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Update TODO with lost change, mostly completed items and whitespace
corrections. Not sure why these were not in CVS. Researching.
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Bruce Momjian
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doc/TODO
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doc/TODO
@ -1,7 +1,7 @@
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PostgreSQL TODO List
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====================
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Current maintainer: Bruce Momjian (bruce@momjian.us)
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Last updated: Wed Aug 1 19:13:20 EDT 2007
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Last updated: Mon Aug 27 22:56:24 EDT 2007
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The most recent version of this document can be viewed at
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http://www.postgresql.org/docs/faqs.TODO.html.
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@ -20,7 +20,7 @@ http://developer.postgresql.org.
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Administration
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==============
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* Allow major upgrades without dump/reload, perhaps using pg_upgrade
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* Allow major upgrades without dump/reload, perhaps using pg_upgrade
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[pg_upgrade]
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* Check for unreferenced table files created by transactions that were
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in-progress when the server terminated abruptly
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@ -28,7 +28,7 @@ Administration
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http://archives.postgresql.org/pgsql-patches/2006-06/msg00096.php
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* Allow administrators to safely terminate individual sessions either
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via an SQL function or SIGTERM
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via an SQL function or SIGTERM
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Lock table corruption following SIGTERM of an individual backend
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has been reported in 8.0. A possible cause was fixed in 8.1, but
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@ -73,7 +73,7 @@ Administration
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Currently ALTER USER and ALTER DATABASE support per-user and
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per-database defaults. Consider adding per-user-and-database
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defaults so things like search_path can be defaulted for a
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defaults so things like search_path can be defaulted for a
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specific user connecting to a specific database.
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* Allow custom variable classes that can restrict who can set the values
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@ -171,11 +171,7 @@ Administration
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Monitoring
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==========
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* Allow server log information to be output as INSERT statements
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This would allow server log information to be easily loaded into
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a database for analysis.
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* -Allow server log information to be output as CSV format
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* -Add ability to monitor the use of temporary sort files
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@ -239,16 +235,16 @@ Data Types
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* Dates and Times
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o Allow infinite dates and intervals just like infinite timestamps
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o Merge hardwired timezone names with the TZ database; allow either
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o Merge hardwired timezone names with the TZ database; allow either
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kind everywhere a TZ name is currently taken
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o Allow TIMESTAMP WITH TIME ZONE to store the original timezone
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information, either zone name or offset from UTC [timezone]
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If the TIMESTAMP value is stored with a time zone name, interval
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If the TIMESTAMP value is stored with a time zone name, interval
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computations should adjust based on the time zone rules.
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o Fix SELECT '0.01 years'::interval, '0.01 months'::interval
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o Add a GUC variable to allow output of interval values in ISO8601
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o Add a GUC variable to allow output of interval values in ISO8601
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format
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o Have timestamp subtraction not call justify_hours()?
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@ -358,12 +354,12 @@ Functions
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requested
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Some special format flag would be required to request such
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accumulation. Such functionality could also be added to EXTRACT.
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accumulation. Such functionality could also be added to EXTRACT.
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Prevent accumulation that crosses the month/day boundary because of
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the uneven number of days in a month.
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o to_char(INTERVAL '1 hour 5 minutes', 'MI') => 65
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o to_char(INTERVAL '43 hours 20 minutes', 'MI' ) => 2600
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o to_char(INTERVAL '43 hours 20 minutes', 'MI' ) => 2600
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o to_char(INTERVAL '43 hours 20 minutes', 'WK:DD:HR:MI') => 0:1:19:20
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o to_char(INTERVAL '3 years 5 months','MM') => 41
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@ -531,7 +527,7 @@ SQL Commands
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creation
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* -Add RESET SESSION command to reset all session state
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* Add GUC to issue notice about statements that use unjoined tables
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* Allow EXPLAIN to identify tables that were skipped because of
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* Allow EXPLAIN to identify tables that were skipped because of
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constraint_exclusion
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* Allow EXPLAIN output to be more easily processed by scripts, perhaps XML
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* Enable standard_conforming_strings
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@ -670,8 +666,8 @@ SQL Commands
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On crash recovery, the table involved in the COPY would
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be removed or have its heap and index files truncated. One
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issue is that no other backend should be able to add to
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the table at the same time, which is something that is
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issue is that no other backend should be able to add to
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the table at the same time, which is something that is
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currently allowed.
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@ -795,7 +791,7 @@ SQL Commands
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o Add support for polymorphic arguments and return types to
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languages other than PL/PgSQL
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o Add capability to create and call PROCEDURES
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o Add support for OUT and INOUT parameters to languages other
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o Add support for OUT and INOUT parameters to languages other
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than PL/PgSQL
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o Add PL/PythonU tracebacks
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@ -843,7 +839,7 @@ Clients
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than toggle
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o Consistently display privilege information for all objects in psql
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o Add auto-expanded mode so expanded output is used if the row
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length is wider than the screen width.
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length is wider than the screen width.
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Consider using auto-expanded mode for backslash commands like \df+.
