Re: Slow delete times??

First of, thanks, Tom.

Although I've been very careful on this kind of things, looks like I
missed one index on a referencing column. Still, I don't allow an entire
delete of a table if it has referencing columns with values, so at the
moment of the deletion, it has no rows at all.

I checked datatype mismatches, and there are none. All my FKs are
integers, like the referenced column of the referenced table.

I was thinking on dropping the indexes before doing the deletes, but
Joshua suggested using TRUNCATE instead.

Thanks.
Octavio.

Tom Lane said:
> "Octavio Alvarez" <alvarezp@alvarezp.ods.org> writes:
>> Please tell me if this timing makes sense to you for a Celeron 433 w/
RAM=256MB dedicated testing server. I expected some slowness, but not
this
>> high.
>
> I'll bet you have foreign keys referencing this table, and the
> referencing columns do not have indexes.  PG will let you do that ...
but it makes updates and deletes horribly slow.  You generally want to
add those indexes.
>
> If they *are* indexed, check for datatype mismatches.  That's
> another thing that kills performance ...
>
>             regards, tom lane
>


--
Octavio Alvarez Piza.
E-mail: alvarezp@alvarezp.ods.org



--
Octavio Alvarez Piza.
E-mail: alvarezp@alvarezp.ods.org