| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | Roman <zotov(at)oe-it(dot)ru> |
| Cc: | pgsql-bugs(at)postgresql(dot)org |
| Subject: | Re: BUG #5542: Query optimization problem |
| Date: | 2010-07-09 02:29:23 |
| Message-ID: | AANLkTilrRoFkqoUyPW2A50HyQ2fydOG_zoH3cbCoYdB8@mail.gmail.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-bugs |
On Tue, Jul 6, 2010 at 2:43 AM, Roman <zotov(at)oe-it(dot)ru> wrote:
> I have a query:
>
> SELECT d1.ID, d2.ID
> FROM DocPrimary d1
> JOIN DocPrimary d2 ON d2.BasedOn=d1.ID
> WHERE (d1.ID=234409763) or (d2.ID=234409763)
>
> i think what QO(Query Optimizer) can make it faster (now it seq scan and on
> million records works 7 sec)
>
> SELECT d1.ID, d2.ID
> FROM DocPrimary d1
> JOIN DocPrimary d2 ON d2.BasedOn=d1.ID
> WHERE (d2.BasedOn=234409763) or (d2.ID=234409763)
EXPLAIN ANALYZE output for both queries, please?
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise Postgres Company
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Craig Ringer | 2010-07-09 02:58:25 | Re: [TESTERS] Location of certs -Windows 7 SSL mode? |
| Previous Message | Tom Lane | 2010-07-08 16:00:05 | Re: BUG #5547: not able to connect to postgres through the oracle using Linux ODBC driver for Postgres |