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. >
21 years ago · 487990e1f1
parent 1bc9235224
commit 487990e1f1
2 changed files with 9 additions and 2 deletions
--- a/doc/TODO
+++ b/doc/TODO
@ -2,7 +2,7 @@
 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(*)

--- a/doc/src/FAQ/TODO.html
+++ b/doc/src/FAQ/TODO.html
@ -8,7 +8,7 @@
 <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