diff options
| author | Peter Eisentraut <peter@eisentraut.org> | 2025-03-31 16:54:50 +0200 |
|---|---|---|
| committer | Peter Eisentraut <peter@eisentraut.org> | 2025-03-31 16:54:50 +0200 |
| commit | 0fcf02ad456862d8523a1918e2882e7697a52896 (patch) | |
| tree | c1fac3e9930e316a19ae441d9c4e83ccd16fa4ee /doc/src | |
| parent | e2809e3a1015697832ee4d37b75ba1cd0caac0f0 (diff) | |
| download | postgresql-0fcf02ad456862d8523a1918e2882e7697a52896.tar.gz postgresql-0fcf02ad456862d8523a1918e2882e7697a52896.zip | |
doc: Mention clock synchronization recommendation for hot_standby_feedback
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
Diffstat (limited to 'doc/src')
| -rw-r--r-- | doc/src/sgml/config.sgml | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml index 0d02e21a1ab..fea683cb49c 100644 --- a/doc/src/sgml/config.sgml +++ b/doc/src/sgml/config.sgml @@ -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> |