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Change default values for backup and replication parameters

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This changes the default values of the following parameters:

wal_level = replica
max_wal_senders = 10
max_replication_slots = 10

in order to make it possible to make a backup and set up simple
replication on the default settings, without requiring a system restart.

Discussion: https://postgr.es/m/CABUevEy4PR_EAvZEzsbF5s+V0eEvw7shJ2t-AUwbHOjT+yRb3A@mail.gmail.com

Reviewed by Peter Eisentraut. Benchmark help from Tomas Vondra.
This commit is contained in:
Magnus Hagander
2017-01-14 17:14:56 +01:00
parent 05cd12ed5b
commit f6d6d2920d
9 changed files with 21 additions and 20 deletions
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3
doc/src/sgml/backup.sgml
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@ -1420,7 +1420,8 @@ restore_command = 'cp /mnt/server/archivedir/%f %p'
<para>
If more flexibility in copying the backup files is needed, a lower
level process can be used for standalone hot backups as well.
To prepare for low level standalone hot backups, set <varname>wal_level</> to
To prepare for low level standalone hot backups, make sure
<varname>wal_level</> is set to
<literal>replica</> or higher, <varname>archive_mode</> to
<literal>on</>, and set up an <varname>archive_command</> that performs
archiving only when a <emphasis>switch file</> exists. For example:

16
doc/src/sgml/config.sgml
View File

@ -2183,12 +2183,12 @@ include_dir 'conf.d'
</term>
<listitem>
<para>
<varname>wal_level</> determines how much information is written
to the WAL. The default value is <literal>minimal</>, which writes
only the information needed to recover from a crash or immediate
shutdown. <literal>replica</> adds logging required for WAL
archiving as well as information required to run
read-only queries on a standby server. Finally,
<varname>wal_level</> determines how much information is written to
the WAL. The default value is <literal>replica</>, which writes enough
data to support WAL archiving and replication, including running
read-only queries on a standby server. <literal>minimal</> removes all
logging except the information required to recover from a crash or
immediate shutdown. Finally,
<literal>logical</> adds information necessary to support logical
decoding. Each level includes the information logged at all lower
levels. This parameter can only be set at server start.
@ -2926,7 +2926,7 @@ include_dir 'conf.d'
Specifies the maximum number of concurrent connections from
standby servers or streaming base backup clients (i.e., the
maximum number of simultaneously running WAL sender
processes). The default is zero, meaning replication is
processes). The default is 10. The value 0 means replication is
disabled. WAL sender processes count towards the total number
of connections, so the parameter cannot be set higher than
<xref linkend="guc-max-connections">. Abrupt streaming client
@ -2951,7 +2951,7 @@ include_dir 'conf.d'
<para>
Specifies the maximum number of replication slots
(see <xref linkend="streaming-replication-slots">) that the server
can support. The default is zero. This parameter can only be set at
can support. The default is 10. This parameter can only be set at
server start.
<varname>wal_level</varname> must be set
to <literal>replica</literal> or higher to allow replication slots to