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Update release notes for 6.5.
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Bruce Momjian
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<Chapter Id="release">
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<Title>Release Notes</Title>
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<Sect1>
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<Title>Release 6.5</Title>
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<!--
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<docinfo>
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<authorgroup>
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<author>
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<firstname>Bruce</firstname>
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<surname>Momjian</surname>
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</author>
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</authorgroup>
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<date>1998-06-01</date>
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</docinfo>
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-->
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<para>
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This release marks the development team's final mastery of the source
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code we inherited from Berkeley. You will see we are now easily adding
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major features, thanks to the increasing size and experience of our
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world-wide development team: Here is a brief, incomplete summary:
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<itemizedlist spacing="compact">
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<listitem>
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<para>
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Multi-version concurrency control(MVCC): This removes our old
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table-level locking, and replaces it with a locking system that is
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superior to most commercial database systems. In a traditional system,
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each row that is modified is locked until committed, preventing reads by
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other users. MVCC uses the natural multi-version nature of PostgreSQL
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to allow readers to continue reading consistent data during writer
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activity. Writers continue to use the compact pg_log transaction
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system. This is all preformed without having to allocate a lock for
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every row like traditional database systems. So, basically, we no
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longer have table-level locking, we have something better than row-level
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locking.
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</para>
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</listitem>
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<listitem>
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<para>
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Numeric data type: We now have a true numeric data type, with
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user-specified precision.
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</para>
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</listitem>
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<listitem>
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<para>
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Temporary tables: Temporary tables are guaranteed to have unique names
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within a database session, and are destroyed on session exit.
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</para>
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</listitem>
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<listitem>
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<para>
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New SQL features: We now have CASE, INTERSECT, and EXCEPT statement
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support. We have new LIMIT/OFFSET, SET TRANSACTION ISOLATION LEVEL,
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SELECT ... FOR UPDATE, and an improved LOCK command.
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</para>
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</listitem>
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<listitem>
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<para>
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Speedups: We continue to speed up PostgreSQL, thanks to the variety of
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talents within our team. We have sped up memory allocation,
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optimization, table joins, and row transfers routines.
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</para>
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</listitem>
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<listitem>
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<para>
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Other: We continue to expand our port list, this time including
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Win32/NT. Most interfaces have new versions, and existing functionality
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has been improved.
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</para>
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</listitem>
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</itemizedlist>
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</para>
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<sect2>
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<title>Migration to v6.5</title>
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<para>
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A dump/restore using <application>pg_dump</application>
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or <application>pg_dumpall</application>
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is required for those wishing to migrate data from any
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previous release of <productname>Postgres</productname>.
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</para>
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</sect2>
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<sect2>
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<title>Detailed Change List</title>
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<para>
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<programlisting>
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Bug Fixes
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---------
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Fix text<->float8 and text<->float4 conversion functions(Thomas)
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Fix for creating tables with mixed-case constraints(Billy)
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Change exp()/pow() behavior to generate error on underflow/overflow(Jan)
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Fix bug in pg_dump -z
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Memory overrun cleanups(Tatsuo)
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Fix for lo_import crash(Tatsuo)
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Adjust handling of data type names to suppress double quotes(Thomas)
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Use type coersion for matching columns and DEFAULT(Thomas)
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Fix deadlock so it only checks once after one second of sleep(Bruce)
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Fixes for aggregates and PL/pgsql(Hiroshi)
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Fix for subquery crash(Vadim)
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Fix for libpq function PQfnumber and case-insensitive names(Bahman Rafatjoo)
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Fix for large object write-in-middle, no extra block, memory consumption(Tatsuo)
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Fix for pg_dump -d or -D and quote special characters in INSERT
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Repair serious problems with dynahash(Tom)
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Fix INET/CIDR portability problems
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Fix problem with selectivity error in ALTER TABLE ADD COLUMN(Bruce)
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Fix executor so mergejoin of different column types works(Tom)
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Fix for Alpha OR selectivity bug
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Fix OR index selectivity problem(Bruce)
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Fix so \d shows proper length for char()/varchar()(Ryan)
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Fix tutorial code(Clark)
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Improve destroyuser checking(Oliver)
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Fix for Kerberos(Rodney McDuff)
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Fix for dropping database while dirty buffers(Bruce)
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Fix so sequence nextval() can be case-sensitive(Bruce)
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Fix !!= operator
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Drop buffers before destroying database files(Bruce)
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Fix case where executor evaluates functions twice(Tatsuo)
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Allow sequence nextval actions to be case-sensitive(Bruce)
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Fix optimizer indexing not working for negative numbers(Bruce)
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Fix for memory leak in executor with fjIsNull
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Fix for aggregate memory leaks(Erik Riedel)
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Allow username containing a dash GRANT permissions
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Cleanup of NULL in inet types
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Clean up system table bugs(Tom)
