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体验新版 GitCode,发现更多精彩内容 >>
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dcdf738a
编写于
4月 13, 2006
作者:
B
Bruce Momjian
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电子邮件补丁
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Fix HTML markup.
上级
2aca4e84
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doc/FAQ
浏览文件 @
dcdf738a
Frequently Asked Questions (FAQ) for PostgreSQL
Last updated: Thu Apr 13 08:
14:25
EDT 2006
Last updated: Thu Apr 13 08:
20:04
EDT 2006
Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
...
...
@@ -569,9 +569,9 @@
Indexes are normally not used for ORDER BY or to perform joins. A
sequential scan followed by an explicit sort is usually faster than an
index scan of a large table.
However, LIMIT combined with ORDER BY often will use an index because
only a small portion of the table is
returned.
index scan of a large table.
However, LIMIT combined with ORDER BY
often will use an index because only a small portion of the table is
returned.
If you believe the optimizer is incorrect in choosing a sequential
scan, use SET enable_seqscan TO 'off' and run query again to see if an
...
...
doc/src/FAQ/FAQ.html
浏览文件 @
dcdf738a
...
...
@@ -10,7 +10,7 @@
alink=
"#0000ff"
>
<H1>
Frequently Asked Questions (FAQ) for PostgreSQL
</H1>
<P>
Last updated: Thu Apr 13 08:
14:25
EDT 2006
</P>
<P>
Last updated: Thu Apr 13 08:
20:04
EDT 2006
</P>
<P>
Current maintainer: Bruce Momjian (
<A
href=
"mailto:pgman@candle.pha.pa.us"
>
pgman@candle.pha.pa.us
</A>
)
...
...
@@ -361,7 +361,7 @@
<LI>
<A
href=
"http://www.intermedia.net/support/sql/sqltut.shtm"
>
http://www.intermedia.net/support/sql/sqltut.shtm
</A>
</LI>
<LI>
<A
href=
"http://sqlcourse.com/"
>
http://sqlcourse.com
</A>
</P>
<A
href=
"http://sqlcourse.com/"
>
http://sqlcourse.com
</A>
</LI>
<LI>
<A
href=
"http://www.w3schools.com/sql/default.asp"
>
http://www.w3schools.com/sql/default.asp
</A>
...
...
@@ -748,7 +748,7 @@ table?</TD><TD>unlimited</TD></TR>
<P>
Indexes are normally not used for
<SMALL>
ORDER BY
</SMALL>
or to
perform joins. A sequential scan followed by an explicit sort is
usually faster than an index scan of a large table.
</P>
usually faster than an index scan of a large table.
However,
<SMALL>
LIMIT
</SMALL>
combined with
<SMALL>
ORDER BY
</SMALL>
often will use an index because only a small portion of the table
is returned.
</P>
...
...
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