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Enable parallel query by default.

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Change max_parallel_degree default from 0 to 2.  It is possible that
this is not a good idea, or that we should go with 1 worker rather
than 2, but we won't find out without trying it.  Along the way,
reword the documentation for max_parallel_degree a little bit to
hopefully make it more clear.

Discussion: 20160420174631.3qjjhpwsvvx5bau5@alap3.anarazel.de
This commit is contained in:
Robert Haas
2016-04-26 08:31:38 -04:00
parent b7351ced42
commit 77cd477c4b
4 changed files with 11 additions and 7 deletions
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12
doc/src/sgml/config.sgml
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@ -2005,10 +2005,14 @@ include_dir 'conf.d'
</term>
<listitem>
<para>
Sets the maximum degree of parallelism for an individual parallel
operation. Note that the requested number of workers may not actually
be available at runtime. Parallel workers are taken from the pool
of processes established by <xref linkend="guc-max-worker-processes">.
Sets the maximum number of workers that can be started for an
individual parallel operation. Parallel workers are taken from the
pool of processes established by
<xref linkend="guc-max-worker-processes">. Note that the requested
number of workers may not actually be available at runtime. If this
occurs, the plan will run with fewer workers than expected, which may
be inefficient. The default value is 2. Setting this value to 0
disables parallel query.
</para>
</listitem>
</varlistentry>