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>
>   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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Bruce Momjian 2005-06-04 16:53:48 +00:00
parent 1bc9235224
commit 487990e1f1
2 changed files with 9 additions and 2 deletions
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doc/TODO
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PostgreSQL TODO List PostgreSQL TODO List
==================== ====================
Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us) 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 The most recent version of this document can be viewed at
http://www.postgresql.org/docs/faqs.TODO.html. http://www.postgresql.org/docs/faqs.TODO.html.
@ -722,6 +722,10 @@ Cache
* Consider use of open/fcntl(O_DIRECT) to minimize OS caching, * Consider use of open/fcntl(O_DIRECT) to minimize OS caching,
especially for WAL writes 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 * -Cache last known per-tuple offsets to speed long tuple access
* Speed up COUNT(*) * 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"> <body bgcolor="#FFFFFF" text="#000000" link="#FF0000" vlink="#A00000" alink="#0000FF">
<h1><a name="section_1">PostgreSQL TODO List</a></h1> <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/> <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>
<p>The most recent version of this document can be viewed at<br/> <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>. <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> </p>
</li><li>Consider use of open/fcntl(O_DIRECT) to minimize OS caching, </li><li>Consider use of open/fcntl(O_DIRECT) to minimize OS caching,
especially for WAL writes 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>-<em>Cache last known per-tuple offsets to speed long tuple access</em>
</li><li>Speed up COUNT(*) </li><li>Speed up COUNT(*)
<p> We could use a fixed row count and a +/- count to follow MVCC <p> We could use a fixed row count and a +/- count to follow MVCC