Tom Lane wrote:
Gerry Reno <[EMAIL PROTECTED]> writes:
Pavel Stehule wrote:
there is diference in agg position. Send, please, query and explain
analyze output.
[ explain analyze output ]
The rowcount estimates seem pretty far off, even for simple cases that
I'd expect it to get right, eg
-> Seq Scan on res_partner_address a (cost=0.00..88.40
rows=16 width=552) (actual time=0.851..16.131 rows=559 loops=1)
Filter: ((("type")::text = 'default'::text) OR ("type" IS
NULL))
Are the ANALYZE stats up to date for these tables?
What PG version is this, anyway?
regards, tom lane
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TIP 6: explain analyze is your friend
-bash-3.2$ yum list postgresql
Loading "installonlyn" plugin
Installed Packages
postgresql.i386 8.2.4-1.fc7
installed
You were right on the money Tom. I vacuumed the database and now the
query with the boolean executes in only 50% more time than without.
About 15 secs instead of 10 secs. Big improvement. I hadn't seen a
vacuum produce this much of an improvement in performance before.
Thanks,
Gerry
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