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Mention that HOT helps with DELETE space reuse.

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Bruce Momjian 2007-12-16 13:05:30 +00:00
parent 7b618017fd
commit d6a18f459a
1 changed files with 5 additions and 4 deletions
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doc/src/sgml/release.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/release.sgml,v 1.570 2007/12/16 07:19:32 momjian Exp $ --> <!-- $PostgreSQL: pgsql/doc/src/sgml/release.sgml,v 1.571 2007/12/16 13:05:30 momjian Exp $ -->
<!-- <!--
Typical markup: Typical markup:
@ -204,7 +204,7 @@ do it for earlier branch release files.
<listitem> <listitem>
<para> <para>
Heap-Only Tuples (<acronym>HOT</>) accelerate space reuse for Heap-Only Tuples (<acronym>HOT</>) accelerate space reuse for
most <command>UPDATE</>s most <command>UPDATE</>s and <command>DELETE</>s
</para> </para>
</listitem> </listitem>
@ -736,7 +736,8 @@ current_date &lt; 2017-11-17
<listitem> <listitem>
<para> <para>
Heap-Only Tuples (<acronym>HOT</>) accelerate space reuse for most Heap-Only Tuples (<acronym>HOT</>) accelerate space reuse for most
<command>UPDATE</>s (Pavan Deolasee, with ideas from many others) <command>UPDATE</>s and <command>DELETE</>s (Pavan Deolasee, with
ideas from many others)
</para> </para>
<para> <para>
@ -744,7 +745,7 @@ current_date &lt; 2017-11-17
behind, as do failed <command>INSERT</>s. Previously only behind, as do failed <command>INSERT</>s. Previously only
<command>VACUUM</> could reclaim space taken by dead tuples. With <command>VACUUM</> could reclaim space taken by dead tuples. With
<acronym>HOT</> dead tuple space can be reclaimed at the time of <acronym>HOT</> dead tuple space can be reclaimed at the time of
<command>UPDATE</> or <command>INSERT</> if no changes are made to <command>INSERT</> or <command>UPDATE</> if no changes are made to
indexed columns. This allows for more consistent performance. indexed columns. This allows for more consistent performance.
Also, <acronym>HOT</> avoids adding duplicate index entries. Also, <acronym>HOT</> avoids adding duplicate index entries.
</para> </para>