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Extend near-wraparound hints to include replication slots

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Author: Feike Steenbergen
Reviewed-by: Michael Paquier
This commit is contained in:
Simon Riggs
2017-12-29 14:01:25 +00:00
parent 0aa1d489ea
commit 2958a672b1
4 changed files with 19 additions and 16 deletions
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8
doc/src/sgml/logicaldecoding.sgml
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@ -248,16 +248,18 @@ $ pg_recvlogical -d postgres --slot test --drop-slot
may consume changes from a slot at any given time.
</para>
<note>
<caution>
<para>
Replication slots persist across crashes and know nothing about the state
of their consumer(s). They will prevent removal of required resources
even when there is no connection using them. This consumes storage
because neither required WAL nor required rows from the system catalogs
can be removed by <command>VACUUM</command> as long as they are required by a replication
slot. So if a slot is no longer required it should be dropped.
slot. In extreme cases this could cause the database to shut down to prevent
transaction ID wraparound (see <xref linkend="vacuum-for-wraparound"/>).
So if a slot is no longer required it should be dropped.
</para>
</note>
</caution>
</sect2>
<sect2>