| From: | Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com> |
|---|---|
| To: | Michael Paquier <michael(dot)paquier(at)gmail(dot)com>, Kuntal Ghosh <kuntalghosh(dot)2007(at)gmail(dot)com> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Peter Geoghegan <pg(at)heroku(dot)com>, Simon Riggs <simon(at)2ndquadrant(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Amit Kapila <amit(dot)kapila(at)enterprisedb(dot)com>, Andres Freund <andres(at)anarazel(dot)de> |
| Subject: | Re: WAL consistency check facility |
| Date: | 2016-11-13 03:06:39 |
| Message-ID: | 24b6df1e-dbe2-bde2-1055-7f4c0c9130d3@2ndquadrant.com |
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| Lists: | pgsql-hackers |
On 11/9/16 11:55 PM, Michael Paquier wrote:
> + <varlistentry id="guc-wal-consistency" xreflabel="wal_consistency">
> + <term><varname>wal_consistency</varname> (<type>string</type>)
> + <indexterm>
> + <primary><varname>wal_consistency</> configuration parameter</primary>
> + </indexterm>
> + </term>
> + <listitem>
> + <para>
> + This parameter is used to check the consistency of WAL records, i.e,
> + whether the WAL records are inserted and applied correctly. When
> + <varname>wal_consistency</varname> is enabled for a WAL record, it
> + stores a full-page image along with the record. When a full-page image
> + arrives during redo, it compares against the current page to check whether
> + both are consistent.
> + </para>
Could we name this something like wal_consistency_checking?
Otherwise it sounds like you use this to select the amount of
consistency in the WAL (similar to, say, wal_level).
--
Peter Eisentraut http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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