Re: slow dropping of tables, DropRelFileNodeBuffers, tas

On 31 May 2012 19:09, Sergey Koposov <koposov@ast.cam.ac.uk> wrote:
> On Thu, 31 May 2012, Simon Riggs wrote:
>
>>
>> That struck me as a safe and easy optimisation. This was a problem I'd
>> been trying to optimise for 9.2, so I've written a patch that appears
>> simple and clean enough to be applied directly.
>
>
> Thanks! The patch indeed improved the timings, The dropping of 100 tables in
> a single commit before the patch took ~ 50 seconds, now it takes ~ 5 sec

Thanks for the timing.

>(it
> would be nice to reduce it further though, because the dropping of 10000
> tables still takes ~10 min).

Why do you have 10,000 tables and why is it important to drop them so quickly?

If its that important, why not run the drop in parallel sessions?

-- 
 Simon Riggs                   http://www.2ndQuadrant.com/
 PostgreSQL Development, 24x7 Support, Training & Services