On Apr 14, 2008, at 2:49 PM, Petite Abeille wrote:
> Hello,
>
> What heuristics do people use to determine the frequency for analyzing
> their indices?
>
I use the simple heuristic of never running ANALYZE. The ANALYZE
command
is only helpful to the optimizer in certain extreme cases. See, the
discussion at
http://www.sqlite.org/cvstrac/wiki?p=QueryPlans
If you have an application where SQLite chooses a bad query plan by
default,
you can probably get by with running ANALYZE just once on a typical
database,
then copying the resulting sqlite_stat1 table into every new database
you create
with the same schema.
Some database engines benefit from running ANALYZE periodically. SQLite
does not, in general.
D. Richard Hipp
[EMAIL PROTECTED]
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