| From: | Josh Berkus <josh(at)agliodbs(dot)com> |
|---|---|
| To: | "Adam Siegel" <adam(at)sycamorehq(dot)com>, <pgsql-general(at)postgresql(dot)org>, <pgsql-performance(at)postgresql(dot)org> |
| Subject: | Re: [pgsql-performance] Deletes from tables with foreign keys taking too long |
| Date: | 2002-10-01 21:44:05 |
| Message-ID: | 200210011444.05157.josh@agliodbs.com |
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| Lists: | pgsql-general pgsql-performance |
Adam,
> I have a table that has about 200 rows in it. I have 2 other tables that
> have about 300,000 rows each that reference the first table through a
> foriegn key. I run a process that rebuilds these tables. First I delete
> the rows in the large tables (takes about 30 seconds), then I delete the
> the rows in the first table (takes about 5 minutes !!!). Each of these are
> done in separate transactions.
Not that this answers your performance questions, but you will be able to do
this faster if you use TRUNCATE instead of DELETE.
--
Josh Berkus
josh(at)agliodbs(dot)com
Aglio Database Solutions
San Francisco
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