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Mention that HOT helps with DELETE space reuse.
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doc/src/sgml/release.sgml

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<!-- $PostgreSQL: pgsql/doc/src/sgml/release.sgml,v 1.570 2007/12/16 07:19:32 momjian Exp $ -->
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<!-- $PostgreSQL: pgsql/doc/src/sgml/release.sgml,v 1.571 2007/12/16 13:05:30 momjian Exp $ -->
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<!--
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Typical markup:
@@ -204,7 +204,7 @@ do it for earlier branch release files.
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<listitem>
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<para>
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Heap-Only Tuples (<acronym>HOT</>) accelerate space reuse for
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most <command>UPDATE</>s
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most <command>UPDATE</>s and <command>DELETE</>s
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</para>
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</listitem>
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@@ -736,15 +736,16 @@ current_date &lt; 2017-11-17
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<listitem>
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<para>
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Heap-Only Tuples (<acronym>HOT</>) accelerate space reuse for most
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<command>UPDATE</>s (Pavan Deolasee, with ideas from many others)
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<command>UPDATE</>s and <command>DELETE</>s (Pavan Deolasee, with
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ideas from many others)
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</para>
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<para>
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<command>UPDATE</>s and <command>DELETE</>s leave dead tuples
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behind, as do failed <command>INSERT</>s. Previously only
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<command>VACUUM</> could reclaim space taken by dead tuples. With
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<acronym>HOT</> dead tuple space can be reclaimed at the time of
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<command>UPDATE</> or <command>INSERT</> if no changes are made to
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<command>INSERT</> or <command>UPDATE</> if no changes are made to
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indexed columns. This allows for more consistent performance.
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Also, <acronym>HOT</> avoids adding duplicate index entries.
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</para>

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