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Split up wal-logging items:

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< * Allow control over which tables are WAL-logged [walcontrol]
> * Allow WAL logging to be turned off for a table, but the table
>   might be dropped or truncated during crash recovery [walcontrol]
<   commit.  To do this, only a single writer can modify the table, and
<   writes must happen only on new pages.  Readers can continue accessing
<   the table.  This would affect COPY, and perhaps INSERT/UPDATE too.
<   Another option is to avoid transaction logging entirely and truncate
<   or drop the table on crash recovery.  These should be implemented
<   using ALTER TABLE, e.g. ALTER TABLE PERSISTENCE [ DROP | TRUNCATE |
<   STABLE | DEFAULT ].  Tables using non-default logging should not use
<   referential integrity with default-logging tables, and tables using
<   stable logging probably can not have indexes.  One complexity is
<   the handling of indexes on TOAST tables.
>   commit.  This should be implemented using ALTER TABLE, e.g. ALTER
>   TABLE PERSISTENCE [ DROP | TRUNCATE | DEFAULT ].  Tables using
>   non-default logging should not use referential integrity with
>   default-logging tables.  A table without dirty buffers during a
>   crash could perhaps avoid the drop/truncate.
>
> * Allow WAL logging to be turned off for a table, but the table would
>   avoid being truncated/dropped [walcontrol]
>
>   To do this, only a single writer can modify the table, and writes
>   must happen only on new pages so the new pages can be removed during
>   crash recovery.  Readers can continue accessing the table.  Such
>   tables probably cannot have indexes.  One complexity is the handling
>   of indexes on TOAST tables.
This commit is contained in:
Bruce Momjian 2006-02-07 02:08:08 +00:00
parent 8bf47f455f
commit 04a942e31e
2 changed files with 36 additions and 27 deletions
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29
doc/TODO
View File

@ -2,7 +2,7 @@
PostgreSQL TODO List
====================
Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
Last updated: Fri Feb 3 22:23:19 EST 2006
Last updated: Mon Feb 6 21:08:10 EST 2006
The most recent version of this document can be viewed at
http://www.postgresql.org/docs/faqs.TODO.html.
@ -1024,19 +1024,24 @@ Write-Ahead Log
remove the 'fsync' parameter (which results in an an inconsistent
database) in favor of this capability.
* Allow control over which tables are WAL-logged [walcontrol]
* Allow WAL logging to be turned off for a table, but the table
might be dropped or truncated during crash recovery [walcontrol]
Allow tables to bypass WAL writes and just fsync() dirty pages on
commit. To do this, only a single writer can modify the table, and
writes must happen only on new pages. Readers can continue accessing
the table. This would affect COPY, and perhaps INSERT/UPDATE too.
Another option is to avoid transaction logging entirely and truncate
or drop the table on crash recovery. These should be implemented
using ALTER TABLE, e.g. ALTER TABLE PERSISTENCE [ DROP | TRUNCATE |
STABLE | DEFAULT ]. Tables using non-default logging should not use
referential integrity with default-logging tables, and tables using
stable logging probably can not have indexes. One complexity is
the handling of indexes on TOAST tables.
commit. This should be implemented using ALTER TABLE, e.g. ALTER
TABLE PERSISTENCE [ DROP | TRUNCATE | DEFAULT ]. Tables using
non-default logging should not use referential integrity with
default-logging tables. A table without dirty buffers during a
crash could perhaps avoid the drop/truncate.
* Allow WAL logging to be turned off for a table, but the table would
avoid being truncated/dropped [walcontrol]
To do this, only a single writer can modify the table, and writes
must happen only on new pages so the new pages can be removed during
crash recovery. Readers can continue accessing the table. Such
tables probably cannot have indexes. One complexity is the handling
of indexes on TOAST tables.
Optimizer / Executor

34
doc/src/FAQ/TODO.html
View File

@ -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: Fri Feb 3 22:23:19 EST 2006
Last updated: Mon Feb 6 21:08:10 EST 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>.
@ -26,7 +26,7 @@ first.
<ul>
<li>%Remove behavior of postmaster -o
</li><li>-<em>%Allow pooled connections to list all prepared statements</em>
</li><li>-*%Allow pooled connections to list all prepared statements*
<p> This would allow an application inheriting a pooled connection to know
the statements prepared in the current session.
</p>
@ -79,8 +79,8 @@ first.
</li><li>%Allow postgresql.conf file values to be changed via an SQL
API, perhaps using SET GLOBAL
</li><li>Allow the server to be stopped/restarted via an SQL API
</li><li>-<em>Issue a warning if a change-on-restart-only postgresql.conf value
is modified and the server config files are reloaded</em>
</li><li>-<em>Issue a warning if a change-on-restart-only postgresql.conf value</em>
is modified and the server config files are reloaded
</li><li>Mark change-on-restart-only values in postgresql.conf
</li></ul>
</li><li>Tablespaces
@ -928,18 +928,22 @@ first.
remove the 'fsync' parameter (which results in an an inconsistent
database) in favor of this capability.
</p>
</li><li>Allow control over which tables are WAL-logged [<a href="http://momjian.postgresql.org/cgi-bin/pgtodo?walcontrol">walcontrol</a>]
</li><li>Allow WAL logging to be turned off for a table, but the table
might be dropped or truncated during crash recovery [<a href="http://momjian.postgresql.org/cgi-bin/pgtodo?walcontrol">walcontrol</a>]
<p> Allow tables to bypass WAL writes and just fsync() dirty pages on
commit. To do this, only a single writer can modify the table, and
writes must happen only on new pages. Readers can continue accessing
the table. This would affect COPY, and perhaps INSERT/UPDATE too.
Another option is to avoid transaction logging entirely and truncate
or drop the table on crash recovery. These should be implemented
using ALTER TABLE, e.g. ALTER TABLE PERSISTENCE [ DROP | TRUNCATE |
STABLE | DEFAULT ]. Tables using non-default logging should not use
referential integrity with default-logging tables, and tables using
stable logging probably can not have indexes. One complexity is
the handling of indexes on TOAST tables.
commit. This should be implemented using ALTER TABLE, e.g. ALTER
TABLE PERSISTENCE [<a href="http://momjian.postgresql.org/cgi-bin/pgtodo? DROP | TRUNCATE | DEFAULT "> DROP | TRUNCATE | DEFAULT </a>]. Tables using
non-default logging should not use referential integrity with
default-logging tables. A table without dirty buffers during a
crash could perhaps avoid the drop/truncate.
</p>
</li><li>Allow WAL logging to be turned off for a table, but the table would
avoid being truncated/dropped [<a href="http://momjian.postgresql.org/cgi-bin/pgtodo?walcontrol">walcontrol</a>]
<p> To do this, only a single writer can modify the table, and writes
must happen only on new pages so the new pages can be removed during
crash recovery. Readers can continue accessing the table. Such
tables probably cannot have indexes. One complexity is the handling
of indexes on TOAST tables.
</p>
</li></ul>
<h1><a name="section_20">Optimizer / Executor</a></h1>