| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | Srikanth <srikanth(at)inventum(dot)net> |
| Cc: | pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: What is the best way to optimize the query. |
| Date: | 2010-07-27 18:11:27 |
| Message-ID: | AANLkTinh4d6+0t9=0on28O_2eqSx+y=UNZX9iiptjAX6@mail.gmail.com |
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| Lists: | pgsql-performance |
On Sat, Jul 17, 2010 at 4:50 AM, Srikanth <srikanth(at)inventum(dot)net> wrote:
> I am sending u the query along with execution plan. Please help
Looks to me like your biggest problem is right here:
" -> Seq Scan
on subs s (cost=0.00..5599.42 rows=58313 width=69) (actual
time=409.370..153354.835 rows=146954 loops=1)"
" Filter:
(CASE WHEN ((status = 0) AND issubsexpired(subsno)) THEN 15 ELSE
status END <= 15)"
1ms/row is pretty slow, so I'm guessing that the issubsexpired()
function is not too speedy.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise Postgres Company
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