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Thread: Re: drop tempoary table VERY slow

Re: drop tempoary table VERY slow

From
"Sam Liddicott"
Date:
And when I do drop a table CPU usage goes to 99% on one CPU.

Sam

-----Original Message-----
From: Sam Liddicott
Sent: 31 May 2002 10:57
To: 'pgsql-bugs@postgresql.org'
Subject: drop tempoary table VERY slow


I have a DB where this:

select 1 into temporary table x;
runs quickly, but

drop table x;

takes many seconds to run.

I don't know why.

But:

begin;

select 1 into temporary table x;
abort;

is very quick.

Note the slow dropping applies to automatic dropping of temporary tables
when the connection is closed.
I now "abort" all my query sessions for speed.

I cannot reproduce this on "template1" and it has not always been the case
for my DB.

Sam


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Re: drop tempoary table VERY slow

From
Andrew McMillan
Date:
On Fri, 2002-05-31 at 22:28, Sam Liddicott wrote:
> And when I do drop a table CPU usage goes to 99% on one CPU.

When did you last do a vacuum?  If you are adding and dropping temporary
tables a lot, perhaps you should vacuum pg_class and pg_attribute often
as well.

Regards,
                    Andrew.
>
> Sam
>
> -----Original Message-----
> From: Sam Liddicott
> Sent: 31 May 2002 10:57
> To: 'pgsql-bugs@postgresql.org'
> Subject: drop tempoary table VERY slow
>
>
> I have a DB where this:
>
> select 1 into temporary table x;
> runs quickly, but
>
> drop table x;
>
> takes many seconds to run.
>
> I don't know why.
>
> But:
>
> begin;
>
> select 1 into temporary table x;
> abort;
>
> is very quick.
>
> Note the slow dropping applies to automatic dropping of temporary tables
> when the connection is closed.
> I now "abort" all my query sessions for speed.
>
> I cannot reproduce this on "template1" and it has not always been the case
> for my DB.
>

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