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.

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.
1b618e50 · Bruce Momjian · a6c7e843 · 1b618e50 · 1b618e50
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Showing with 15 addition and 2 deletion

doc/TODO doc/TODO +8 -1

doc/src/FAQ/TODO.html doc/src/FAQ/TODO.html +7 -1

未找到文件。
--- a/doc/TODO
+++ b/doc/TODO
@@ -2,7 +2,7 @@
 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.
@@ -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

--- 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:           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>.
@@ -735,6 +735,12 @@ first.
  </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>