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@ -913,13 +909,13 @@ Clients
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o Add PQescapeIdentifierConn()
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o Prevent PQfnumber() from lowercasing unquoted the column name
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PQfnumber() should never have been doing lowercasing, but
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PQfnumber() should never have been doing lowercasing, but
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historically it has so we need a way to prevent it
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o Allow statement results to be automatically batched to the client
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Currently all statement results are transferred to the libpq
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client before libpq makes the results available to the
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client before libpq makes the results available to the
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application. This feature would allow the application to make
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use of the first result rows while the rest are transferred, or
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held on the server waiting for them to be requested by libpq.
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@ -1123,20 +1119,27 @@ Cache Usage
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* Allow data to be pulled directly from indexes
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Currently indexes do not have enough tuple visibility information
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to allow data to be pulled from the index without also accessing
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the heap. One way to allow this is to set a bit on index tuples
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to indicate if a tuple is currently visible to all transactions
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when the first valid heap lookup happens. This bit would have to
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be cleared when a heap tuple is expired.
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Currently indexes do not have enough tuple visibility information
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to allow data to be pulled from the index without also accessing
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the heap. One way to allow this is to set a bit on index tuples
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to indicate if a tuple is currently visible to all transactions
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when the first valid heap lookup happens. This bit would have to
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be cleared when a heap tuple is expired.
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Another idea is to maintain a bitmap of heap pages where all rows
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are visible to all backends, and allow index lookups to reference
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are visible to all backends, and allow index lookups to reference
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that bitmap to avoid heap lookups, perhaps the same bitmap we might
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add someday to determine which heap pages need vacuuming. Frequently
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accessed bitmaps would have to be stored in shared memory. One 8k
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page of bitmaps could track 512MB of heap pages.
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A third idea would be for a heap scan to check if all rows are visible
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and if so set a per-table flag which can be checked by index scans.
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Any change to the table would have to clear the flag. To detect
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changes during the heap scan a counter could be set at the start and
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checked at the end --- if it is the same, the table has not been
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modified --- any table change would increment the counter.
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* Consider automatic caching of statements at various levels:
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o Parsed query tree
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@ -1215,12 +1218,17 @@ Vacuum
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http://archives.postgresql.org/pgsql-hackers/2006-06/msg01305.php
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http://archives.postgresql.org/pgsql-hackers/2006-06/msg01534.php
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* Reuse index tuples that point to heap tuples that are not visible to
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* Reuse index tuples that point to heap tuples that are not visible to
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anyone?
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* Improve dead row detection during multi-statement transactions usage
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http://archives.postgresql.org/pgsql-patches/2007-03/msg00358.php
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* Reduce XID consumption of read-only queries
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http://archives.postgresql.org/pgsql-hackers/2007-08/msg00516.php
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* Auto-vacuum
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o Use free-space map information to guide refilling
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@ -1335,19 +1343,19 @@ Write-Ahead Log
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might be dropped or truncated during crash recovery [walcontrol]
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Allow tables to bypass WAL writes and just fsync() dirty pages on
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commit. This should be implemented using ALTER TABLE, e.g. ALTER
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TABLE PERSISTENCE [ DROP | TRUNCATE | DEFAULT ]. Tables using
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non-default logging should not use referential integrity with
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commit. This should be implemented using ALTER TABLE, e.g. ALTER
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TABLE PERSISTENCE [ DROP | TRUNCATE | DEFAULT ]. Tables using
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non-default logging should not use referential integrity with
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default-logging tables. A table without dirty buffers during a
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crash could perhaps avoid the drop/truncate.
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* Allow WAL logging to be turned off for a table, but the table would
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avoid being truncated/dropped [walcontrol]
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To do this, only a single writer can modify the table, and writes
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To do this, only a single writer can modify the table, and writes
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must happen only on new pages so the new pages can be removed during
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crash recovery. Readers can continue accessing the table. Such
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tables probably cannot have indexes. One complexity is the handling
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crash recovery. Readers can continue accessing the table. Such
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tables probably cannot have indexes. One complexity is the handling
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of indexes on TOAST tables.
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@ -1373,7 +1381,7 @@ Optimizer / Executor
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This might replace GEQO, http://sixdemonbag.org/Djinni.
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* Improve merge join performance by allowing mark/restore of
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* Improve merge join performance by allowing mark/restore of
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tuple sources
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http://archives.postgresql.org/pgsql-hackers/2007-01/msg00096.php
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@ -1411,7 +1419,7 @@ Miscellaneous Performance
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o -Support a smaller header for short variable-length fields
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o Reduce the row header size?
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o Consider reducing on-disk varlena length from four bytes to
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o Consider reducing on-disk varlena length from four bytes to
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two because a heap row cannot be more than 64k in length
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* Consider increasing NUM_CLOG_BUFFERS
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@ -1486,7 +1494,7 @@ Source Code
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* -Move NAMEDATALEN from postgres_ext.h to pg_config_manual.h
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* Consider making NAMEDATALEN more configurable in future releases
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* Update our code to handle 64-bit timezone files to match the zic
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* Update our code to handle 64-bit timezone files to match the zic
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source code, which now uses them
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* Have configure choose integer datetimes by default
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@ -1597,6 +1605,6 @@ Features We Do _Not_ Want
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While PostgreSQL clients runs fine in limited-resource environments, the
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server requires multiple processes and a stable pool of resources to
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run reliabily and efficiently. Stripping down the PostgreSQL server
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to run in the same process address space as the client application
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run reliabily and efficiently. Stripping down the PostgreSQL server
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to run in the same process address space as the client application
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would add too much complexity and failure cases.
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