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* Consider whether duplicate keys should be sorted by block/offset

  http://archives.postgresql.org/pgsql-hackers/2008-03/msg00558.php

Create new "Sorting" TODO section.
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Bruce Momjian 2008-06-23 20:20:54 +00:00
parent f6ec7430f9
commit 01930cea03
2 changed files with 50 additions and 38 deletions
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34
doc/TODO
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@ -1,7 +1,7 @@
PostgreSQL TODO List
====================
Current maintainer: Bruce Momjian (bruce@momjian.us)
Last updated: Wed Jun 18 21:15:40 EDT 2008
Last updated: Mon Jun 23 16:20:35 EDT 2008
The most recent version of this document can be viewed at
http://www.postgresql.org/docs/faqs.TODO.html.
@ -1388,6 +1388,25 @@ Indexes
o Allow multi-column hash indexes
o -During index creation, pre-sort the tuples to improve build speed
Sorting
=======
* Consider using hash buckets to do DISTINCT, rather than sorting
This would be beneficial when there are few distinct values. This is
already used by GROUP BY.
* Consider whether duplicate keys should be sorted by block/offset
http://archives.postgresql.org/pgsql-hackers/2008-03/msg00558.php
* -Avoid tuple some tuple copying in sort routines
* Consider being smarter about memory and external files used during
sorts
http://archives.postgresql.org/pgsql-hackers/2007-11/msg01101.php
http://archives.postgresql.org/pgsql-hackers/2007-12/msg00045.php
* Consider detoasting keys before sorting
Fsync
@ -1711,11 +1730,6 @@ Optimizer / Executor
http://archives.postgresql.org/pgsql-hackers/2007-11/msg00771.php
* Consider using hash buckets to do DISTINCT, rather than sorting
This would be beneficial when there are few distinct values. This is
already used by GROUP BY.
* Log statements where the optimizer row estimates were dramatically
different from the number of rows actually found?
* Consider compressed annealing to search for query plans
@ -1865,7 +1879,6 @@ Miscellaneous Performance
http://archives.postgresql.org/pgsql-hackers/2008-01/msg01119.php
* -Avoid tuple some tuple copying in sort routines
* SMP scalability improvements
http://archives.postgresql.org/pgsql-hackers/2007-07/msg00439.php
@ -1876,12 +1889,6 @@ Miscellaneous Performance
http://archives.postgresql.org/pgsql-hackers/2007-09/msg00895.php
* Consider being smarter about memory and external files used during
sorts
http://archives.postgresql.org/pgsql-hackers/2007-11/msg01101.php
http://archives.postgresql.org/pgsql-hackers/2007-12/msg00045.php
* Allow one transaction to see tuples using the snapshot of another
transaction
@ -1917,7 +1924,6 @@ Source Code
http://archives.postgresql.org/pgsql-hackers/2006-09/msg02238.php
http://archives.postgresql.org/pgsql-patches/2006-10/msg00048.php
* Consider detoasting keys before sorting
* Consider GnuTLS if OpenSSL license becomes a problem
http://archives.postgresql.org/pgsql-patches/2006-05/msg00040.php

54
doc/src/FAQ/TODO.html
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@ -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:bruce@momjian.us">bruce@momjian.us</a>)<br/>
Last updated: Wed Jun 18 21:15:40 EDT 2008
Last updated: Mon Jun 23 16:20:35 EDT 2008
</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>.
@ -1203,7 +1203,24 @@ first. There is also a developer's wiki at<br/>
</li><li>Allow multi-column hash indexes
</li><li>-<em>During index creation, pre-sort the tuples to improve build speed</em>
</li></ul>
<h1><a name="section_13">Fsync</a></h1>
<h1><a name="section_13">Sorting</a></h1>
<ul>
<li>Consider using hash buckets to do DISTINCT, rather than sorting
<p> This would be beneficial when there are few distinct values. This is
already used by GROUP BY.
