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Provide for parallel restoration from a custom format archive. Each data and

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post-data step is run in a separate worker child (a thread on Windows, a child
process elsewhere) up to the concurrent number specified by the new pg_restore
command-line --multi-thread | -m switch.

Andrew Dunstan, with some editing by Tom Lane.
This commit is contained in:
Andrew Dunstan
2009-02-02 20:07:37 +00:00
parent 3a5b773715
commit 775f1b379e
11 changed files with 1509 additions and 276 deletions
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24
doc/src/sgml/ref/pg_restore.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/ref/pg_restore.sgml,v 1.77 2009/01/05 16:54:36 tgl Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/ref/pg_restore.sgml,v 1.78 2009/02/02 20:07:36 adunstan Exp $ -->
<refentry id="APP-PGRESTORE">
<refmeta>
@ -241,6 +241,28 @@
</listitem>
</varlistentry>
<varlistentry>
<term><option>-m <replaceable class="parameter">number-of-threads</replaceable></option></term>
<term><option>--multi-thread=<replaceable class="parameter">number-of-threads</replaceable></option></term>
<listitem>
<para>
Run the most time-consuming parts of <application>pg_restore</>
&mdash; those which load data, create indexes, or create
constraints &mdash; using multiple concurrent connections to the
database. This option can dramatically reduce the time to restore a
large database to a server running on a multi-processor machine.
</para>
<para>
This option is ignored when emitting a script rather than connecting
directly to a database server. Multiple threads cannot be used
together with <option>--single-transaction</option>. Also, the input
must be a plain file (not, for example, a pipe), and at present only
the custom archive format is supported.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-n <replaceable class="parameter">namespace</replaceable></option></term>
<term><option>--schema=<replaceable class="parameter">schema</replaceable></option></term>