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Postgres FD Implementation
Commit 487990e1 authored by Bruce Momjian's avatar Bruce Momjian
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Add description: 

>
>   O_DIRECT doesn't have the same media write guarantees as fsync, so it
>   is in addition to the fsync method, not in place of it.
>
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doc/TODO
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PostgreSQL TODO List
====================
Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
Last updated: Fri Jun 3 17:42:10 EDT 2005
Last updated: Sat Jun 4 12:53:41 EDT 2005
The most recent version of this document can be viewed at
http://www.postgresql.org/docs/faqs.TODO.html.
......@@ -722,6 +722,10 @@ Cache
* Consider use of open/fcntl(O_DIRECT) to minimize OS caching,
especially for WAL writes
O_DIRECT doesn't have the same media write guarantees as fsync, so it
is in addition to the fsync method, not in place of it.
* -Cache last known per-tuple offsets to speed long tuple access
* Speed up COUNT(*)
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doc/src/FAQ/TODO.html
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<body bgcolor="#FFFFFF" text="#000000" link="#FF0000" vlink="#A00000" alink="#0000FF">
<h1><a name="section_1">PostgreSQL TODO List</a></h1>
<p>Current maintainer: Bruce Momjian (<a href="mailto:pgman@candle.pha.pa.us">pgman@candle.pha.pa.us</a>)<br/>
Last updated: Fri Jun 3 17:42:10 EDT 2005
Last updated: Sat Jun 4 12:53:41 EDT 2005
</p>
<p>The most recent version of this document can be viewed at<br/>
<a href="http://www.postgresql.org/docs/faqs.TODO.html">http://www.postgresql.org/docs/faqs.TODO.html</a>.
......@@ -663,6 +663,9 @@ first.
</p>
</li><li>Consider use of open/fcntl(O_DIRECT) to minimize OS caching,
especially for WAL writes
<p> O_DIRECT doesn't have the same media write guarantees as fsync, so it
is in addition to the fsync method, not in place of it.
</p>
</li><li>-<em>Cache last known per-tuple offsets to speed long tuple access</em>
</li><li>Speed up COUNT(*)
<p> We could use a fixed row count and a +/- count to follow MVCC
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