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Buffering GiST index build algorithm.

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When building a GiST index that doesn't fit in cache, buffers are attached
to some internal nodes in the index. This speeds up the build by avoiding
random I/O that would otherwise be needed to traverse all the way down the
tree to the find right leaf page for tuple.

Alexander Korotkov
This commit is contained in:
Heikki Linnakangas
2011-09-08 17:51:23 +03:00
parent 09b68c70af
commit 5edb24a898
11 changed files with 2297 additions and 186 deletions
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20
doc/src/sgml/ref/create_index.sgml
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@@ -340,6 +340,26 @@ CREATE [ UNIQUE ] INDEX [ CONCURRENTLY ] [ <replaceable class="parameter">name</
</listitem>
</varlistentry>
</variablelist>
<para>
GiST indexes additionaly accepts parameters:
</para>
<variablelist>
<varlistentry>
<term><literal>BUFFERING</></term>
<listitem>
<para>
Determines whether the buffering build technique described in
<xref linkend="gist-buffering-build"> is used to build the index. With
<literal>OFF</> it is disabled, with <literal>ON</> it is enabled, and
with <literal>AUTO</> it is initially disabled, but turned on
on-the-fly once the index size reaches <xref linkend="guc-effective-cache-size">. The default is <literal>AUTO</>.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect2>