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doc: update FAQ

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Explain why some values in recovery.conf are surrounded by pairs of single
quotes.
This commit is contained in:
Ian Barwick
2018-08-15 14:42:56 +09:00
parent 6983547325
commit 7bcf87b8ed
1 changed files with 13 additions and 2 deletions
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doc/appendix-faq.sgml
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@@ -239,11 +239,22 @@
Under some circumstances event notifications can be generated for servers Under some circumstances event notifications can be generated for servers
which have not yet been registered; it's also useful to retain a record which have not yet been registered; it's also useful to retain a record
of events which includes servers removed from the replication cluster of events which includes servers removed from the replication cluster
which no longer have an entry in the <literal>repmrg.nodes</literal> table. which no longer have an entry in the <literal>repmgr.nodes</literal> table.
</para> </para>
</sect2> </sect2>
<sect2 id="faq-repmgr-recovery-conf-quoted-values" xreflabel="Quoted values in recovery.conf">
<title>Why are some values in <filename>recovery.conf</filename> surrounded by pairs of single quotes?</title>
<para>
This is to ensure that user-supplied values which are written as parameter values in <filename>recovery.conf</filename>
are escaped correctly and do not cause errors when <filename>recovery.conf</filename> is parsed.
</para>
<para>
The escaping is performed by an internal PostgreSQL routine, which leaves strings consisting
of digits and alphabetical characters only as-is, but wraps everything else in pairs of single quotes,
even if the string does not contain any characters which need escaping.
</para>
</sect2>
</sect1> </sect1>