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Update HOT description to make index column changes clearer.

This commit is contained in:
Bruce Momjian 2007-12-07 17:42:49 +00:00
parent 52767ea76f
commit 6b8d26bb07
1 changed files with 6 additions and 6 deletions
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12
doc/src/sgml/release.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/release.sgml,v 1.560 2007/12/07 16:53:31 momjian Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/release.sgml,v 1.561 2007/12/07 17:42:49 momjian Exp $ -->
<!--
Typical markup:
@ -703,13 +703,13 @@ current_date &lt; 2017-11-17
</para>
<para>
<command>UPDATE</>s and <command>DELETE</>s leave dead tuples behind,
as do failed <command>INSERT</>s. Previously only
<command>UPDATE</>s and <command>DELETE</>s leave dead tuples
behind, as do failed <command>INSERT</>s. Previously only
<command>VACUUM</> could reclaim space taken by dead tuples. With
<acronym>HOT</> dead tuple space can be reclaimed at the time of
<command>UPDATE</> or <command>INSERT</>. This allows for more
consistent performance. Also, <acronym>HOT</> avoids making duplicate
index entries when an <command>UPDATE</> changes no indexed columns.
<command>UPDATE</> or <command>INSERT</> if no changes are made to
indexed columns. This allows for more consistent performance.
Also, <acronym>HOT</> avoids adding duplicate index entries.
</para>
</listitem>