7.1 features list - Mailing list pgsql-hackers

Here is the list of features in 7.1.
--
  Bruce Momjian                        |  http://candle.pha.pa.us
  pgman@candle.pha.pa.us               |  (610) 853-3000
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  +  Christ can be your backup.        |  Drexel Hill, Pennsylvania 19026
Release 7.1

This release focuses on removing limitations that have existed in the
PostgreSQL code for many years.

Major changes in this release:

    Write-ahead Log(WAL) - To maintain database consistency in case
of an operating system crash, previous releases of PostgreSQL have
forced all data modifications to disk before each transaction commit.
With WAL, only one log file must be flushed to disk, greatly improving
performance.  If you have been using -F in previous releases to disable
disk flushes, you may want to consider discontinuing its use.

    TOAST - Previous releases had an 8k (or 32k) row length limit.
This limit made storage of long text fields difficult.  With TOAST, long
rows of any length can be stored with good performance.

    Outer Joins - We now support outer joins.  The UNION/NOT IN
workaround for outer joins is no longer required.  We use the SQL92
outer join syntax.

    Function Manager - The previous C function manager did not
handle NULLs properly, nor did it support 64-bit CPU's.  The new
function manager does.  You can continue using your old custom
functions, but you may want to rewrite them in the future to use the new
function manager call interface.

    Complex Queries - A large number of complex queries that were
unsupported in previous releases now work.  Many combinations of views,
aggregates, UNION, LIMIT, cursors, subqueries, and inherited tables
now work properly. Inherited tables are now accessed by default.
Subqueries in FROM are now supported.

Migration to v7.0

   A dump/restore using pg_dump is required for those wishing to migrate
   data from any previous release.



Last updated from CVS logs:  2000-12-11

Bug Fixes
---------
Many multi-byte/Unicode/locale fixes (Tatsuo and others)
More reliable ALTER TABLE RENAME (Tom)
Kerberos V fixes (David Wragg)
Fix for INSERT INTO...SELECT where targetlist has subqueries (Tom)
Prompt username/password on standard error (Bruce)
Large objects inv_read/inv_write fixes (Tom)
Fixes for to_char(), to_date(), to_ascii(), and to_timestamp() (Karel,
    Daniel Baldoni)
Prevent query expressions from leaking memory (Tom)
Allow UPDATE of arrays elements (Tom)
Wake up lock waiters during cancel (Hiroshi)
Fix rare cursor crash when using hash join (Tom)
Fix for DROP TABLE/INDEX in rolled-back transaction (Hiroshi)
Fix psql crash from \l+ if MULTIBYTE enabled (Peter E)
Fix truncation of rule names during CREATE VIEW (Ross Reedstrom)
Fix PL/perl (Alex Kapranoff)
Disallow LOCK on views (Mark Holloman)
Disallow INSERT/UPDATE/DELETE on views (Mark Holloman)
Disallow DROP RULE, CREATE INDEX, TRUNCATE on views (Mark Holloman)
Allow PL/pgSQL accept non-ASCII identifiers (Tatsuo)
Allow views to proper handle GROUP BY, aggregates, DISTINCT (Tom)
Fix rare failure with TRUNCATE command (Tom)
Allow UNION/INTERSECT/EXCEPT to be used with ALL, subqueries, views,
    DISTINCT, ORDER BY, SELECT...INTO (Tom)
Fix parser failures during aborted transactions (Tom)
Allow temporary relations to properly clean up indexes (Bruce)
Fix VACUUM problem with moving rows in same page (Tom)
Modify pg_dump so it dumps only user-defined items, not system-defined (Philip)
Allow LIMIT in VIEW (Tom)
Require cursor FETCH to honor LIMIT (Tom)
Allow PRIMARY/FOREIGN Key definitions on inherited columns (Stephan)
Allow ORDER BY, LIMIT in sub-selects (Tom)
Allow UNION in CREATE RULE (Tom)
Make DROP TABLE rollback-able (Tom)
Store initdb collation in pg_control so collation cannot be changed (Tom)
Fix INSERT...SELECT with rules (Tom)
Fix FOR UPDATE inside views and subselects (Tom)
Fix OVERLAPS operators conform to SQL92 spec regarding NULLs (Tom)
Fix lpad() and rpad() to handle length less than input string (Tom)

