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From: Egor Rogov <[email protected]>
To: [email protected]
Subject: Re: Suspicious description of track_io_timing
Date: Sun, 12 Jun 2016 13:03:51 -0700 (MST)
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
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Alexander Law wrote
> The following documentation comment has been logged on the website:
> 
> Page:
> https://www.postgresql.org/docs/9.6/static/runtime-config-statistics.html
> Description:
> 
> There is the following sentence in description of the track_io_timing 
> parameter:
> 
> I/O timing information is displayed in &lt;xref 
> linkend=&quot;pg-stat-database-view&quot;&gt;, in the output of &lt;xref 
> linkend=&quot;sql-explain&quot;&gt; when the
> &lt;literal&gt;BUFFERS&lt;/&gt; option is used, and 
> by &lt;xref linkend=&quot;pgstatstatements&quot;&gt;.
> 
> Is it correct? Shouldn&#39;t the TIMING option be mentioned there instead
> of 
> BUFFERS?

Yes, it's correct. Track_io_timing parameter corresponds to the buffer
manager. With BUFFERS option EXPLAIN shows buffers usage; when
track_io_timing is on it also shows I/O read and write time.

Egor Rogov
Postgres Professional: http://www.postgrespro.com
The Russian Postgres Company




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