PostgreSQL TODO List
====================
Current maintainer: Bruce Momjian (bruce@momjian.us)
-Last updated: Wed Apr 4 22:08:46 EDT 2007
+Last updated: Fri Apr 6 22:48:08 EDT 2007
The most recent version of this document can be viewed at
http://www.postgresql.org/docs/faqs.TODO.html.
* -Merge xmin/xmax/cmin/cmax back into three header fields
* Consider ways of storing rows more compactly on disk
- o Support a smaller header for short variable-length fields?
-
- One idea is to create zero-or-one-byte-header versions
- of varlena data types. In involves setting the high-bit and
- 0-127 length in the single-byte header, or clear the high bit
- and store the 7-bit ASCII value in the rest of the byte.
- The small-header versions have no alignment requirements.
- http://archives.postgresql.org/pgsql-hackers/2006-09/msg01372.php
-
+ o -Support a smaller header for short variable-length fields
o Reduce the row header size?
o Consider reducing on-disk varlena length from four to two
because a heap row cannot be more than 64k in length
<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:bruce@momjian.us">bruce@momjian.us</a>)<br/>
-Last updated: Wed Apr 4 22:08:46 EDT 2007
+Last updated: Fri Apr 6 22:48:08 EDT 2007
</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>-<em>Merge xmin/xmax/cmin/cmax back into three header fields</em>
</li><li>Consider ways of storing rows more compactly on disk
<ul>
- <li>Support a smaller header for short variable-length fields?
-<p> One idea is to create zero-or-one-byte-header versions
- of varlena data types. In involves setting the high-bit and
- 0-127 length in the single-byte header, or clear the high bit
- and store the 7-bit ASCII value in the rest of the byte.
- The small-header versions have no alignment requirements.
- <a href="http://archives.postgresql.org/pgsql-hackers/2006-09/msg01372.php">http://archives.postgresql.org/pgsql-hackers/2006-09/msg01372.php</a>
-</p>
+ <li>-<em>Support a smaller header for short variable-length fields</em>
</li><li>Reduce the row header size?
</li><li>Consider reducing on-disk varlena length from four to two
because a heap row cannot be more than 64k in length