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| author | Bruce Momjian <bruce@momjian.us> | 2005-06-17 02:20:43 +0000 |
|---|---|---|
| committer | Bruce Momjian <bruce@momjian.us> | 2005-06-17 02:20:43 +0000 |
| commit | 1b618e50a6eb422b0cffec33ee78201c2dae9f8d (patch) | |
| tree | bd4ef50f64bafa17e7855b200b01430f3143907d | |
| parent | a6c7e843da693695fabbd7891dabb7892703e45d (diff) | |
| download | postgresql-1b618e50a6eb422b0cffec33ee78201c2dae9f8d.tar.gz postgresql-1b618e50a6eb422b0cffec33ee78201c2dae9f8d.zip | |
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.
| -rw-r--r-- | doc/TODO | 9 | ||||
| -rw-r--r-- | doc/src/FAQ/TODO.html | 8 |
2 files changed, 15 insertions, 2 deletions
@@ -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 diff --git a/doc/src/FAQ/TODO.html b/doc/src/FAQ/TODO.html index d96c5d08904..86a33285da4 100644 --- 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>. @@ -736,6 +736,12 @@ first. <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> <li>Move into the backend code |