soni de wrote:
I have flushed the database, so currently records in the "lan" table are:
665280
but records can be increased more than 1GB and in that case it takes more
than 1 hour
Below is explain analyze output taken from the table having 665280 records
pdb=# explain analyze SELECT sdate, stime, rbts from lan WHERE (
( bname = 'pluto' ) AND ( cno = 17 ) AND ( pno = 1 ) AND ( ( sdate
>= '2004-07-21' ) AND ( sdate <= '2004-07-21' ) ) ) ORDER BY sdate, stime
;
NOTICE: QUERY PLAN:
Sort (cost=17.13..17.13 rows=1 width=16) (actual time=619140.18..619140.29rows
=288 loops=1)
-> Index Scan using lan_pkey on lan (cost=0.00..17.12 rows=1 width=16)
(actual time=7564.44..619121.61 rows=288 loops=1)
Total runtime: 619140.76 msec
OK - there is clearly something wrong here when you take 10 minutes to
fetch 288 rows from an index.
1. VACUUM FULL VERBOSE lan;
2. test again, and if that doesn't work...
3. REINDEX TABLE lan;
4. test again
I'm guessing you have a *lot* of dead rows in there.
--
Richard Huxton
Archonet Ltd
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