Hi Markus,
first of all thanks for your quick reply!
Markus Schaber wrote:
Kjeld Peters wrote:
Select and update statements are quite slow on a large table with more
than 600,000 rows. The table consists of 11 columns (nothing special).
The column "id" (int8) is primary key and has a btree index on it.
The following select statement takes nearly 500ms:
SELECT * FROM table WHERE id = 600000;
Known issue which is fixed in 8.X servers, postgreSQL sees your 600000
as int4 literal and does not grasp that the int8 index works for it.
SELECT * FROM table WHERE id = 600000::int8;
should do it.
After I appended "::int8" to the query, selecting the table takes only
40-50ms. That's a great performance boost!
Btw, you should update to 7.4.12, there are importand bug fixes and it
is upgradable "in place", without dumping and reloading the database.
I guess I'll test an upgrade to version 8.1.
Thanks again for your and Ragnar's help!
Kjeld
