<!--
-$PostgreSQL: pgsql/doc/src/sgml/release.sgml,v 1.337 2005/08/23 01:22:53 momjian Exp $
+$PostgreSQL: pgsql/doc/src/sgml/release.sgml,v 1.338 2005/08/23 02:57:07 momjian Exp $
-->
<appendix id="release">
<title>Release Notes</title>
+ <sect1 id="release-8-1">
+ <title>Release 8.1</title>
+
+ <note>
+ <title>Release date</title>
+ <simpara>2005-1?-??, Current as of 2005-08-16</simpara>
+ </note>
+
+ <sect2>
+ <title>Overview</title>
+
+ <para>
+ Major changes in this release:
+
+ <variablelist>
+ <varlistentry>
+ <term>
+ </term>
+
+ <listitem>
+ <para>
+ </para>
+
+ </listitem>
+ </varlistentry>
+
+ </variablelist>
+ </para>
+ </sect2>
+
+ <sect2>
+ <title>Migration to version 8.0</title>
+
+ <para>
+ A dump/restore using <application>pg_dump</application> is
+ required for those wishing to migrate data from any previous
+ release.
+ </para>
+
+ <para>
+ The 8.0 release announced that the <function>to_char()</> function
+ for intervals would be removed in 8.1. However, since no better API has been
+ suggested, to_char(interval) has been enhanced in 8.1 and will remain in the
+ server.
+ </para>
+
+ <para>
+ Observe the following incompatibilities:
+
+ <itemizedlist>
+
+ <listitem>
+ <para>
+ Cause input of a zero-length string ('') for float4/float8/oid to throw
+ an error, rather than treat it as a zero (Neil)
+ </para>
+ <para>
+ This change is consistent with the current handling of zero-length
+ strings for integers. The schedule for this change was announced in 8.0.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ In psql, treat unquoted \{digit}+ sequences as octal (Bruce)
+ </para>
+ <para>
+ In previous releases, \{digit}+ sequences were treated as
+ decimal, and only \0{digit}+ were treated as octal. This
+ change was made for consistency.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Remove grammar productions for prefix and postfix % and ^ operators
+ (Tom)
+ </para>
+ <para>
+ These have never been documented and complicated the use of modulus
+ (%) with negative numbers.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Make "&<" and "&>" for polygons consistent with the box
+ "over" operators (Tom)
+ </para>
+ </listitem>
+
+ </itemizedlist>
+ </para>
+ </sect2>
+
+ <sect2>
+ <title>Changes</title>
+
+ <para>
+ Below you will find a detailed account of the changes between
+ release 8.1 and the previous major release.
+ </para>
+
+ <sect3>
+ <title>Performance Improvements</title>
+ <itemizedlist>
+
+ <listitem>
+ <para>
+ Improve rtree index capabilities and performance (Neil)
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Improve concurrent access to the shared buffer cache (Tom)
+ </para>
+ <para>
+ This was accomplished by eliminating global locks and using a clock
+ sweep algorithm to find free buffers.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Improve the optimizer, including auto-resizing of hash joins (Tom)
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Overhaul internal API in several areas to improve performance
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Allow indexes to be used for MIN/MAX (Tom)
+ </para>
+ <para>
+ In previous releases, the only way to use index for MIN/MAX was to rewrite
+ the query as SELECT col FROM tab ORDER BY col LIMIT 1. This not happens
+ automatically.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Add in-memory bitmaps which allows multiple indexes to be merged in a
+ single query (Tom)
+ </para>
+ <para>
+ Multiple AND and ORs
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Change WAL CRC records from 64bit to 32bit to improve performance
+ (Tom)
+ Prevent writing large empty gaps in WAL pages (Tom)
+ Allow non-consecutive index columns to be used in a multi-column index
+ (Tom)
+ </para>
+ <para>
+ For example, this allows an index on columns a,b,c to be used in a
+ query with WHERE a = 4 and c = 10
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Skip WAL logging for CREATE TABLE AS / SELECT INTO (Simon)
+ </para>
+ <para>
+ Since a crash during CREATE TABLE would cause the table to be dropped
+ during recovery, there is no reason to WAL log as the table is loaded.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Allow concurrent GIST index access, greatly improving performance
+ (Teodor)
+ Add GUC full_page_writes to control writing full pages to WAL (Bruce)
+ </para>
+ <para>
+ To prevent partial disk writes from corrupting the database,
+ PostgreSQL writes a complete copy of each database disk page to WAL
+ the first time it is modified after a checkpoint. This turns of that
+ functionality for users with battery-backed disk caches where partial
+ page writes can not happen.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Add constraint_exclusion to restrict child table lookups based on
+ table constraints (Simon)
+ </para>
+ <para>
+ This allows for a type of table partitioning. If child table placed
+ in a different tablespaces using appropriate CHECK constraints, the
+ optimizer will skip child table accesses if the constraint guarantees
+ no matching rows exist in the child table.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Use O_DIRECT if available when using O_SYNC for wal_sync_method (ITAGAKI
+ Takahiro)
+ </para>
+ <para>
+ O_DIRECT causes disk writes to bypass the kernel cache, and for WAL
+ writes, this improves performance.
