Обсуждение: BUG #16054: Slowest individual queries

The following bug has been logged on the website:

Bug reference:      16054
Logged by:          Gowri Sankar
Email address:      a.gowri82@gmail.com
PostgreSQL version: 10.9
Operating system:   Amazon Linux
Description:

Hi 
We can see from below similar queries are frequently reported as Slowest
individual queries.  During the same time period high Read IOPS .Please let
me know what is the cause for this fetch statements. Let me know as well
regards this more information. 

FETCH 100 FROM c2;
FETCH 100 FROM c6;
FETCH 100 FROM c2;

Regards,
Gowri.
PostgreSQL DBA.

On Mon, Oct 14, 2019 at 02:24:10AM +0000, PG Bug reporting form wrote:
>The following bug has been logged on the website:
>
>Bug reference:      16054
>Logged by:          Gowri Sankar
>Email address:      a.gowri82@gmail.com
>PostgreSQL version: 10.9
>Operating system:   Amazon Linux
>Description:
>
>Hi
>We can see from below similar queries are frequently reported as Slowest
>individual queries.  During the same time period high Read IOPS .Please let
>me know what is the cause for this fetch statements. Let me know as well
>regards this more information.
>
>FETCH 100 FROM c2;
>FETCH 100 FROM c6;
>FETCH 100 FROM c2;
>

This is very clearly not a bug report, but a question about slow query.
And a woefully incomplete one, because we have no idea what the query
does, whether it's the cause or victim of high I/O usage, etc.

Please read https://wiki.postgresql.org/wiki/Slow_Query_Questions and
then post a question to either pgsql-general or pgsql-performance with
more detailed info.

regars

-- 
Tomas Vondra                  http://www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services