|
|
|
|
@ -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: Mon May 16 19:35:37 EDT 2005 |
|
|
|
|
Last updated: Mon May 16 20:24:15 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>. |
|
|
|
|
@ -82,7 +82,7 @@ first. |
|
|
|
|
</li><li>Allow WAL replay of CREATE TABLESPACE to work when the directory |
|
|
|
|
structure on the recovery computer is different from the original |
|
|
|
|
</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>-<em>Add session start time and last statement time to pg_stat_activity</em> |
|
|
|
|
</li><li>Allow server logs to be remotely read using SQL commands |
|
|
|
|
</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 |
|
|
|
|
@ -122,7 +122,7 @@ first. |
|
|
|
|
<p> This is useful for checking PITR recovery. |
|
|
|
|
</p> |
|
|
|
|
</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>-<em>Add the client IP address and port to pg_stat_activity</em> |
|
|
|
|
</li><li>Improve replication solutions |
|
|
|
|
<ul> |
|
|
|
|
<li>Load balancing |
|
|
|
|
@ -185,20 +185,18 @@ first. |
|
|
|
|
</p> |
|
|
|
|
</li><li>Allow to_char() on interval values to accumulate the highest unit |
|
|
|
|
requested |
|
|
|
|
<p> Some special format flag would be required to request such |
|
|
|
|
accumulation. Such functionality could also be added to EXTRACT. |
|
|
|
|
Prevent accumulation that crosses the month/day boundary because of |
|
|
|
|
the uneven number of days in a month. |
|
|
|
|
</p> |
|
|
|
|
<ul> |
|
|
|
|
<li>to_char(INTERVAL '1 hour 5 minutes', 'MI') => 65 |
|
|
|
|
</li><li>to_char(INTERVAL '43 hours 20 minutes', 'MI' ) => 2600 |
|
|
|
|
</li><li>to_char(INTERVAL '43 hours 20 minutes', 'WK:DD:HR:MI') => 0:1:19:20 |
|
|
|
|
</li><li>to_char(INTERVAL '3 years 5 months','MM') => 41 |
|
|
|
|
</li></ul> |
|
|
|
|
</li></ul> |
|
|
|
|
<p> Some special format flag would be required to request such<br/> |
|
|
|
|
accumulation. Such functionality could also be added to EXTRACT. <br/> |
|
|
|
|
Prevent accumulation that crosses the month/day boundary because of<br/> |
|
|
|
|
the uneven number of days in a month. |
|
|
|
|
</p> |
|
|
|
|
<ul> |
|
|
|
|
<li>Add ISO INTERVAL handling |
|
|
|
|
</li><li>Add ISO INTERVAL handling |
|
|
|
|
<ul> |
|
|
|
|
<li>Add support for day-time syntax, INTERVAL '1 2:03:04' DAY TO SECOND |
|
|
|
|
</li><li>Add support for year-month syntax, INTERVAL '50-6' YEAR TO MONTH |
|
|
|
|
@ -279,7 +277,7 @@ first. |
|
|
|
|
</p> |
|
|
|
|
</li><li>Add UNIQUE capability to non-btree indexes |
|
|
|
|
</li><li>Add rtree index support for line, lseg, path, point |
|
|
|
|
</li><li>*-Use indexes for MIN() and MAX()* |
|
|
|
|
</li><li>-<em>Use indexes for MIN() and MAX()</em> |
|
|
|
|
<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 |
|
|
|
|
transformation automatically. |
|
|
|
|
@ -300,7 +298,7 @@ first. |
|
|
|
|
order. Another method would be to sort heap ctids matching the index |
|
|
|
|
before accessing the heap rows. |
|
|
|
|
</p> |
|
|
|
|
</li><li>*-Allow non-bitmap indexes to be combined by creating bitmaps in memory* |
|
|
|
|
</li><li>-<em>Allow non-bitmap indexes to be combined by creating bitmaps in memory</em> |
|
|
|
|
<p> This feature allows separate indexes to be ANDed or ORed together. This |
|
|
|
|
is particularly useful for data warehousing applications that need to |
|
|
|
|
query the database in an many permutations. This feature scans an index |
|
|
|
|
@ -345,7 +343,7 @@ first. |
|
|
|
|
</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> |
|
|
|
|
</li><li>*-Allow additional tables to be specified in DELETE for joins* |
|
|
|
|
</li><li>-<em>Allow additional tables to be specified in DELETE for joins</em> |
|
|
|
|
<p> UPDATE already allows this (UPDATE...FROM) but we need similar |
|
|
|
|
functionality in DELETE. It's been agreed that the keyword should |
|
|
|
|
be USING, to avoid anything as confusing as DELETE FROM a FROM b. |
|
|
|
|
@ -449,8 +447,8 @@ first. |
|
|
|
|
</p> |
|
|
|
|
</li><li>Allow COPY to understand \x as a hex byte |
|
|
|
|
