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< Last updated:		Sat May  5 10:47:39 EDT 2007
> Last updated:		Sat May  5 11:39:57 EDT 2007
< * Flush cached query plans when the dependent objects change,
<   when the cardinality of parameters changes dramatically, or
> * -Flush cached query plans when the dependent objects change or
<
<   A more complex solution would be to save multiple plans for different
<   cardinality and use the appropriate plan based on the EXECUTE values.
<
< * Track dependencies in function bodies and recompile/invalidate
<
<   This is particularly important for references to temporary tables
<   in PL/PgSQL because PL/PgSQL caches query plans.  The only workaround
<   in PL/PgSQL is to use EXECUTE.  One complexity is that a function
<   might itself drop and recreate dependent tables, causing it to
<   invalidate its own query plan.
<
< * Invalidate prepared queries, like INSERT, when the table definition
> * -Track dependencies in function bodies and recompile/invalidate
> * -Invalidate prepared queries, like INSERT, when the table definition
This commit is contained in:
Bruce Momjian 2007-05-05 15:40:01 +00:00
parent dc9d3947e6
commit 4835df303d
2 changed files with 37 additions and 57 deletions
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22
doc/TODO
View File

@ -1,8 +1,8 @@
z
PostgreSQL TODO List
====================
Current maintainer: Bruce Momjian (bruce@momjian.us)
Last updated: Sat May 5 10:47:39 EDT 2007
Last updated: Sat May 5 11:39:57 EDT 2007
The most recent version of this document can be viewed at
http://www.postgresql.org/docs/faqs.TODO.html.
@ -958,22 +958,10 @@ Triggers
Dependency Checking
===================
* Flush cached query plans when the dependent objects change,
when the cardinality of parameters changes dramatically, or
* -Flush cached query plans when the dependent objects change or
when new ANALYZE statistics are available
A more complex solution would be to save multiple plans for different
cardinality and use the appropriate plan based on the EXECUTE values.
* Track dependencies in function bodies and recompile/invalidate
This is particularly important for references to temporary tables
in PL/PgSQL because PL/PgSQL caches query plans. The only workaround
in PL/PgSQL is to use EXECUTE. One complexity is that a function
might itself drop and recreate dependent tables, causing it to
invalidate its own query plan.
* Invalidate prepared queries, like INSERT, when the table definition
* -Track dependencies in function bodies and recompile/invalidate
* -Invalidate prepared queries, like INSERT, when the table definition
is altered

72
doc/src/FAQ/TODO.html
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@ -2,14 +2,16 @@
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>PostgreSQL TODO List</title>
<title>z</title>
<meta name="generator" content="HTML::TextToHTML v2.25"/>
</head>
<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: Sat May 5 10:47:39 EDT 2007
</p>
<p>z<br/>
PostgreSQL TODO List
</p><hr/>
Current maintainer: Bruce Momjian (<a href="mailto:bruce@momjian.us">bruce@momjian.us</a>)<br/>
Last updated: Sat May 5 11:39:57 EDT 2007
<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>.
</p>
@ -23,7 +25,7 @@ you would like to work on an item, please read the Developer's FAQ<br/>
first. There is also a developer's wiki at<br/>
<a href="http://developer.postgresql.org">http://developer.postgresql.org</a>.