</p>
</li><li>Consider whether duplicate keys should be sorted by block/offset
<p> <a href="http://archives.postgresql.org/pgsql-hackers/2008-03/msg00558.php">http://archives.postgresql.org/pgsql-hackers/2008-03/msg00558.php</a>
</p>
</li><li>-<em>Avoid tuple some tuple copying in sort routines</em>
</li><li>Consider being smarter about memory and external files used during
sorts
<p> <a href="http://archives.postgresql.org/pgsql-hackers/2007-11/msg01101.php">http://archives.postgresql.org/pgsql-hackers/2007-11/msg01101.php</a>
<a href="http://archives.postgresql.org/pgsql-hackers/2007-12/msg00045.php">http://archives.postgresql.org/pgsql-hackers/2007-12/msg00045.php</a>
</p>
</li><li>Consider detoasting keys before sorting
</li></ul>
<h1><a name="section_14">Fsync</a></h1>
<ul>
<li>Determine optimal fdatasync/fsync, O_SYNC/O_DSYNC options
@ -1216,7 +1233,7 @@ first. There is also a developer's wiki at<br/>
<p> <a href="http://archives.postgresql.org/pgsql-hackers/2007-06/msg00541.php">http://archives.postgresql.org/pgsql-hackers/2007-06/msg00541.php</a>
</p>
</li></ul>
<h1><a name="section_14">Cache Usage</a></h1>
<h1><a name="section_15">Cache Usage</a></h1>
<ul>
<li>Speed up COUNT(*)
@ -1277,7 +1294,7 @@ first. There is also a developer's wiki at<br/>
<p> <a href="http://archives.postgresql.org/pgsql-hackers/2007-11/msg00562.php">http://archives.postgresql.org/pgsql-hackers/2007-11/msg00562.php</a>
</p>
</li></ul>
<h1><a name="section_15">Vacuum</a></h1>
<h1><a name="section_16">Vacuum</a></h1>
<ul>
<li>Improve speed with indexes
@ -1345,7 +1362,7 @@ 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_17">Locking</a></h1>
<ul>
<li>Fix priority ordering of read and write light-weight locks (Neil)
@ -1375,7 +1392,7 @@ first. There is also a developer's wiki at<br/>
<p> <a href="http://archives.postgresql.org/pgsql-hackers/2008-01/msg00873.php">http://archives.postgresql.org/pgsql-hackers/2008-01/msg00873.php</a>
</p>
</li></ul>
<h1><a name="section_17">Startup Time Improvements</a></h1>
<h1><a name="section_18">Startup Time Improvements</a></h1>
<ul>
<li>Experiment with multi-threaded backend for backend creation
@ -1386,7 +1403,7 @@ first. There is also a developer's wiki at<br/>
a single session using multiple threads to execute a statement faster.
</p>
</li></ul>
<h1><a name="section_18">Write-Ahead Log</a></h1>
<h1><a name="section_19">Write-Ahead Log</a></h1>
<ul>
<li>Eliminate need to write full pages to WAL before page modification
@ -1469,7 +1486,7 @@ first. There is also a developer's wiki at<br/>
<p> <a href="http://archives.postgresql.org/pgsql-hackers/2007-11/msg00035.php">http://archives.postgresql.org/pgsql-hackers/2007-11/msg00035.php</a>
</p>
</li></ul>
<h1><a name="section_19">Optimizer / Executor</a></h1>
<h1><a name="section_20">Optimizer / Executor</a></h1>
<ul>
<li>Improve selectivity functions for geometric operators
@ -1480,10 +1497,6 @@ first. There is also a developer's wiki at<br/>
actual row counts differ by a specified percentage
</li><li>Improve how ANALYZE computes in-doubt tuples
<p> <a href="http://archives.postgresql.org/pgsql-hackers/2007-11/msg00771.php">http://archives.postgresql.org/pgsql-hackers/2007-11/msg00771.php</a>
</p>
</li><li>Consider using hash buckets to do DISTINCT, rather than sorting
<p> This would be beneficial when there are few distinct values. This is
already used by GROUP BY.
</p>
</li><li>Log statements where the optimizer row estimates were dramatically
different from the number of rows actually found?
