From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
---|---|
To: | Greg Smith <greg(at)2ndquadrant(dot)com> |
Cc: | pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: Re: [COMMITTERS] pgsql: Reduce checkpoints and WAL traffic on low activity database serv |
Date: | 2011-11-03 11:33:18 |
Message-ID: | CA+TgmobrFBe05RcsJonbn-kU1gqxiit-oAu+nLoFgWyt1ceQ2g@mail.gmail.com |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-committers pgsql-hackers |
On Wed, Nov 2, 2011 at 8:21 PM, Greg Smith <greg(at)2ndquadrant(dot)com> wrote:
> In cases where there are little or no writes to the WAL, checkpoints will be
> skipped even if checkpoint_timeout has passed. At least one new WAL segment
> must have been created before an automatic checkpoint occurs. The time
> between checkpoints and when new WAL segments are created are not related in
> any other way. If file-based WAL shipping is being used and you want to
> bound how often files are sent to standby server, to reduce potential data
> loss you should adjust archive_timeout parameter rather than the checkpoint
> ones.
I think this is good, although "where there are little or no writes to
the WAL" seems a bit awkward to me - how about "where little or no WAL
has been written"?
I would probably delete "to reduce potential data loss" from the last
sentence, since I think that sentence has a few too many clauses to be
easily parseable.
Should we also put a similar sentence into the documentation for
checkpoint_timeout?
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
From | Date | Subject | |
---|---|---|---|
Next Message | Heikki Linnakangas | 2011-11-03 11:56:44 | pgsql: Support range data types. |
Previous Message | Simon Riggs | 2011-11-03 08:55:11 | Re: Re: [COMMITTERS] pgsql: Reduce checkpoints and WAL traffic on low activity database serv |
From | Date | Subject | |
---|---|---|---|
Next Message | Heikki Linnakangas | 2011-11-03 11:59:56 | Re: GiST for range types (was Re: Range Types - typo + NULL string constructor) |
Previous Message | Simon Riggs | 2011-11-03 11:15:22 | Re: heap vacuum & cleanup locks |