</p>
<h1><a name="section_2">Administration</a></h1>
<h1><a name="section_1">Administration</a></h1>
<ul>
<li>Allow major upgrades without dump/reload, perhaps using pg_upgrade
@ -151,7 +153,7 @@ first. There is also a developer's wiki at<br/>
</p>
</li></ul>
</li></ul>
<h1><a name="section_3">Monitoring</a></h1>
<h1><a name="section_2">Monitoring</a></h1>
<ul>
<li>Allow server log information to be output as INSERT statements
@ -160,7 +162,7 @@ first. There is also a developer's wiki at<br/>
</p>
</li><li>-<em>Add ability to monitor the use of temporary sort files</em>
</li></ul>
<h1><a name="section_4">Data Types</a></h1>
<h1><a name="section_3">Data Types</a></h1>
<ul>
<li>-<em>Make 64-bit version of the MONEY data type</em>
@ -298,7 +300,7 @@ first. There is also a developer's wiki at<br/>
</li></ul>
</li></ul>
</li></ul>
<h1><a name="section_5">Functions</a></h1>
<h1><a name="section_4">Functions</a></h1>
<ul>
<li>Allow INET subnet tests using non-constants to be indexed
@ -354,7 +356,7 @@ first. There is also a developer's wiki at<br/>
e.g. box @&gt; point
</p>
</li></ul>
<h1><a name="section_6">Multi-Language Support</a></h1>
<h1><a name="section_5">Multi-Language Support</a></h1>
<ul>
<li>Add NCHAR (as distinguished from ordinary varchar),
@ -395,7 +397,7 @@ first. There is also a developer's wiki at<br/>
<p> <a href="http://archives.postgresql.org/pgsql-hackers/2007-03/msg00767.php">http://archives.postgresql.org/pgsql-hackers/2007-03/msg00767.php</a>
</p>
</li></ul>
<h1><a name="section_7">Views / Rules</a></h1>
<h1><a name="section_6">Views / Rules</a></h1>
<ul>
<li>Automatically create rules on views so they are updateable, per SQL99
@ -412,7 +414,7 @@ first. There is also a developer's wiki at<br/>
are added after the view is created.
</p>
</li></ul>
<h1><a name="section_8">SQL Commands</a></h1>
<h1><a name="section_7">SQL Commands</a></h1>
<ul>
<li>Add CORRESPONDING BY to UNION/INTERSECT/EXCEPT
@ -701,7 +703,7 @@ first. There is also a developer's wiki at<br/>
</li></ul>
</li></ul>
</li></ul>
<h1><a name="section_9">Clients</a></h1>
<h1><a name="section_8">Clients</a></h1>
<ul>
<li>Have pg_ctl look at PGHOST in case it is a socket directory?
@ -815,7 +817,7 @@ first. There is also a developer's wiki at<br/>
</p>
</li></ul>
</p></ul>
<h1><a name="section_10">Triggers</a></h1>
<h1><a name="section_9">Triggers</a></h1>
<ul>
<li>Add deferred trigger queue file
@ -850,26 +852,16 @@ first. There is also a developer's wiki at<br/>
<p> <a href="http://archives.postgresql.org/pgsql-general/2007-02/msg01466.php">http://archives.postgresql.org/pgsql-general/2007-02/msg01466.php</a>
</p>
</li></ul>
<h1><a name="section_11">Dependency Checking</a></h1>
<h1><a name="section_10">Dependency Checking</a></h1>
<ul>
<li>Flush cached query plans when the dependent objects change,
when the cardinality of parameters changes dramatically, or
<li>-<em>Flush cached query plans when the dependent objects change or</em>
when new ANALYZE statistics are available
<p> A more complex solution would be to save multiple plans for different
cardinality and use the appropriate plan based on the EXECUTE values.
</p>
</li><li>Track dependencies in function bodies and recompile/invalidate
<p> This is particularly important for references to temporary tables
in PL/PgSQL because PL/PgSQL caches query plans. The only workaround
in PL/PgSQL is to use EXECUTE. One complexity is that a function
might itself drop and recreate dependent tables, causing it to
invalidate its own query plan.
