pg.ddx.io  pgsql-performance@postgresql.org mailing list archive  

help / color / mirror / Atom feed
From: Tom Lane <tgl@sss.pgh.pa.us>
To: Jeff Frost <jeff@pgexperts.com>
Cc: Andres Freund <andres@2ndquadrant.com>
Cc: Soni M <diptatapa@gmail.com>
Cc: Heikki Linnakangas <hlinnakangas@vmware.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Postgres Replaying WAL slowly
Date: Mon, 30 Jun 2014 15:32:30 -0400
Message-ID: <20300.1404156750@sss.pgh.pa.us> (raw)
In-Reply-To: <F3E1168D-8D49-407E-A8B7-B3ED81C93DCB@pgexperts.com>
References: <CAAMgDXm5Y9QPELKvCGBrFvPcuR0ENVA1tEYRcazhDSxs6xnX5w@mail.gmail.com>
	<53AFCEE3.4080009@vmware.com>
	<CAAMgDXnKknBDk+Zb3BXau1cKV7y1A0vd9CJpX=vkSTXVGBrZwA@mail.gmail.com>
	<53B10C4C.8090701@vmware.com>
	<CAAMgDX=c8_6tutCDNiu38Z4wguKMGbhqznVNyMiOC5PZBpn1Fw@mail.gmail.com>
	<53B18CE0.4060501@vmware.com>
	<20140630171416.GK21422@awork2.anarazel.de>
	<CAAMgDXnT8cQbwxcNXfFKONrRVAKoGhR-3FWYSX_5gJcFrEMPMQ@mail.gmail.com>
	<8DA8C140-818D-4184-AAE6-CA37278B983C@pgexperts.com>
	<20140630183908.GT26930@awork2.anarazel.de>
	<0A7B96D4-DB10-49A8-A268-F28960F2E137@pgexperts.com>
	<F3E1168D-8D49-407E-A8B7-B3ED81C93DCB@pgexperts.com>
List-Unsubscribe:  <mailto:majordomo@postgresql.org?body=unsub%20pgsql-performance>

Jeff Frost <jeff@pgexperts.com> writes:
> Sampling pg_locks on the primary shows ~50 locks with ExclusiveLock mode:

>            mode           | count
> --------------------------+-------
>  AccessExclusiveLock      |    11
>  AccessShareLock          |  2089
>  ExclusiveLock            |    46
>  RowExclusiveLock         |    81
>  RowShareLock             |    17
>  ShareLock                |     4
>  ShareUpdateExclusiveLock |     5

That's not too helpful if you don't pay attention to what the lock is on;
it's likely that all the ExclusiveLocks are on transactions' own XIDs,
which isn't relevant to the standby's behavior.  The AccessExclusiveLocks
are probably interesting though --- you should look to see what those
are on.

			regards, tom lane


-- 
Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-performance



view thread (33+ messages)  latest in thread

Message-ID: <20300.1404156750@sss.pgh.pa.us>
Permalink:  ../20300.1404156750@sss.pgh.pa.us/
Also on:    postgresql.org/message-id/20300.1404156750@sss.pgh.pa.us

 · 

reply
Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Reply to all the recipients using the --to and --cc options:
  reply via email

  To: pgsql-performance@postgresql.org
  Cc: tgl@sss.pgh.pa.us, jeff@pgexperts.com, andres@2ndquadrant.com, diptatapa@gmail.com, hlinnakangas@vmware.com
  Subject: Re: Postgres Replaying WAL slowly
  In-Reply-To: <20300.1404156750@sss.pgh.pa.us>

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox