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Release notes updates from Neil Conway.

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Bruce Momjian
2003-10-22 17:27:14 +00:00
parent 70f567d571
commit 269df29e8b
2 changed files with 78 additions and 182 deletions
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@ -2,12 +2,24 @@
Release Notes
Release 7.4
_________________________________________________________________
Overview
Major changes in this release:
Performance
IN/NOT IN subqueries are now much more efficient
Improved GROUP BY processing by using hash buckets
New multi-key hash join capability
ANSI joins are now better optimized
Faster and more powerful regular expression code
Function-inlining for simple SQL functions
IPv6
Full support for IPv6 connections and IPv6 address data types
@ -19,7 +31,9 @@
and other free space management improvements.
Standards Compliance
Implement information schema Support for read-only transactions
Implement information schema
Support for read-only transactions
Make cursors comply more closely with the SQL standard
@ -28,19 +42,6 @@
error codes, status information, a binary protocol, error
reporting verbosity, and cleaner startup packets.
Performance
IN/NOT IN subqueries now perform as efficiently as joins
Improved GROUP BY processing by using hash buckets
New multi-key hash join capability
ANSI joins are now better optimized
Faster and more powerful regular expression code
Function-inlining for simple SQL functions
Holdable Cursors
Allow cursors to exist outside transactions
@ -67,8 +68,8 @@
in client applications and languages.
* Error message wording has changed substantially in this release,
and error codes have been added.
* ANSI joins may behave differently because they are now better
optimized
* ANSI inner joins may behave differently because they are now
better optimized
* A number of server variables have been renamed for clarity
* MOVE/FETCH 0 now does nothing; return value of MOVE/FETCH 1/0
varies based on the current offset in the cursor
@ -144,11 +145,12 @@ Performance
* Assume WHERE a.x = b.y and b.y = 42 also means a.x = 42 (Tom)
* Allow hash/merge joins on complex joins (Tom)
* Allow hash joins for more data types (Tom)
* Allow join optimization of ANSI joins, disable with
* Allow join optimization of ANSI inner joins, disable with
join_collapse_limit (Tom)
* Add from_collapse_limit to control conversion of subqueries to
joins (Tom)
* Use faster regular expression code from TCL (Henry Spencer, Tom)
* Use faster and more powerful regular expression code from TCL
(Henry Spencer, Tom)
* Use bit-mapped relation sets in the optimizer (Tom)
* Improve backend startup time (Tom)
* Improve trigger/constraint performance (Stephan)
@ -157,6 +159,8 @@ Performance
* Improve hash index concurrency and speed (Tom)
* Align shared buffers on 32-byte boundary for copy speed
improvement (Manfred Spraul)
* The NUMERIC datatype has been reimplemented for better performance
(Tom)
_________________________________________________________________
Server Configuration
@ -182,11 +186,11 @@ Server Configuration
* New is_superuser read-only variable (Tom)
* New server-side parameter log_error_verbosity to control error
detail (Tom)
* postgres --help-config now dumps server config variables (Aizaz
Ahmed)
* postgres --describe-config now dumps server config variables
(Aizaz Ahmed, Peter)
* Make default shared_buffers 1000 and max_connections 100, if
possible (Tom)
* Add new columns in pg_settings: context, type, source , min_val,
* Add new columns in pg_settings: context, type, source, min_val,
max_val (Joe)
* New pg_hba.conf 'hostnossl' to prevent SSL connections (Jon
Jensen)
@ -237,10 +241,10 @@ Object Manipulation
Utility Commands
* Add ON COMMIT PRESERVE ROWS for temp tables (Gavin)
* Add ON COMMIT clause to CREATE TABLE for temp tables (Gavin)
* Allow cursors outside transactions using WITH HOLD (Neil)
* Make MOVE/FETCH 0 actually move/fetch 0 (Bruce)
* Cause FETCH 1 to return the current cursor row, or zero if at
* Cause FETCH 1 to return the next cursor row number, or zero if at
beginning/end of cursor, per SQL spec (Bruce)
* Have MOVE return 0 or 1 depending on cursor position (Bruce)
* Properly handle SCROLL with cursors, or report an error (Neil)
@ -277,7 +281,8 @@ Utility Commands
* Improve VACUUM performance on indexes by reducing WAL traffic
(Tom)
* Allow pg_ctl to better handle non-standard ports (Greg)
* Functional indexes now support indexes on column expressions (Tom)
* Functional indexes have been generalized into expressional indexes
(Tom)
* Syntax errors now reported as 'syntax error' rather than 'parse
error' (Tom)
* Have SHOW TRANSACTION_ISOLATION match input to SET
@ -289,6 +294,7 @@ Utility Commands
indexes (Tom)
* pg_dump --use-set-session-authorization and --no-reconnect now do
nothing, all dumps use SET SESSION AUTHORIZATION
* Long options for pg_dump are now available on all platforms
_________________________________________________________________
Data Types and Functions
@ -331,8 +337,7 @@ Data Types and Functions
* Allow the creation of special LIKE indexes for non-C locales
(Peter)
