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Update italics on web site.

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Bruce Momjian 2005-05-16 23:35:42 +00:00
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doc/TODO
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PostgreSQL TODO List PostgreSQL TODO List
==================== ====================
Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us) Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
Last updated: Tue May 10 18:26:46 EDT 2005 Last updated: Mon May 16 19:35:37 EDT 2005
The most recent version of this document can be viewed at The most recent version of this document can be viewed at
http://www.postgresql.org/docs/faqs.TODO.html. http://www.postgresql.org/docs/faqs.TODO.html.

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doc/src/FAQ/TODO.html
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<body bgcolor="#FFFFFF" text="#000000" link="#FF0000" vlink="#A00000" alink="#0000FF"> <body bgcolor="#FFFFFF" text="#000000" link="#FF0000" vlink="#A00000" alink="#0000FF">
<h1><a name="section_1">PostgreSQL TODO List</a></h1> <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/> <p>Current maintainer: Bruce Momjian (<a href="mailto:pgman@candle.pha.pa.us">pgman@candle.pha.pa.us</a>)<br/>
Last updated: Tue May 10 18:26:46 EDT 2005 Last updated: Mon May 16 19:35:37 EDT 2005
</p> </p>
<p>The most recent version of this document can be viewed at<br/> <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>. <a href="http://www.postgresql.org/docs/faqs.TODO.html">http://www.postgresql.org/docs/faqs.TODO.html</a>.
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</li><li>Allow WAL replay of CREATE TABLESPACE to work when the directory </li><li>Allow WAL replay of CREATE TABLESPACE to work when the directory
structure on the recovery computer is different from the original structure on the recovery computer is different from the original
</li><li>Add "include file" functionality in postgresql.conf </li><li>Add "include file" functionality in postgresql.conf
</li><li>-Add session start time and last statement time to pg_stat_activity </li><li>*-Add session start time and last statement time to pg_stat_activity*
</li><li>Allow server logs to be remotely read using SQL commands </li><li>Allow server logs to be remotely read using SQL commands
</li><li>Allow pg_hba.conf settings to be controlled via SQL </li><li>Allow pg_hba.conf settings to be controlled via SQL
<p> This would require a new global table that is dumped to flat file for <p> This would require a new global table that is dumped to flat file for
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<p> This is useful for checking PITR recovery. <p> This is useful for checking PITR recovery.
</p> </p>
</li><li>Allow the PITR process to be debugged and data examined </li><li>Allow the PITR process to be debugged and data examined
</li><li>-Add the client IP address and port to pg_stat_activity </li><li>*-Add the client IP address and port to pg_stat_activity*
</li><li>Improve replication solutions </li><li>Improve replication solutions
<ul> <ul>
<li>Load balancing <li>Load balancing
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</p> </p>
</li><li>Add UNIQUE capability to non-btree indexes </li><li>Add UNIQUE capability to non-btree indexes
</li><li>Add rtree index support for line, lseg, path, point </li><li>Add rtree index support for line, lseg, path, point
</li><li>-Use indexes for MIN() and MAX() </li><li>*-Use indexes for MIN() and MAX()*
<p> MIN/MAX queries can already be rewritten as SELECT col FROM tab ORDER <p> MIN/MAX queries can already be rewritten as SELECT col FROM tab ORDER
BY col {DESC} LIMIT 1. Completing this item involves doing this BY col {DESC} LIMIT 1. Completing this item involves doing this
transformation automatically. transformation automatically.
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order. Another method would be to sort heap ctids matching the index order. Another method would be to sort heap ctids matching the index
before accessing the heap rows. before accessing the heap rows.
</p> </p>
</li><li>-Allow non-bitmap indexes to be combined by creating bitmaps in memory </li><li>*-Allow non-bitmap indexes to be combined by creating bitmaps in memory*
<p> This feature allows separate indexes to be ANDed or ORed together. This <p> This feature allows separate indexes to be ANDed or ORed together. This
is particularly useful for data warehousing applications that need to is particularly useful for data warehousing applications that need to
query the database in an many permutations. This feature scans an index query the database in an many permutations. This feature scans an index
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</li><li>Allow an alias to be provided for the target table in UPDATE/DELETE </li><li>Allow an alias to be provided for the target table in UPDATE/DELETE
<p> This is not SQL-spec but many DBMSs allow it. <p> This is not SQL-spec but many DBMSs allow it.
