL Goddess
38200 Posts |
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vmenon
Starting Member
17 Posts |
Posted - 2010-02-05 : 01:08:40
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| Basic Rule --> every table should at least have a clustered index.Important:Columns that are frequently accessed by the WHERE, ORDER BY, GROUP BY, TOP, and DISTINCT clauses are ideal candidates for participating in an indexAlso remember that over indexing your OLTP tables increases the time taken to perform insert, updates and deletes.Only add indexes on columns if you are sure they are used by queries that run against the table. Un-used indexes slow data modifications, causes un-necessay IO while reading pages, and also consumes space which I would term as unwanted. |
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Pretty New To Indexes...