+
+ Improve COPY FROM performance (Alon Goldshuv)
+ </para>
+ <para>
+ This was accomplished by reading COPY input in larger chunks, rather
+ than character by character.
+ </para>
+ </listitem>
+
+ </itemizedlist>
+ </sect3>
+
+
+ <sect3>
+ <title>Server Changes</title>
+ <itemizedlist>
+
+ <listitem>
+ <para>
+ Prevent problems due to transaction ID wraparound (Tom)
+ </para>
+ <para>
+ This was accomplished by warning the transaction counter is
+ near the the earliest transaction id determined by the
+ database whose last vacuum is the oldest. If the limit is
+ reached, the server will no longer accept queries.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Add warning about the need to increase "max_fsm_relations" and
+ "max_fsm_pages" during VACUUM (Ron Mayer)
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Add temp_buffers GUC variable to allow users to determine the size
+ of the local buffer area for temporary table access (Tom)
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Add session start time and client IP address to pg_stat_activity (Magnus)
+ Enhance pg_locks display (Tom)
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Log queries for client-side PREPARE and EXECUTE (Simon)
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Allow Kerberos name and user name case sensitivity to be specified from
+ postgresql.conf
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Add log_line_prefix options for millisecond timestamps (%m) and
+ remote host (%h) (Ed L.)
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Add WAL logging for GIST indexes (Teodor)
+ </para>
+ <para>
+ GIST indexes now work for online backup and crash recovery
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Add GUC krb_server_hostname so the server hostname can be specified as
+ part of service principal (Todd Kover)
+ </para>
+ <para>
+ If not set, any service principal matching an entry in the keytab
+ can be used. This is new Kerberos matching behavior in this release.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Remove old *.backup files when we do pg_stop_backup() (Bruce)
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ This prevents a large number of *.backup files from existing in
+ pg_xlog/.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Replace pg_shadow and pg_group by new role-capable catalogs pg_authid
+ and pg_auth_members.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Add SET ROLE (Stephen Frost)
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Move /contrib/pgautovacuum into the main server (Alvaro Herrera)
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Add GUC variables to control keep-alive times for idle, interval, and
+ count (Oliver Jowett)
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Add per-user and per-database connection limits (Petr Jelinek)
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Fix problem of OID wraparound conflicting with existing system objects
+ (Tom)
+ </para>
+ </listitem>
+
+ </itemizedlist>
+ </sect3>
+
+
+ <sect3>
+ <title>Query Changes</title>
+ <itemizedlist>
+
+ <listitem>
+ <para>
+ Add temporary views (Koju Iijima)
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Fix HAVING without aggregate functions and no GROUP BY to behave
+ as if the main query returns a single group (Tom)
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Add USING clause to allow additional tables to be specified to DELETE
+ (Euler Taveira de Oliveira)
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Change add_missing_from to 'false'
+ </para>
+ <para>
+ Generate an error if a table used in a query without a FROM reference (Neil)
+ No more SELECT pg_class.*;
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Add support for \x hex escapes in backend and ecpg strings (Bruce)
+ </para>
+ <para>
+ This supports the typical C standard \x escape. Octal was already
+ supported.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Add shared row level locks using SELECT ... FOR SHARE (Alvaro)
+ </para>
+ <para>
+ While PostgreSQL's MVCC locking allows SELECT to never be blocked by writers
+ and therefore does not need shared row locks for typical operations,
+ shared locks are useful for applications that require shared row locking,
+ and to reduce the locking requirements to maintain referential integrity.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Add BETWEEN SYMMETRIC query syntax (Pavel Stehule)
+ </para>
+ <para>
+ This feature allows BETWEEN comparisons without requiring the first
+ value to be less than the second. For example, 2 BETWEEN [ASYMMETRIC] 3 AND 1
