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Add support for --jobs in reindexdb

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When doing a schema-level or a database-level operation, a list of
relations to build is created which gets processed in parallel using
multiple connections, based on the recent refactoring for parallel slots
in src/bin/scripts/.  System catalogs are processed first in a
serialized fashion to prevent deadlocks, followed by the rest done in
parallel.

This new option is not compatible with --system as reindexing system
catalogs in parallel can lead to deadlocks, and with --index as there is
no conflict handling for indexes rebuilt in parallel depending in the
same relation.

Author: Julien Rouhaud
Reviewed-by: Sergei Kornilov, Michael Paquier
Discussion: https://postgr.es/m/CAOBaU_YrnH_Jqo46NhaJ7uRBiWWEcS40VNRQxgFbqYo9kApUsg@mail.gmail.com
This commit is contained in:
Michael Paquier
2019-07-27 22:21:18 +09:00
parent 4552c0f566
commit 5ab892c391
4 changed files with 432 additions and 53 deletions
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23
doc/src/sgml/ref/reindexdb.sgml
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@ -166,6 +166,29 @@ PostgreSQL documentation
</listitem>
</varlistentry>
<varlistentry>
<term><option>-j <replaceable class="parameter">njobs</replaceable></option></term>
<term><option>--jobs=<replaceable class="parameter">njobs</replaceable></option></term>
<listitem>
<para>
Execute the reindex commands in parallel by running
<replaceable class="parameter">njobs</replaceable>
commands simultaneously. This option reduces the time of the
processing but it also increases the load on the database server.
</para>
<para>
<application>reindexdb</application> will open
<replaceable class="parameter">njobs</replaceable> connections to the
database, so make sure your <xref linkend="guc-max-connections"/>
setting is high enough to accommodate all connections.
</para>
<para>
Note that this option is incompatible with the <option>--index</option>
and <option>--system</option> options.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-q</option></term>
<term><option>--quiet</option></term>