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Fix problems of PAGER and \? command(Masaaki Sakaida)
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Reduce default multi-segment file size limit to 1GB(Peter)
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Fix for dumping of CREATE OPERATOR(Tom)
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Fix for backward scanning of cursors(Hiroshi Inoue)
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Fix for COPY FROM STDIN when using \i(Tom)
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Fix for subselect is compared inside an expression(Jan)
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Fix handling of error reporting while returning rows(Tom)
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Fix problems with reference to array types(Tom,Jan)
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Prevent UPDATE SET oid(Jan)
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Fix pg_dump so -t option can handle case-sensitive tablenames
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Fixes for GROUP BY in special cases(Tom, Jan)
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Fix for memory leak in failed queries(Tom)
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DEFAULT now supports mixed-case identifiers(Tom)
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Fix for multi-segment uses of DROP/RENAME table, indexes(Ole Gjerde)
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Enhancements
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------------
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Add "vacuumdb" utility
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Speed up libpq by allocating memory better(Tom)
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EXPLAIN all indices used(Tom)
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Implement CASE, COALESCE, NULLIF expression(Thomas)
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New pg_dump table output format(Constantin)
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Add string min()/max() functions(Thomas)
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Extend new type coersion techniques to aggregates(Thomas)
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New moddatetime contrib(Terry)
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Update to pgaccess 0.96(Constantin)
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Add routines for single-byte "char" type(Thomas)
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Improved substr() function(Thomas)
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Improved multi-byte handling(Tatsuo)
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Multi-version concurrency control/MVCC(Vadim)
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New Serialized mode(Vadim)
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Fix for tables over 2gigs(Peter)
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New SET TRANSACTION ISOLATION LEVEL(Vadim)
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New LOCK TABLE IN ... MODE(Vadim)
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Update ODBC driver(Byron)
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New NUMERIC data type(Jan)
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New SELECT FOR UPDATE(Vadim)
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Handle "NaN" and "Infinity" for input values(Jan)
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Improved date/year handling(Thomas)
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Improved handling of backend connections(Magnus)
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New options ELOG_TIMESTAMPS and USE_SYSLOG options for log files(Massimo)
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New TCL_ARRAYS option(Massimo)
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New INTERSECT and EXCEPT(Stefan)
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New pg_index.indisprimary for primary key tracking(D'Arcy)
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New pg_dump option to allow dropping of tables before creation(Brook)
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Speedup of row output routines(Tom)
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New READ COMMITTED isolation level(Vadim)
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New TEMP tables/indexes(Bruce)
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Prevent sorting if result is already sorted(Jan)
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New memory allocation optimization(Jan)
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Allow psql to do \p\g(Bruce)
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Allow multiple rule actions(Jan)
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Added LIMIT/OFFSET functionality(Jan)
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Improve optimizer when joining a large number of tables(Bruce)
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New intro to SQL from S. Simkovics' Master's Thesis (Stefan, Thomas)
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New intro to backend processing from S. Simkovics' Master's Thesis (Stefan)
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Improved int8 support(Ryan Bradetich, Thomas, Tom)
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New routines to convert between int8 and text/varchar types(Thomas)
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New bushy plans, where meta-tables are joined(Bruce)
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Enable right-hand queries by default(Bruce)
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Allow reliable maximum number of backends to be set at configure time
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(--with-maxbackends and postmaster switch (-N backends))(Tom)
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GEQO default now 10 tables because of optimizer speedups(Tom)
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Allow NULL=Var for MS-SQL portability(Michael, Bruce)
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Modify contrib check_primary_key() so either "automatic" or "dependent"(Anand)
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Allow psql \d on a view show query(Ryan)
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Speedup for LIKE(Bruce)
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Ecpg fixes/features, see src/interfaces/ecpg/ChangeLog file(Michael)
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JDBC fixes/features, see src/interfaces/jdbc/CHANGELOG(Peter)
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Make % operator have precedence like /(Bruce)
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Add new postgres -O option to allow system table structure changes(Bruce)
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Update contrib/pginterface/findoidjoins script(Tom)
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Major speedup in vacuum of deleted rows with indexes(Vadim)
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Allow non-SQL functions to run different versions based on arguments(Tom)
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Add -E option that shows actual queries sent by \dt and friends(Masaaki Sakaida)
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Add version number in startup banners for psql(Masaaki Sakaida)
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New contrib/vacuumlo removes large objects not referenced(Peter)
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New initialization for table sizes so non-vacuumed tables perform better(Tom)
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Improve error messages when a connection is rejected(Tom)
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Support for arrays of char() and varchar() fields(Massimo)
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Overhaul of hash code to increase reliability and performance(Tom)
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Update to PyGreSQL 2.4(D'Arcy)
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Changed debug options so -d4 and -d5 produce different node displays(Jan)
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New pg_options: pretty_plan, pretty_parse, pretty_rewritten(Jan)
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Better optimization statistics for system table access(Tom)
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Better handling of non-default block sizes(Massimo)
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Improve GEQO optimizer memory consumption(Tom)
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UNION now suppports ORDER BY of columns not in target list(Jan)
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Major libpq++ improvements(Vince Vielhaber)
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Source Tree Changes
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-------------------
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Improve port matching(Tom)
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Portability fixes for SunOS
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Add NT/Win32 backend port and enable dynamic loading(Magnus and Daniel Horak)
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New port to Cobalt Qube(Mips) running Linux(Tatsuo)
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Port to NetBSD/m68k(Mr. Mutsuki Nakajima)
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Port to NetBSD/sun3(Mr. Mutsuki Nakajima)
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Port to NetBSD/macppc(Toshimi Aoki)
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Fix for tcl/tk configuration(Vince)
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Removed CURRENT keyword for rule queries(Jan)
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NT dynamic loading now works(Daniel Horak)
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Add ARM32 support(Andrew McMurry)
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Better support for HPUX 11 and Unixware
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Improve file handling to be more uniform, prevent file descriptor leak(Tom)
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New install commands for plpgsql(Jan)
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</programlisting>
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</Para>
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</sect2>
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</Sect1>
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<Sect1>
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<Title>Release 6.4.2</Title>
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