+ returns false, while 2 BETWEEN SYMMETRIC 3 AND 1 returns true. BETWEEN
+ ASYMMETRIC was already supported.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Add E'' syntax so eventually normal strings can treat backslashes
+ literally (Bruce)
+ </para>
+ <para>
+ Currently PostgreSQL considers a backslash to be a special character
+ so the character after the backslash is treated specially. While this
+ allows easy entry of special values, it is non-standard and makes
+ porting of application from other databases more difficult. For this
+ reason, the PostgreSQL project is moving to remove the special meaning
+ of backslashes in strings, and allow only an E preceeding a string to
+ turn on the special handling of backslashes. For this reason, this
+ release adds several new GUC variables related to backslash
+ processing:
+
+ escape_string_warning - warn about backslashes in non-E strings
+ escape_string_syntax - does this release support the E'' syntax?
+ standard_conforming_strings - does this release treat backslashes
+ literally in non-E strings
+ </para>
+ <para>
+ The last two values are read-only and should assist in the porting of
+ applications. Applications can retrieve these values to know how
+ backslashes are processed. In a later release,
+ standard_conforming_strings will be true, meaning backslashes will be
+ treated literally in non-E strings. To prepare for this change, use
+ E'' strings in places that need special backslash processing, and turn
+ on escape_string_warning to find additional strings that need to be
+ converted to use E''.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Add NOWAIT option to SELECT ... FOR UPDATE/SHARE (Hans-Juergen Schoenig)
+ </para>
+ <para>
+ While SET statement_timeout allows a query taking over a certain
+ amount of time to be cancelled, the NO WAIT option allows a query to
+ be canceled as soon as a SELECT ... FOR UPDATE/SHARE can not
+ immediately acquire a row lock.
+ </para>
+ </listitem>
+
+ </itemizedlist>
+ </sect3>
+
+
+ <sect3>
+ <title>Object Manipulation Changes</title>
+ <itemizedlist>
+
+ <listitem>
+ <para>
+ Make default_with_oids default to false (Neil)
+ </para>
+ <para>
+ With this option set to false, user-created tables no
+ have an the usually-invisible OID column unless WITH OIDS
+ is specified in CREATE TABLE. Though OIDs have existed in all previous
+ releases of PostgreSQL, their use is limited because they are only four
+ bytes long and the counter is unique across all installed databases.
+ The preferred way of uniquely identifying rows is via sequences and
+ SERIAL, which has been supported since PostgreSQL 6.4.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Track dependencies of shared objects (Alvaro)
+ </para>
+ <para>
+ PostgreSQL allows global tables (users, databases, tablespaces) to
+ reference information in multiple databases. This addition adds
+ dependency information for global tables, so, for example, user
+ ownership can be tracked across databases, so a user who owns
+ something in any database can no longer be removed. Dependency
+ tracking already existed for database-local objects.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Allow ALTER OWNER commands to be performed by the object owner as
+ well as the superuser (Stephen Frost)
+ </para>
+ <para>
+ Prior releases only allowed super-user to change object owners, even
+ if the current owner was executing the command and the new owner
+ have permission to create objects of that type.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Add ALTER object SET SCHEMA capability for some object types
+ (tables, functions, types) (Bernd Helmle)
+ </para>
+ <para>
+ This allows objects to be moved to different schemas.
+ </para>
+ </listitem>
+
+ </itemizedlist>
+ </sect3>
+
+
+ <sect3>
+ <title>Utility Command Changes</title>
+ <itemizedlist>
+
+ <listitem>
+ <para>
+ Allow TRUNCATE to truncate multiple files in a single command (Alvaro)
+ </para>
+ <para>
+ Because of referential integrity checks, it is impossible to truncate
+ a table that is part of a referential integrity constraint. Using this
+ new functionality, TRUNCATE can be used to truncate all tables
+ involved in referential integrity if they are truncated in a
+ single TRUNCATE command.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Properly process carriage returns and line feeds in COPY CSV mode
+ (Andrew Dunstan)
+ </para>
+ <para>
+ In release 8.0, carriage returns and line feeds in CSV COPY TO were
+ not processed in a inconsitent manner. (This was documented on the TODO
+ list.)
