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doc: Document some nuances of logical replication of TRUNCATE

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Peter Eisentraut 2018-06-27 07:40:18 +02:00
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doc/src/sgml/logical-replication.sgml
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@ -371,6 +371,22 @@
</para>
</listitem>
<listitem>
<para>
Replication of <command>TRUNCATE</command> commands is supported, but
some care must be taken when truncating groups of tables connected by
foreign keys. When replicating a truncate action, the subscriber will
truncate the same group of tables that was truncated on the publisher,
either explictly specified or implicitly collected via
<literal>CASCADE</literal>, minus tables that are not part of the
subscription. This will work correctly if all affected tables are part
of the same subscription. But if some tables to be truncated on the
subscriber have foreign-key links to tables that are not part of the same
(or any) subscription, then the application of the truncate action on the
subscriber will fail.
</para>
</listitem>
<listitem>
<para>
Large objects (see <xref linkend="largeobjects"/>) are not replicated.