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doc: Mention clock synchronization recommendation for hot_standby_feedback

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hot_standby_feedback mechanics assume that clocks are synchronized,
but it was not clear from documentation.

Author: Jakub Wartak <jakub.wartak@enterprisedb.com>
Reviewed-by: Euler Taveira <euler@eulerto.com>
Reviewed-by: Amit Kapila <amit.kapila16@gmail.com>
Reviewed-by: vignesh C <vignesh21@gmail.com>
Discussion: https://postgr.es/m/CAKZiRmwBcALLrDgCyEhHP1enUxtPMjyNM_d1A2Lng3_6Rf4Qfw%40mail.gmail.com
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Peter Eisentraut 2025-03-31 16:54:50 +02:00
parent e2809e3a10
commit 0fcf02ad45
1 changed files with 7 additions and 0 deletions
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doc/src/sgml/config.sgml
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@ -5068,6 +5068,13 @@ ANY <replaceable class="parameter">num_sync</replaceable> ( <replaceable class="
until it eventually reaches the primary. Standbys make no other use
of feedback they receive other than to pass upstream.
</para>
<para>
Note that if the clock on standby is moved ahead or backward, the
feedback message might not be sent at the required interval. In
extreme cases, this can lead to a prolonged risk of not removing dead
rows on the primary for extended periods, as the feedback mechanism is
based on timestamps.
</para>
</listitem>
</varlistentry>