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doc: move hash info to new section and split out growth item

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Reported-by: Amit Kapila
This commit is contained in:
Bruce Momjian 2017-04-25 09:44:50 -04:00
parent cef5dbbf2b
commit 45e3d8ae2b
1 changed files with 75 additions and 55 deletions
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130
doc/src/sgml/release-10.sgml
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@ -49,14 +49,16 @@
<listitem>
<!--
Created from "Improve hash bucket split performance" item
Copied here from this commit:
Author: Robert Haas <rhaas@postgresql.org>
2017-04-03 [ea69a0dea] Expand hash indexes more gradually.
-->
<para>
<application>pg_upgrade</>-ed hash indexes from previous major Postgres versions must be rebuilt.
</para>
<para>
Major hash index performance improvements necessitated this requirement.
Major hash storage improvements necessitated this requirement.
</para>
</listitem>
@ -448,55 +450,6 @@ processes for non-parallel purposes.
<itemizedlist>
<listitem>
<!--
Author: Robert Haas <rhaas@postgresql.org>
2017-03-14 [c11453ce0] hash: Add write-ahead logging support.
-->
<para>
Add write-ahead logging support to hash indexes (Amit Kapila)
</para>
<para>
This makes hash indexes crash-safe and replicated, and removes the
warning message about their use.
</para>
</listitem>
<listitem>
<!--
Author: Robert Haas <rhaas@postgresql.org>
2016-11-30 [6d46f4783] Improve hash index bucket split behavior.
Author: Robert Haas <rhaas@postgresql.org>
2017-02-07 [293e24e50] Cache hash index's metapage in rel->rd_amcache.
Author: Robert Haas <rhaas@postgresql.org>
2017-02-27 [b0f18cb77] hash: Refactor bucket squeeze code.
Author: Robert Haas <rhaas@postgresql.org>
2017-02-27 [30df93f69] hash: Refactor overflow page allocation.
Author: Robert Haas <rhaas@postgresql.org>
2017-04-03 [ea69a0dea] Expand hash indexes more gradually.
-->
<para>
Improve hash bucket split performance by reducing locking requirements
(Amit Kapila, Mithun Cy)
</para>
<para>
Also cache hash index meta-information for faster lookups. Additional
hash performance improvements have also been made.
</para>
</listitem>
<listitem>
<!--
Author: Robert Haas <rhaas@postgresql.org>
2017-03-15 [6977b8b7f] Port single-page btree vacuum logic to hash indexes.
-->
<para>
Allow single-page hash pruning (Ashutosh Sharma)
</para>
</listitem>
<listitem>
<!--
Author: Andrew Dunstan <andrew@dunslane.net>
@ -568,12 +521,79 @@ This allows future <acronym>BRIN</> index summarization to be more compact. CLA
</itemizedlist>
</sect4>
<sect5>
<title><link linkend="indexes-types">Hash Indexes</link></title>
<sect4>
<title>Locking</title>
<itemizedlist>
<itemizedlist>
<listitem>
<!--
Author: Robert Haas <rhaas@postgresql.org>
2017-03-14 [c11453ce0] hash: Add write-ahead logging support.
-->
<para>
Add write-ahead logging support to hash indexes (Amit Kapila)
</para>
<para>
This makes hash indexes crash-safe and replicated, and removes the
warning message about their use.
</para>
</listitem>
<listitem>
<!--
Author: Robert Haas <rhaas@postgresql.org>
2016-11-30 [6d46f4783] Improve hash index bucket split behavior.
Author: Robert Haas <rhaas@postgresql.org>
2017-02-07 [293e24e50] Cache hash index's metapage in rel->rd_amcache.
Author: Robert Haas <rhaas@postgresql.org>
-->
<para>
Improve hash bucket split performance by reducing locking requirements
(Amit Kapila, Mithun Cy)
</para>
<para>
Also cache hash index meta-information for faster lookups.
</para>
</listitem>
<listitem>
<!--
Author: Robert Haas <rhaas@postgresql.org>
2017-02-27 [b0f18cb77] hash: Refactor bucket squeeze code.
Author: Robert Haas <rhaas@postgresql.org>
2017-02-27 [30df93f69] hash: Refactor overflow page allocation.
Author: Robert Haas <rhaas@postgresql.org>
2017-04-03 [ea69a0dea] Expand hash indexes more gradually.
-->
<para>
Improve efficiency of hash index growth (Amit Kapila, Mithun Cy)
</para>
</listitem>
<listitem>
<!--
Author: Robert Haas <rhaas@postgresql.org>
2017-03-15 [6977b8b7f] Port single-page btree vacuum logic to hash indexes.
-->
<para>
Allow single-page hash pruning (Ashutosh Sharma)
</para>
</listitem>
</itemizedlist>
</sect5>
</sect4>
<sect4>
<title>Locking</title>
<itemizedlist>
<listitem>
<!--