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Add pg_dump --snapshot option

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Allows pg_dump to use a snapshot previously defined by a concurrent
session that has either used pg_export_snapshot() or obtained a
snapshot when creating a logical slot. When this option is used with
parallel pg_dump, the snapshot defined by this option is used and no
new snapshot is taken.

Simon Riggs and Michael Paquier
This commit is contained in:
Simon Riggs
2014-11-17 22:15:07 +00:00
parent 832054044f
commit be1cc8f46f
2 changed files with 55 additions and 17 deletions
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21
doc/src/sgml/ref/pg_dump.sgml
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@ -847,6 +847,27 @@ PostgreSQL documentation
</listitem>
</varlistentry>
<varlistentry>
<term><option>--snapshot=<replaceable class="parameter">snapshotname</replaceable></option></term>
<listitem>
<para>
Use the specifed synchronized snapshot when making a dump of the
database (see
<xref linkend="functions-snapshot-synchronization-table"> for more
details).
</para>
<para>
This option is useful when needing to synchronize the dump with
a logical replication slot (see <xref linkend="logicaldecoding">)
or with a concurrent session.
</para>
<para>
In the case of a parallel dump, the snapshot name defined by this
option is used rather than taking a new snapshot.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>--serializable-deferrable</option></term>
<listitem>