Enhancements
------------
Add OUTER JOINs (Tom)
Function manager overhaul (Tom)
Allow ALTER TABLE RENAME on indexes(Tom)
Improve CLUSTER(Tom)
Improve ps status display for more platforms(Marc)
Improve CREATE FUNCTION failure message(Ross)
JDBC improvements (Peter, Travis Bauer, Christopher Cain, William Webber,
    Gunnar)
Grand Unified Configuration scheme/GUC.  Many options can now be set in
    data/postgresql.conf, postmaster/postgres flags, or SET commands (Peter E)
Improved handling of file descriptor cache (Tom)
New warning code about auto-created table alias entries (Bruce)
Overhaul initdb process (Tom, Peter E)
Overhaul of inherited tables; inherited tables now accessed by default;
   new ONLY keyword prevents it (Chris Bitmead, Tom)
ODBC cleanups/improvements (Nick Gorham, Stephan Szabo, Zoltan Kovacs,
    Michael Fork)
Allow renaming of temp tables (Tom)
Overhaul memory manager contexts (Tom)
pg_dump uses CREATE USER or CREATE GROUP rather using COPY (Peter E)
Overhaul pg_dump (Philip Warner)
Allow pg_hba.conf secondary password file to specify username (Peter E)
Allow TEMPORARY or TEMP keyword when creating temporary tables (Bruce)
New memory leak checker (Karel)
New SET SESSION CHARACTERISTICS and SET DefaultXactIsoLevel (Thomas, Peter E)
Allow nested block comments (Thomas)
Add WITHOUT TIME ZONE type qualifier (Thomas)
New ALTER TABLE ADD CONSTRAINT (Stephan)
Use NUMERIC accumulators for INTEGER aggregates (Tom)
Overhaul aggregate code (Tom)
New VARIANCE and STDDEV() aggregates
Improve dependency ordering of pg_dump (Philip)
New pg_restore command (Philip)
New pg_dump tar output option (Philip)
New pg_dump of large objects  (Philip)
New ESCAPE option to LIKE (Thomas)
New case-insensitive LIKE - ILIKE (Thomas)
Allow functional indexes to use binary-compatible type (Tom)
Allow SQL functions to be used in more contexts (Tom)
New pg_config utility (Peter E)
New PL/pgSQL EXECUTE command which allows dynamic SQL and utility statements
    (Jan)
New PL/pgSQL GET DIAGNOSTICS statement for SPI value access (Jan)
New quote_identifiers() and quote_literal() functions (Jan)
New ALTER TABLE table OWNER TO user command (Mark Holloman)
Allow subselects in FROM, i.e. FROM (SELECT ...) [AS] alias (Tom)
Update PyGreSQL to version 3.1 (D'Arcy)
Store tables as files named by OID (Vadim)
New SQL function setval(seq,val,bool) for use in pg_dump (Philip)
New pg_service.conf file (Mario Weilguni)
Require DROP VIEW to remove views, no DROP TABLE (Mark)
Allow DROP VIEW view1, view2 (Mark)
Allow multiple objects in DROP INDEX, DROP RULE, and DROP TYPE (Tom)
Allow automatic conversion to Unicode (Tatsuo)
New /contrib/pgcrypto hashing functions (Marko Kreen)
New pg_dumpall --accounts-only option (Peter E)
New CHECKPOINT command for WAL which creates new WAL log file (Vadim)
New AT TIME ZONE syntax (Thomas)
Allow location of Unix domain socket to be configurable (David J. MacKenzie)
Allow postmaster to listen on a specific IP address (David J. MacKenzie)
Allow socket path name to be specified in hostname by using leading slash
    (David J. MacKenzie)
Allow CREATE DATABASE to specify template database (Tom)
New template0 database that contains no user additions(Tom)

Types
-----
Fix INET/CIDR type ordering and add new functions (Tom)
Make OID behave as an unsigned type (Tom)
Allow BIGINT as synonym for INT8 (Peter E)
New int2 and int8 comparison operators (Tom)
New BIT and BIT VARYING types (Adriaan Joubert, Tom)
CHAR() no longer faster than VARCHAR() because of TOAST (Tom)

Performance
-----------
Write-Ahead Log (WAL) to provide crash recovery with less performance
    overhead (Vadim)
ANALYZE stage of VACUUM no longer exclusively locks table (Bruce)
Reduced file seeks (Denis Perchine)
Improve BTREE code for duplicate keys (Tom)
Store all large objects in a single operating system file (Denis Perchine, Tom)
Improve memory allocation performance (Karel, Tom)

Source Code
-----------
New function manager call conventions (Tom)
SGI portability fixes (David Kaelbling)
New configure --enable-syslog option (Marc)
New BSDI README (Bruce)
configure script moved to top level, not /src (Peter E)
Makefile/configuration/compilation cleanups (Peter E)
New configure --with-python option (Peter E)
Solaris cleanups (Peter E)
Overhaul /contrib Makefiles (Karel)
New OpenSSL configuration option (Magnus, Peter E)
AIX fixes (Andreas)
New heap_open(), heap_openr() API (Tom)
Remove colon and semi-colon operators (Thomas)
New pg_class.relkind value for views (Mark Holloman)
Rename ichar() to chr() (Karel)
New documentation for btrim(), ascii(), chr(), repeat() (Karel)
Fixes for NT/Cygwin (Pete Forman)
AIX port fixes (Andreas)
New BeOS port (David Reid, Cyril Velter)
Add proofreader's changes to docs (Addison-Wesley, Bruce)
New Alpha spinlock code (Adriaan Joubert, Compaq)
Unixware port overhaul (Peter E)
New Darwin/Mac OSX port (Bruce Hartzler)
New FreeBSD Alpha port (Alfred)
Overhaul shared memory segments (Tom)
Add IBM S/390 support (Neale Ferguson)