diff options
Diffstat (limited to 'doc/src/sgml/config.sgml')
| -rw-r--r-- | doc/src/sgml/config.sgml | 23 |
1 files changed, 14 insertions, 9 deletions
diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml index 259a2d83b4a..3a8fc7d803c 100644 --- a/doc/src/sgml/config.sgml +++ b/doc/src/sgml/config.sgml @@ -696,8 +696,9 @@ include_dir 'conf.d' <para> The default value is three connections. The value must be less - than the value of <varname>max_connections</varname>. This - parameter can only be set at server start. + than <varname>max_connections</varname> minus + <xref linkend="guc-max-wal-senders"/>. + This parameter can only be set at server start. </para> </listitem> </varlistentry> @@ -2982,13 +2983,16 @@ include_dir 'conf.d' maximum number of simultaneously running WAL sender 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 - disconnection might cause an orphaned connection slot until + of connections, so this parameter's value must be less than + <xref linkend="guc-max-connections"/> minus + <xref linkend="guc-superuser-reserved-connections"/>. + Abrupt streaming client disconnection might leave an orphaned + connection slot behind until a timeout is reached, so this parameter should be set slightly higher than the maximum number of expected clients so disconnected clients can immediately reconnect. This parameter can only - be set at server start. <varname>wal_level</varname> must be set to + be set at server start. + Also, <varname>wal_level</varname> must be set to <literal>replica</literal> or higher to allow connections from standby servers. </para> @@ -3007,10 +3011,11 @@ include_dir 'conf.d' (see <xref linkend="streaming-replication-slots"/>) that the server 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 - be used. Setting it to a lower value than the number of currently + Setting it to a lower value than the number of currently existing replication slots will prevent the server from starting. + Also, <varname>wal_level</varname> must be set + to <literal>replica</literal> or higher to allow replication slots to + be used. </para> </listitem> </varlistentry> |