</p>
</li><li>Invalidate prepared queries, like INSERT, when the table definition
</li><li>-<em>Track dependencies in function bodies and recompile/invalidate</em>
</li><li>-<em>Invalidate prepared queries, like INSERT, when the table definition</em>
is altered
</li></ul>
<h1><a name="section_12">Indexes</a></h1>
<h1><a name="section_11">Indexes</a></h1>
<ul>
<li>Add UNIQUE capability to non-btree indexes
@ -942,7 +934,7 @@ first. There is also a developer's wiki at<br/>
</p>
</li></ul>
</li></ul>
<h1><a name="section_13">Fsync</a></h1>
<h1><a name="section_12">Fsync</a></h1>
<ul>
<li>Improve commit_delay handling to reduce fsync()
@ -960,7 +952,7 @@ first. There is also a developer's wiki at<br/>
<a href="http://archives.postgresql.org/pgsql-hackers/2007-01/msg00079.php">http://archives.postgresql.org/pgsql-hackers/2007-01/msg00079.php</a>
</p>
</li></ul>
<h1><a name="section_14">Cache Usage</a></h1>
<h1><a name="section_13">Cache Usage</a></h1>
<ul>
<li>Allow free-behind capability for large sequential scans, perhaps using
@ -1025,7 +1017,7 @@ first. There is also a developer's wiki at<br/>
<a href="http://archives.postgresql.org/pgsql-hackers/2007-01/msg00752.php">http://archives.postgresql.org/pgsql-hackers/2007-01/msg00752.php</a>
</p>
</li></ul>
<h1><a name="section_15">Vacuum</a></h1>
<h1><a name="section_14">Vacuum</a></h1>
<ul>
<li>Improve speed with indexes
@ -1095,7 +1087,7 @@ first. There is also a developer's wiki at<br/>
</p>
</li></ul>
</li></ul>
<h1><a name="section_16">Locking</a></h1>
<h1><a name="section_15">Locking</a></h1>
<ul>
<li>Fix priority ordering of read and write light-weight locks (Neil)
@ -1115,7 +1107,7 @@ first. There is also a developer's wiki at<br/>
</li><li>Add idle_in_transaction_timeout GUC so locks are not held for long
periods of time
</li></ul>
<h1><a name="section_17">Startup Time Improvements</a></h1>
<h1><a name="section_16">Startup Time Improvements</a></h1>
<ul>
<li>Experiment with multi-threaded backend for backend creation [<a href="http://momjian.postgresql.org/cgi-bin/pgtodo?thread">thread</a>]
@ -1138,7 +1130,7 @@ first. There is also a developer's wiki at<br/>
existing backends is one of the difficulties with a backend approach.
</p>
</li></ul>
<h1><a name="section_18">Write-Ahead Log</a></h1>
<h1><a name="section_17">Write-Ahead Log</a></h1>
<ul>
<li>Eliminate need to write full pages to WAL before page modification [<a href="http://momjian.postgresql.org/cgi-bin/pgtodo?wal">wal</a>]
@ -1204,7 +1196,7 @@ first. There is also a developer's wiki at<br/>
of indexes on TOAST tables.
</p>
</li></ul>
<h1><a name="section_19">Optimizer / Executor</a></h1>
<h1><a name="section_18">Optimizer / Executor</a></h1>
<ul>
<li>Improve selectivity functions for geometric operators
@ -1229,7 +1221,7 @@ first. There is also a developer's wiki at<br/>
<p> <a href="http://archives.postgresql.org/pgsql-hackers/2007-01/msg00096.php">http://archives.postgresql.org/pgsql-hackers/2007-01/msg00096.php</a>
</p>
</li></ul>
<h1><a name="section_20">Miscellaneous Performance</a></h1>
<h1><a name="section_19">Miscellaneous Performance</a></h1>
<ul>
<li>Do async I/O for faster random read-ahead of data
@ -1274,7 +1266,7 @@ first. There is also a developer's wiki at<br/>
<p> <a href="http://archives.postgresql.org/pgsql-hackers/2007-01/msg00752.php">http://archives.postgresql.org/pgsql-hackers/2007-01/msg00752.php</a>
</p>
</li></ul>
<h1><a name="section_21">Source Code</a></h1>
<h1><a name="section_20">Source Code</a></h1>
<ul>
<li>Add use of 'const' for variables in source tree
@ -1349,7 +1341,7 @@ first. There is also a developer's wiki at<br/>
of result sets using new statement protocol
</li></ul>
</li></ul>
<h1><a name="section_22">Exotic Features</a></h1>
<h1><a name="section_21">Exotic Features</a></h1>
<ul>
<li>Add pre-parsing phase that converts non-ISO syntax to supported
@ -1377,7 +1369,7 @@ first. There is also a developer's wiki at<br/>
<a href="http://archives.postgresql.org/pgsql-hackers/2006-10/msg01527.php">http://archives.postgresql.org/pgsql-hackers/2006-10/msg01527.php</a>
</p>
</li></ul>
<h1><a name="section_23">Features We Do <u>Not</u> Want</a></h1>
<h1><a name="section_22">Features We Do <u>Not</u> Want</a></h1>
<ul>
<li>All backends running as threads in a single process (not wanted)