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doc: Add note that DROP SUBSCRIPTION drops replication slot 

Add some information about what to do when this fails.
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Peter Eisentraut 2017-05-31 22:35:33 -04:00
parent 420a0392ef
commit de492c17f0
1 changed files with 22 additions and 0 deletions
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doc/src/sgml/ref/drop_subscription.sgml
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@ -73,6 +73,28 @@ DROP SUBSCRIPTION [ IF EXISTS ] <replaceable class="parameter">name</replaceable
</variablelist>
</refsect1>
<refsect1>
<title>Notes</title>
<para>
When dropping a subscription that is associated with a replication slot on
the remote host (the normal state), <command>DROP SUBSCRIPTION</command>
will connect to the remote host and try to drop the replication slot as
part of its operation. This is necessary so that the resources allocated
for the subscription on the remote host are released. If this fails,
either because the remote host is not reachable or because the remote
replication slot cannot be dropped or does not exist or never existed,
the <command>DROP SUBSCRIPTION</command> command will fail. To proceed in
this situation, disassociate the subscription from the replication slot by
executing <literal>ALTER SUBSCRIPTION ... SET (slot_name = NONE)</literal>.
After that, <command>DROP SUBSCRIPTION</command> will no longer attempt any
actions on a remote host. Note that if the remote replication slot still
exists, it should then be dropped manually; otherwise it will continue to
reserve WAL and might eventually cause the disk to fill up. See
also <xref linkend="logical-replication-subscription-slot">.
</para>
</refsect1>
<refsect1>
<title>Examples</title>