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doc: Add to hot standby documentation 

Document the order of changing certain settings when using hot-standby
servers.  This is just a logical consequence of what was already
documented, but it gives the users some more practical advice.

Author: Yorick Peterse <yorickpeterse@gmail.com>
Reviewed-by: Aleksander Alekseev <a.alekseev@postgrespro.ru>
Reviewed-by: Robert Haas <robertmhaas@gmail.com>
This commit is contained in:
Peter Eisentraut 2017-11-01 10:50:24 -04:00
parent 067a2259fd
commit 387ec70322
1 changed files with 6 additions and 1 deletions
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7
doc/src/sgml/high-availability.sgml
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@ -2147,7 +2147,12 @@ LOG: database system is ready to accept read only connections
The setting of some parameters on the standby will need reconfiguration
if they have been changed on the primary. For these parameters,
the value on the standby must
be equal to or greater than the value on the primary. If these parameters
be equal to or greater than the value on the primary.
Therefore, if you want to increase these values, you should do so on all
standby servers first, before applying the changes to the primary server.
Conversely, if you want to decrease these values, you should do so on the
primary server first, before applying the changes to all standby servers.
If these parameters
are not set high enough then the standby will refuse to start.
Higher values can then be supplied and the server
restarted to begin recovery again. These parameters are: