Re: BUG #14597: Delay in query execution

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: aravinth(dot)s(at)vortexindia(dot)co(dot)in
Cc: pgsql-bugs(at)postgresql(dot)org
Subject: Re: BUG #14597: Delay in query execution
Date: 2017-03-22 15:23:11
Message-ID: 32763.1490196191@sss.pgh.pa.us
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aravinth(dot)s(at)vortexindia(dot)co(dot)in writes:
> The following bug has been logged on the website:
> Bug reference: 14597
> Logged by: Aravinth Sundaram
> Email address: aravinth(dot)s(at)vortexindia(dot)co(dot)in
> PostgreSQL version: Unsupported/Unknown
> Operating system: Windows Server 2008
> Description:

> A simple delete query performed on a table with 3000 rows took almost 2 hrs
> and 40 mins. The table was vacuumed before executing the query. SQL Server
> was running in the same machine. What could be the reason for the delay?

This is (a) probably not a bug, and (b) entirely undiagnosable from
the amount of information you've given.

For help with asking answerable questions, see

https://wiki.postgresql.org/wiki/Slow_Query_Questions

(But, FWIW, a common reason for slow deletes is a foreign key
referencing this table, where the referencing column is unindexed.
Or maybe the delete was just blocked on somebody's exclusive lock?)

regards, tom lane

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