| From: | Andres Freund <andres(at)2ndquadrant(dot)com> |
|---|---|
| To: | Clemens Eisserer <linuxhippy(at)gmail(dot)com> |
| Cc: | pgsql-general(at)postgresql(dot)org |
| Subject: | Re: Will modifications to unlogged tables also be flused to disk? |
| Date: | 2014-02-15 11:47:57 |
| Message-ID: | 20140215114757.GE20973@alap3.anarazel.de |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-general |
Hi,
On 2014-02-15 12:22:56 +0100, Clemens Eisserer wrote:
> > They will lost after a crash, but after a regular shutdown / restart all
> > data in the table.
>
> Yes, the semantics are clearly stated in the documentation.
> What I wonder is whether postgresql will issue flush/fsync operations
> when unlogged tables are modified?
No fsyncs will be issued in the common paths, and they won't be written
to disk by !shutdown checkpoints. But they *will* be written to disk if
there's not enough space in shared_buffers for all the data.
Greetings,
Andres Freund
--
Andres Freund http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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