</p> </p>
</li><li>-Allow additional tables to be specified in DELETE for joins </li><li>*-Allow additional tables to be specified in DELETE for joins*
<p> UPDATE already allows this (UPDATE...FROM) but we need similar <p> UPDATE already allows this (UPDATE...FROM) but we need similar
functionality in DELETE. It's been agreed that the keyword should functionality in DELETE. It's been agreed that the keyword should
be USING, to avoid anything as confusing as DELETE FROM a FROM b. be USING, to avoid anything as confusing as DELETE FROM a FROM b.
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memory. This could exhaust memory for very large trigger queues. memory. This could exhaust memory for very large trigger queues.
This item involves dumping large queues into files. This item involves dumping large queues into files.
</p> </p>
</li><li>-Implement shared row locks and use them in RI triggers </li><li>*-Implement shared row locks and use them in RI triggers*
</li><li>Enforce referential integrity for system tables </li><li>Enforce referential integrity for system tables
</li><li>Change foreign key constraint for array -&gt; element to mean element </li><li>Change foreign key constraint for array -&gt; element to mean element
in array (?) in array (?)
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</p> </p>
</li><li>Consider use of open/fcntl(O_DIRECT) to minimize OS caching, </li><li>Consider use of open/fcntl(O_DIRECT) to minimize OS caching,
especially for WAL writes especially for WAL writes
</li><li>-Cache last known per-tuple offsets to speed long tuple access </li><li>*-Cache last known per-tuple offsets to speed long tuple access*
</li><li>Speed up COUNT(*) </li><li>Speed up COUNT(*)
<p> We could use a fixed row count and a +/- count to follow MVCC <p> We could use a fixed row count and a +/- count to follow MVCC
visibility rules, or a single cached value could be used and visibility rules, or a single cached value could be used and
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</li><li>Query execute plan </li><li>Query execute plan
</li><li>Query results </li><li>Query results
</li></ul> </li></ul>
</li><li>-Allow the size of the buffer cache used by temporary objects to be </li><li>*-Allow the size of the buffer cache used by temporary objects to be*
specified as a GUC variable specified as a GUC variable
<p> Larger local buffer cache sizes requires more efficient handling of <p> Larger local buffer cache sizes requires more efficient handling of
local cache lookups. local cache lookups.
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write lock. However, the read lock promotion to write lock could lead write lock. However, the read lock promotion to write lock could lead
to deadlock situations. to deadlock situations.
</p> </p>
</li><li>-Add a warning when the free space map is too small </li><li>*-Add a warning when the free space map is too small*
</li><li>Maintain a map of recently-expired rows </li><li>Maintain a map of recently-expired rows
<p> This allows vacuum to target specific pages for possible free space <p> This allows vacuum to target specific pages for possible free space
without requiring a sequential scan. without requiring a sequential scan.
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while on non-SMP machines, the backend should sleep so the process while on non-SMP machines, the backend should sleep so the process
holding the lock can complete and release it. holding the lock can complete and release it.
</p> </p>
</li><li>-Improve SMP performance on i386 machines </li><li>*-Improve SMP performance on i386 machines*
<p> i386-based SMP machines can generate excessive context switching <p> i386-based SMP machines can generate excessive context switching
caused by lock failure in high concurrency situations. This may be caused by lock failure in high concurrency situations. This may be
caused by CPU cache line invalidation inefficiencies. caused by CPU cache line invalidation inefficiencies.
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</li><li>Allow cross-compiling by generating the zic database on the target system </li><li>Allow cross-compiling by generating the zic database on the target system
</li><li>Improve NLS maintenace of libpgport messages linked onto applications </li><li>Improve NLS maintenace of libpgport messages linked onto applications
</li><li>Allow ecpg to work with MSVC and BCC </li><li>Allow ecpg to work with MSVC and BCC
</li><li>-Make src/port/snprintf.c thread-safe </li><li>*-Make src/port/snprintf.c thread-safe*
</li><li>Add xpath_array() to /contrib/xml2 to return results as an array </li><li>Add xpath_array() to /contrib/xml2 to return results as an array
</li><li>Allow building in directories containing spaces </li><li>Allow building in directories containing spaces
<p> This is probably not possible because 'gmake' and other compiler tools <p> This is probably not possible because 'gmake' and other compiler tools