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Index slowing down SQL ???
Message
Information générale
Forum:
Visual FoxPro
Catégorie:
Autre
Divers
Thread ID:
00297872
Message ID:
00297931
Vues:
35
>Hello!
>
>I need some expert advice. Recently someone made a statement that I have never heard before and seriously doubt the validity of.
>
>They said that too many indexes on a table may actually SLOW down a SELECT. I do understand how a tag on DELETED() may effect a SELECT but not having too many indexes. Has anyone EVER heard this before and is there any truth to this statement??
>
>And if so how many indexes are considered EXCESSIVE. I have a application with the master table containing maybe 150 fields and 15 indexes. IMHO 15 indexes is not excessive.

Rudy makes sense. To add, as far as sheer number, 15 isn't much...However, I have noticed a slight slowdown with some things like optimized LOCATE or SQL with 30 or more tags - it may take a moment to check through them all, that makes sense.

Try putting 100 tags on your table, including some complex ones - I'll bet you'll see a little performance hit now and then :)
The Anonymous Bureaucrat,
and frankly, quite content not to be
a member of either major US political party.
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