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postgres_fdw: Allow fetch_size to be set per-table or per-server.

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The default fetch size of 100 rows might not be right in every
environment, so allow users to configure it.

Corey Huinker, reviewed by Kyotaro Horiguchi, Andres Freund, and me.
This commit is contained in:
Robert Haas
2016-02-03 09:01:59 -05:00
parent e6ecc93a17
commit dc203dc3ac
6 changed files with 180 additions and 17 deletions
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27
doc/src/sgml/postgres-fdw.sgml
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@ -290,18 +290,31 @@
be considered shippable to the remote server.
This option can only be specified for foreign servers, not per-table.
</para>
<para>
When using the <literal>extensions</literal> option, <emphasis>it is the
user's responsibility</> that the listed extensions exist and behave
identically on both the local and remote servers. Otherwise, remote
queries may fail or behave unexpectedly.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>fetch_size</literal></term>
<listitem>
<para>
This option specifies the number of rows <filename>postgres_fdw</>
should get in each fetch operation. It can be specified for a foreign
table or a foreign server. The option specified on a table overrides
an option specified for the server.
The default is <literal>100</>.
</para>
</listitem>
</varlistentry>
</variablelist>
<para>
When using the <literal>extensions</literal> option, <emphasis>it is the
user's responsibility</> that the listed extensions exist and behave
identically on both the local and remote servers. Otherwise, remote
queries may fail or behave unexpectedly.
</para>
</sect3>
<sect3>