Add:

>
> * 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.

diff --git a/doc/TODO b/doc/TODO
index 6e197cd354adf0fbc9795707d8a6b6b47932e247..7908a84b548f2b9bfb0b533b751113da0f201e9a 100644 (file)
--- a/doc/TODO
+++ b/doc/TODO
@@ -2,7 +2,7 @@
 PostgreSQL TODO List
 ====================
 Current maintainer:    Bruce Momjian ([email protected])
-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.
@@ -800,6 +800,13 @@ Vacuum
   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

diff --git a/doc/src/FAQ/TODO.html b/doc/src/FAQ/TODO.html
index d96c5d08904d748426523c672d46f81060cd53bd..86a33285da405cec9a738817ee365c83ca2c45b2 100644 (file)
--- a/doc/src/FAQ/TODO.html
+++ b/doc/src/FAQ/TODO.html
@@ -8,7 +8,7 @@
 
 PostgreSQL TODO List
 Current maintainer:     Bruce Momjian ([email protected])
-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.
@@ -735,6 +735,12 @@ first.
   Maintain a map of recently-expired rows
   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