PostgreSQL TODO List
====================
Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
-Last updated: Tue Jun 14 19:44:43 EDT 2005
+Last updated: Thu Jun 16 22:20:43 EDT 2005
The most recent version of this document can be viewed at
http://www.postgresql.org/docs/faqs.TODO.html.
This allows vacuum to target specific pages for possible free space
without requiring a sequential scan.
+* Create a bitmap of pages that need vacuuming
+
+ Instead of sequentially scanning the entire table, have the background
+ writer or some other process record pages that have expired rows, then
+ VACUUM can look at just those pages rather than the entire table. In
+ the event of a system crash, the bitmap would probably be invalidated.
+
* Auto-vacuum
o Move into the backend code
o Scan the buffer cache to find free space or use background writer
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<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: Tue Jun 14 19:44:43 EDT 2005
+Last updated: Thu Jun 16 22:20:43 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>.
</li><li>Maintain a map of recently-expired rows
<p> This allows vacuum to target specific pages for possible free space
without requiring a sequential scan.
+</p>
+ </li><li>Create a bitmap of pages that need vacuuming
+<p> Instead of sequentially scanning the entire table, have the background
+ writer or some other process record pages that have expired rows, then
+ VACUUM can look at just those pages rather than the entire table. In
+ the event of a system crash, the bitmap would probably be invalidated.
</p>
</li><li>Auto-vacuum
<ul>