Re: Memory and performance

edipoelder(at)ig(dot)com(dot)br writes:
> I have noted that Postgresql don't make a good memory handle. I have
> made the tables/procedure (in attached file) and run it as "select bench(10,
> 5000)". This will give a 50000 records inserts (5 x 10000). (well, I run it
> on a P200+64MB of RAM, under Linux, and Postgres 7.0.2. In a more powerfull
> machine, you can try other values).

> I get as result, the following times:

> id | objname | benchtime
> ----+---------+-----------
> 1 | group 1 | 00:00:32
> 2 | group 2 | 00:00:47
> 3 | group 3 | 00:01:13
> 4 | group 4 | 00:01:41
> 5 | group 5 | 00:02:08
> (5 rows)

This is an inefficiency in handling of foreign-key triggers. It's fixed
for 7.1 --- in current sources I get

id | objname | benchtime
----+----------+-----------
1 | group 1 | 00:00:03
2 | group 2 | 00:00:03
3 | group 3 | 00:00:03
4 | group 4 | 00:00:03
5 | group 5 | 00:00:03
6 | group 6 | 00:00:03
7 | group 7 | 00:00:03
8 | group 8 | 00:00:03
9 | group 9 | 00:00:03
10 | group 10 | 00:00:03
(10 rows)

regards, tom lane