Qingqing Zhou wrote:
<[EMAIL PROTECTED]> writes
so, if I do a qry like "EXPLAIN ANALYZE select * from pridecdr where
idsede=8977758488" it tooks a lot of time before i get back any result:
Index Scan using prd_id_sede on pridecdr (cost=0.00..699079.90
rows=181850 width=138) (actual time=51.241..483068.255 rows=150511
loops=1)
Index Cond: (idsede = 8977758488::bigint)
Total runtime: 483355.325 ms
The query plan looks ok. Try to do EXPLAIN ANALYZE twice and see if there is
any difference. This could reduce the IO time to read your index/data since
you got enough RAM.
Also, if you haven't done VACUUM FULL for a long time, do so and compare the
difference.
Could also be libpq buffering all 150000 rows before showing any.
It might be worthwhile using a CURSOR and doing 1 FETCH. If that is
quick, then buffering is probably the issue. BTW - do you really want
all the rows?
Cheers
Mark
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TIP 6: explain analyze is your friend
