| From: | Simon Riggs <simon(at)2ndQuadrant(dot)com> |
|---|---|
| To: | Heikki Linnakangas <hlinnakangas(at)vmware(dot)com> |
| Cc: | Kyotaro HORIGUCHI <horiguchi(dot)kyotaro(at)lab(dot)ntt(dot)co(dot)jp>, masao(dot)fujii(at)gmail(dot)com, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Skip checkpoint on promoting from streaming replication |
| Date: | 2013-01-25 13:26:30 |
| Message-ID: | CA+U5nMJzBCsutE+ZBqsDSgNf_NNq983WdxSFt3=rj6ppbUuEXA@mail.gmail.com |
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| Lists: | pgsql-hackers |
On 25 January 2013 12:15, Heikki Linnakangas <hlinnakangas(at)vmware(dot)com> wrote:
>> 1) an immediate checkpoint can cause a disk/resource usage spike,
>> which is definitely not what you need just when a spike of connections
>> and new SQL hits the system.
>
>
> It doesn't need to be an "immediate" checkpoint, ie. you don't need to rush
> through it with checkpoint_completion_target=0. I think you should initiate
> a regular, slow, checkpoint, right after writing the end-of-recovery record.
> It can take some time for it to finish, which is ok.
OK, will add.
--
Simon Riggs http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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