@ -1498,7 +1511,7 @@ first. There is also a developer's wiki at<br/>
<p> <a href="http://archives.postgresql.org/pgsql-hackers/2007-05/msg00450.php">http://archives.postgresql.org/pgsql-hackers/2007-05/msg00450.php</a>
</p>
</li></ul>
<h1><a name="section_20">Background Writer</a></h1>
<h1><a name="section_21">Background Writer</a></h1>
<ul>
<li>Consider having the background writer update the transaction status
@ -1522,7 +1535,7 @@ first. There is also a developer's wiki at<br/>
<p> <a href="http://archives.postgresql.org/pgsql-patches/2007-06/msg00340.php">http://archives.postgresql.org/pgsql-patches/2007-06/msg00340.php</a>
</p>
</li></ul>
<h1><a name="section_21">Miscellaneous Performance</a></h1>
<h1><a name="section_22">Miscellaneous Performance</a></h1>
<ul>
<li>Do async I/O for faster random read-ahead of data
@ -1608,7 +1621,6 @@ first. There is also a developer's wiki at<br/>
</li><li>Sort large UPDATE/DELETEs so it is done in heap order
<p> <a href="http://archives.postgresql.org/pgsql-hackers/2008-01/msg01119.php">http://archives.postgresql.org/pgsql-hackers/2008-01/msg01119.php</a>
</p>
</li><li>-<em>Avoid tuple some tuple copying in sort routines</em>
</li><li>SMP scalability improvements
<p> <a href="http://archives.postgresql.org/pgsql-hackers/2007-07/msg00439.php">http://archives.postgresql.org/pgsql-hackers/2007-07/msg00439.php</a>
<a href="http://archives.postgresql.org/pgsql-hackers/2007-09/msg00206.php">http://archives.postgresql.org/pgsql-hackers/2007-09/msg00206.php</a>
@ -1616,11 +1628,6 @@ first. There is also a developer's wiki at<br/>
</p>
</li><li>Research reducing deTOASTing in more places
<p> <a href="http://archives.postgresql.org/pgsql-hackers/2007-09/msg00895.php">http://archives.postgresql.org/pgsql-hackers/2007-09/msg00895.php</a>
</p>
</li><li>Consider being smarter about memory and external files used during
sorts
<p> <a href="http://archives.postgresql.org/pgsql-hackers/2007-11/msg01101.php">http://archives.postgresql.org/pgsql-hackers/2007-11/msg01101.php</a>
<a href="http://archives.postgresql.org/pgsql-hackers/2007-12/msg00045.php">http://archives.postgresql.org/pgsql-hackers/2007-12/msg00045.php</a>
</p>
</li><li>Allow one transaction to see tuples using the snapshot of another
transaction
@ -1628,7 +1635,7 @@ first. There is also a developer's wiki at<br/>
<a href="http://archives.postgresql.org/pgsql-hackers/2008-01/msg00400.php">http://archives.postgresql.org/pgsql-hackers/2008-01/msg00400.php</a>
</p>
</li></ul>
<h1><a name="section_22">Source Code</a></h1>
<h1><a name="section_23">Source Code</a></h1>
<ul>
<li>Add use of 'const' for variables in source tree
@ -1653,7 +1660,6 @@ first. There is also a developer's wiki at<br/>
<p> <a href="http://archives.postgresql.org/pgsql-hackers/2006-09/msg02238.php">http://archives.postgresql.org/pgsql-hackers/2006-09/msg02238.php</a>
<a href="http://archives.postgresql.org/pgsql-patches/2006-10/msg00048.php">http://archives.postgresql.org/pgsql-patches/2006-10/msg00048.php</a>
</p>
</li><li>Consider detoasting keys before sorting
</li><li>Consider GnuTLS if OpenSSL license becomes a problem
<p> <a href="http://archives.postgresql.org/pgsql-patches/2006-05/msg00040.php">http://archives.postgresql.org/pgsql-patches/2006-05/msg00040.php</a>
<a href="http://archives.postgresql.org/pgsql-hackers/2006-12/msg01213.php">http://archives.postgresql.org/pgsql-hackers/2006-12/msg01213.php</a>
@ -1749,7 +1755,7 @@ 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_23">Exotic Features</a></h1>
<h1><a name="section_24">Exotic Features</a></h1>
<ul>
<li>Add pre-parsing phase that converts non-ISO syntax to supported
@ -1777,7 +1783,7 @@ first. There is also a developer's wiki at<br/>
<p> <a href="http://archives.postgresql.org/pgsql-hackers/2008-01/msg00893.php">http://archives.postgresql.org/pgsql-hackers/2008-01/msg00893.php</a>
</p>
</li></ul>
<h1><a name="section_24">Features We Do <u>Not</u> Want</a></h1>
<h1><a name="section_25">Features We Do <u>Not</u> Want</a></h1>
<ul>
<li>All backends running as threads in a single process (not wanted)