* Disallow invalid timezone names (Tom)
* Trim trailing spaces when CHAR() data is cast to VARCHAR or TEXT
(Tom)
* Trim trailing spaces when CHAR() is cast to VARCHAR or TEXT (Tom)
* Make FLOAT(p) measure the precision p in bits, not decimal digits
(Tom)
* Add IPv6 support to the inet and cidr data types (Michael Graff)
@ -340,7 +345,6 @@ Data Types and Functions
(Michael Graff)
* Have SHOW DATESTYLE generate output similar to that used by SET
DATESTYLE (Tom)
* Change DATESTYLE to output its value in a more common format (Tom)
* Make EXTRACT(TIMEZONE) and SET/SHOW TIMEZONE follow the SQL
convention for the sign of timezone offsets, ie, positive is east
from UTC (Tom)
@ -387,7 +391,8 @@ Psql
* Add "\pset pager always" to always use pager (Greg)
* Improve tab completion (Rod, Ross Reedstrom, Ian Barwick)
* Reorder \? help into groupings (Harald Armin Massa, Bruce)
* Add schema, cast, and conversion backslash commands (Christopher)
* Add backslash commands for listing schemas, casts, and conversions
(Christopher)
* \encoding now changes based on client_encoding server variable
(Tom)
* Save edit history into readline history (Ross)
@ -396,6 +401,7 @@ Psql
* New '\set AUTOCOMMIT off' capability (Tom)
* New '\set VERBOSITY' to control error detail (Tom)
* New %T prompt string to show transaction status (Tom)
* Long options for psql are now available on all platforms
_________________________________________________________________
Libpq
@ -448,7 +454,7 @@ Source Code
files (Tom)
* Improved PPC locking primitive (Reinhard Max)
* Embed LD_LIBRARY_PATH used for build process into binaries (Billy)
* New palloc0 to allocate and clear memory (Bruce)
* New palloc0 function to allocate and clear memory (Bruce)
* Fix locking code for s390x CPU (64-bit) (Tom)
* Allow OpenBSD to use local ident credentials (William Ahern)
* Make query plan trees read-only to executor (Tom)
@ -457,7 +463,8 @@ Source Code
Karl Waclawek)
* Use our own version of getopt_long() if needed (Peter)
* Convert administration scripts to C (Peter)
* Bison >=1.85 is now required for grammar changes
* Bison >= 1.85 is now required to build the PostgreSQL grammar, if
building from CVS
* Merge documentation into one book (Peter)
* Add Win32 compatibility functions (Bruce)
* Allow client interfaces to compile under MinGW/Win32 (Bruce)
@ -465,7 +472,7 @@ Source Code
* Support Intel Linux compiler (Peter)
* Improve Linux startup scripts (Slawomir Sudnik, Darko Prenosil)
* Add support for AMD Opteron and Itanium (Jeffrey W. Baker, Bruce)
* Remove configure --enable-recode
* Remove --enable-recode option to configure
* Generate a compile error if spinlock code is not found (Bruce)
_________________________________________________________________
@ -500,60 +507,11 @@ Contrib
Other Uncategorized
* EXTRACT(TIMEZONE) and "SET/SHOW TIMEZONE " now follow SQL sign
convention (positive = east of UTC)
* "DATESTYLE" can now be set to DMY, YMD, or MDY to specify input
field order
* Input date order must now be YYYY-MM-DD (with 4-digit year) or
match DATESTYLE
* Output of "SHOW DATESTYLE" is now in the same format accepted by
"SET DATESTYLE"
* PL/Python is now an untrusted language, and is renamed to
plpythonu
* Dollar sign ($) is no longer allowed in operator names
* Dollar sign ($) can be a non-first character in identifiers
* Precision in FLOAT(p) is now interpreted as bits, not decimal
digits
* Functional indexes have been generalized into expressional indexes
* CHAR(n) to TEXT conversion automatically strips trailing blanks
* Pattern matching operations can use indexes regardless of locale
* New frontend/backend protocol supports many long-requested
features
* "SET AUTOCOMMIT TO OFF" is no longer supported; psql has an
AUTOCOMMIT variable
* Reimplementation of NUMERIC datatype for more speed
* New regular expression package, many more regexp features (most of
Perl5)
* Can now do " EXPLAIN" ... "EXECUTE" to see plan used for a
prepared query
* Explicit "JOIN"s no longer constrain query plan, unless
"JOIN_COLLAPSE_LIMIT = 1"
* Performance of "foo IN (SELECT ...)" queries has been considerably
improved
* "FETCH 0" now re-fetches cursor's current row, per SQL spec
* Revised executor state representation; plan trees are read-only to
executor now
* Information schema
* Domains now support "CHECK" constraints
* psql backslash commands for listing conversions, casts, and
schemas
* "TRUNCATE TABLE" is transaction-safe
* "CLUSTER" can re-cluster a previously clustered table, or all such
tables
* Statement-level triggers
* System can use either hash- or sort-based strategy for grouped
aggregation
* "ON COMMIT" options for temp tables
* extra_float_digits option allows pg_dump to dump float data
accurately
* Long options for psql and pg_dump are now available on all
platforms
* Read-only transactions
* Object owners can allow grantees to grant the privilege to others
(grant option)
* Added "contrib" module for pg_autovacuum which monitors inserts
and deletes, and does "ANALYZE" or " VACUUM ANALYZE " when
quantities exceed specified thresholds.
_________________________________________________________________
Release 7.3.4