| From: | Dirk Lutzebaeck <lutzeb(at)aeccom(dot)com> |
|---|---|
| To: | pgsql-general(at)hub(dot)org |
| Subject: | performance and number of selected columns |
| Date: | 2000-05-22 15:25:04 |
| Message-ID: | 14633.20816.626234.631719@ampato.core.aeccom.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-general |
Hi,
say I have three tables a,b,c with lots of columns (say 10 for each
table). Using psql command line, why does
SELECT a.*,b.*,c.* FROM a,b,c
takes much more longer (in my specifc case 3 times) than only
selecting one column like
SELECT a.oid, b.oid, c.oid FROM a,b,c.
This is on 7.0. Can I play with buffer sizes? Indexes exist on most
of the columns. Columns in the second line can be arbitrary.
Dirk
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Barry Lind | 2000-05-22 15:43:57 | How do you rebind/reexecute a query without reparsing it? |
| Previous Message | Palle Girgensohn | 2000-05-22 15:02:37 | Re: [PORTS] Logging (was Re: PostgreSQL 7.0-2 RPMset released.) |