Add:

bmomjian · bmomjian · commit 3e6d1efa4a32 · 2006-09-14T20:30:35.000Z
&gt; * Research storing only active XIDs in subtransaction cache
diff --git a/doc/TODO b/doc/TODO
@@ -2,7 +2,7 @@
 PostgreSQL TODO List
 ====================
 Current maintainer:	Bruce Momjian (bruce@momjian.us)
-Last updated:		Thu Sep 14 14:10:31 EDT 2006
+Last updated:		Thu Sep 14 16:30:31 EDT 2006
 
 The most recent version of this document can be viewed at
 http://www.postgresql.org/docs/faqs.TODO.html.
@@ -1353,6 +1353,7 @@ Miscellaneous Performance
   cmin/cmax pair and is stored in local memory.  Another idea is to
   store both cmin and cmax only in local memory.
 
+* Research storing only active XIDs in subtransaction cache
 * Consider ways of storing rows more compactly on disk
 
 	o Reorder physical storage order to reduce padding?
diff --git 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:bruce@momjian.us">bruce@momjian.us</a>)<br/>
-Last updated:           Thu Sep 14 14:10:31 EDT 2006
+Last updated:           Thu Sep 14 16:30:31 EDT 2006
 </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>.
@@ -1219,6 +1219,7 @@ <h1><a name="section_21">Miscellaneous Performance</a></h1>
   cmin/cmax pair and is stored in local memory.  Another idea is to
   store both cmin and cmax only in local memory.
 </p>
+  </li><li>Research storing only active XIDs in subtransaction cache
   </li><li>Consider ways of storing rows more compactly on disk
   <ul>
     <li>Reorder physical storage order to reduce padding?