</li><li>Have COPY return the number of rows loaded/unloaded (?) |
|
|
|
|
</li><li>-Allow COPY to optionally include column headings in the first line |
|
|
|
|
</li><li>-Allow COPY FROM ... CSV to interpret newlines and carriage |
|
|
|
|
</li><li>-<em>Allow COPY to optionally include column headings in the first line</em> |
|
|
|
|
</li><li>-<em>Allow COPY FROM ... CSV to interpret newlines and carriage</em> |
|
|
|
|
returns in data |
|
|
|
|
</li></ul> |
|
|
|
|
</li><li>CURSOR |
|
|
|
|
@ -491,7 +489,7 @@ first. |
|
|
|
|
<li>Allow PL/PgSQL's RAISE function to take expressions (?) |
|
|
|
|
<p> Currently only constants are supported. |
|
|
|
|
</p> |
|
|
|
|
</li><li>-Change PL/PgSQL to use palloc() instead of malloc() |
|
|
|
|
</li><li>-<em>Change PL/PgSQL to use palloc() instead of malloc()</em> |
|
|
|
|
</li><li>Handle references to temporary tables that are created, destroyed, |
|
|
|
|
then recreated during a session, and EXECUTE is not used |
|
|
|
|
<p> This requires the cached PL/PgSQL byte code to be invalidated when |
|
|
|
|
@ -582,7 +580,7 @@ first. |
|
|
|
|
memory. This could exhaust memory for very large trigger queues. |
|
|
|
|
This item involves dumping large queues into files. |
|
|
|
|
</p> |
|
|
|
|
</li><li>*-Implement shared row locks and use them in RI triggers* |
|
|
|
|
</li><li>-<em>Implement shared row locks and use them in RI triggers</em> |
|
|
|
|
</li><li>Enforce referential integrity for system tables |
|
|
|
|
</li><li>Change foreign key constraint for array -> element to mean element |
|
|
|
|
in array (?) |
|
|
|
|
@ -661,7 +659,7 @@ first. |
|
|
|
|
</p> |
|
|
|
|
</li><li>Consider use of open/fcntl(O_DIRECT) to minimize OS caching, |
|
|
|
|
especially for WAL writes |
|
|
|
|
</li><li>*-Cache last known per-tuple offsets to speed long tuple access* |
|
|
|
|
</li><li>-<em>Cache last known per-tuple offsets to speed long tuple access</em> |
|
|
|
|
</li><li>Speed up COUNT(*) |
|
|
|
|
<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 |
|
|
|
|
@ -684,7 +682,7 @@ first. |
|
|
|
|
</li><li>Query execute plan |
|
|
|
|
</li><li>Query results |
|
|
|
|
</li></ul> |
|
|
|
|
</li><li>*-Allow the size of the buffer cache used by temporary objects to be* |
|
|
|
|
</li><li>-<em>Allow the size of the buffer cache used by temporary objects to be</em> |
|
|
|
|
specified as a GUC variable |
|
|
|
|
<p> Larger local buffer cache sizes requires more efficient handling of |
|
|
|
|
local cache lookups. |
|
|
|
|
@ -715,7 +713,7 @@ first. |
|
|
|
|
write lock. However, the read lock promotion to write lock could lead |
|
|
|
|
to deadlock situations. |
|
|
|
|
</p> |
|
|
|
|
</li><li>*-Add a warning when the free space map is too small* |
|
|
|
|
</li><li>-<em>Add a warning when the free space map is too small</em> |
|
|
|
|
</li><li>Maintain a map of recently-expired rows |
|
|
|
|
<p> This allows vacuum to target specific pages for possible free space |
|
|
|
|
without requiring a sequential scan. |
|
|
|
|
@ -742,7 +740,7 @@ first. |
|
|
|
|
while on non-SMP machines, the backend should sleep so the process |
|
|
|
|
holding the lock can complete and release it. |
|
|
|
|
</p> |
|
|
|
|
</li><li>*-Improve SMP performance on i386 machines* |
|
|
|
|
</li><li>-<em>Improve SMP performance on i386 machines</em> |
|
|
|
|
<p> i386-based SMP machines can generate excessive context switching |
|
|
|
|
caused by lock failure in high concurrency situations. This may be |
|
|
|
|
caused by CPU cache line invalidation inefficiencies. |
|
|
|
|
@ -874,7 +872,7 @@ first. |
|
|
|
|
</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>Allow ecpg to work with MSVC and BCC |
|
|
|
|
</li><li>*-Make src/port/snprintf.c thread-safe* |
|
|
|
|
</li><li>-<em>Make src/port/snprintf.c thread-safe</em> |
|
|
|
|
</li><li>Add xpath_array() to /contrib/xml2 to return results as an array |
|
|
|
|
</li><li>Allow building in directories containing spaces |
|
|
|
|
<p> This is probably not possible because 'gmake' and other compiler tools |
|
|
|
|
|
Bruce Momjian
21 years ago