Re: pg_rewind and WAL size...

From: Michael Paquier <michael(dot)paquier(at)gmail(dot)com>
To: marin(at)kset(dot)org
Cc: PostgreSQL mailing lists <pgsql-general(at)postgresql(dot)org>
Subject: Re: pg_rewind and WAL size...
Date: 2016-11-22 12:57:15
Message-ID: CAB7nPqQuwVuGjKbMgyC+Ahe8g16ve8xBPjK8WRUSPniCtpYokA@mail.gmail.com
Views: Raw Message | Whole Thread | Download mbox | Resend email
Thread:
Lists: pgsql-general

On Tue, Nov 22, 2016 at 9:40 PM, <marin(at)kset(dot)org> wrote:
> Am I doing something wrong? Would tweaking some checkpoint parameters help
> reduce the WAL volume?

The answer to this question is likely yes. wal_log_hints enforces a
FPW for the first modification of a page even if that's for some hint
bits. This generates traffic for OLTP types of workloads where many
pages are dirtied and flushed at checkpoint.
--
Michael

In response to

Browse pgsql-general by date

  From Date Subject
Next Message Poul Kristensen 2016-11-22 14:22:28 Re: Postgresql 9.5 and Shell scripts/variables vs. C programming/defining a value to be used
Previous Message marin 2016-11-22 12:40:13 pg_rewind and WAL size...