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Minor improvements in descriptions of recent changes.

This commit is contained in:
Tom Lane 2005-01-15 07:53:04 +00:00
parent 67c1fd1efd
commit 0e3afb3277
1 changed files with 14 additions and 9 deletions
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23
doc/src/sgml/release.sgml
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@ -1,5 +1,5 @@
<!--
$PostgreSQL: pgsql/doc/src/sgml/release.sgml,v 1.319 2005/01/15 05:59:44 momjian Exp $
$PostgreSQL: pgsql/doc/src/sgml/release.sgml,v 1.320 2005/01/15 07:53:04 tgl Exp $
-->
<appendix id="release">
@ -648,14 +648,18 @@ $PostgreSQL: pgsql/doc/src/sgml/release.sgml,v 1.319 2005/01/15 05:59:44 momjian
<listitem>
<para>
Improve optimizer row estimates for non-<command>VACUUM</command>ed
tables (Tom)
Improve optimizer rowcount estimates (Tom)
</para>
<para>
The system now uses the number of blocks in the table to estimate the
number of rows in the table if it has never been
<command>VACUUM</command>ed or <command>ANALYZE</command>d.
Previously a fixed value was used in such cases.
Formerly the planner estimated table sizes using the values seen
by the last <command>VACUUM</command> or <command>ANALYZE</command>,
both as to physical table size (number of pages) and number of rows.
Now, the physical table size is obtained directly from the kernel,
and the number of rows is estimated by multiplying the table size
by the row density (rows per page) seen by the last
<command>VACUUM</command> or <command>ANALYZE</command>. This should
produce more reliable estimates in cases where the table size has
changed significantly since the last housekeeping command.
</para>
</listitem>
@ -1744,10 +1748,11 @@ $PostgreSQL: pgsql/doc/src/sgml/release.sgml,v 1.319 2005/01/15 05:59:44 momjian
<listitem>
<para>
Allow PL/pgSQL to understand <command>ELSEIF</> (Neil)
Accept <command>ELSEIF</> in PL/pgSQL (Neil)
</para>
<para>
Previously PL/pgSQL only understood <command>ELSIF</>.
Previously PL/pgSQL only allowed <command>ELSIF</>, but many people
are accustomed to spelling this keyword <command>ELSEIF</>.
</para>
</listitem>