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体验新版 GitCode,发现更多精彩内容 >>
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0e3afb32
编写于
1月 15, 2005
作者:
T
Tom Lane
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电子邮件补丁
差异文件
Minor improvements in descriptions of recent changes.
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67c1fd1e
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doc/src/sgml/release.sgml
doc/src/sgml/release.sgml
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doc/src/sgml/release.sgml
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0e3afb32
<!--
$PostgreSQL: pgsql/doc/src/sgml/release.sgml,v 1.3
19 2005/01/15 05:59:44 momjian
Exp $
$PostgreSQL: pgsql/doc/src/sgml/release.sgml,v 1.3
20 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>
A
llow PL/pgSQL to understand <command>ELSEIF</>
(Neil)
A
ccept <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>
...
...
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