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+
+ Add COPY WITH CSV HEADER to allow a heading line as the first line in
+ COPY (Andrew)
+ </para>
+ <para>
+ This allows handling of the common CSV usage of placing the column
+ names on the first line of the data file. For COPY TO, the first line
+ contains the column names, and for COPY FROM, the first line is
+ ignored.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ On Win32, display better sub-second precision in EXPLAIN ANALYZE (Magnus)
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Add trigger duration display to EXPLAIN ANALYZE (Tom)
+ </para>
+ <para>
+ Prior releases lumped trigger execution time into the total execution
+ time.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Add support for \x hex escapes in COPY (Sergey Ten)
+ </para>
+ <para>
+ Previous releases only supported octal escapes.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Have SHOW ALL include variable descriptions (Matthias Schmidt)
+ </para>
+ <para>
+ SHOW varname still only displays the variable's value and does not
+ include the description.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Add two-phase commit (Heikki Linnakangas, Alvaro, Tom)
+
+ Two-phase commit allows transactions to be "prepared" on several
+ computers, and once all computers have successfully prepared their
+ transactions (and can not be rolled back) all transactions can be
+ committed. Even if a machine crashes after a prepare, the prepared
+ transaction can be committed after it is restarted. New syntax
+ includes PREPARE TRANSACTION and COMMIT/ROLLBACK PREPARED. A new
+ system view pg_prepared_xacts has also been added.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Have initdb create new standard database called "postgres" and convert utilities
+ to use "postgres" rather than "template1" for standard lookups (Dave)
+ </para>
+ <para>
+ In prior releases, template1 was used both as a default connection for
+ things like createuser, and as a template for new databases. This
+ caused CREATE DATABASE to sometimes fail because a new database can
+ not be created if anyone else is in the template database. With this
+ change, the default connection database is now 'postgres', meaning is
+ is much less likely someone will be using template1 during CREATE
+ DATABASE.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Make REINDEX DATABASE reindex all indexes in the database (Tom)
+ </para>
+ <para>
+ The old behavior of REINDEX database reindexed only system tables.
+ This new behavior seems more intuitive. A new command REINDEX SYSTEM
+ allows for reindexing just the system tables.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Create new reindexdb command-line utility by moving /contrib/reindexdb
+ into the server (Euler Taveira de Oliveira)
+ </para>
+ </listitem>
+
+ </itemizedlist>
+ </sect3>
+
+
+ <sect3>
+ <title>Data Type and Function Changes</title>
+ <itemizedlist>
+
+ <listitem>
+ <para>
+ Add MAX() and MIN() aggregates for array types (Koju Iijima)
+ </para>
+ <para>
+ How does this work?
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Fix to_date() and to_timestamp() to behave reasonably when
+ CC and YY fields are both used (Karel Zak)
+ </para>
+ <para>
+ If the format specification contains CC and a year specification is
+ YYY or longer, ignore the CC. If the year specification is
+ YY or shorter, interpret CC as the previous century. ?
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Add md5(bytea) (Abhijit Menon-Sen)
+ </para>
+ <para>
+ md5(text) already existed.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Fix CHAR() to properly pad out to the specified length when
+ using a multiple-byte character set (Yoshiyuki Asaba)
+ </para>
+ <para>
+ In prior releases, the padding of CHAR() was incorrect because it only
+ padded to the specified number of bytes without considering how many
+ characters were stored.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Add support for NUMERIC ^ NUMERIC based on power(numeric, numeric)
+ </para>
+ <para>
+ The function already existed, but there was no operator assigned to
+ it.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Fix NUMERIC modulus by properly truncating the quotient during
+ computation (Bruce)
+ </para>
+ <para>
+ In previous releases, modulus for large values sometimes returned
+ negative results due to the rounding of the quotient.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Add a function lastval(), which returns the value returned by the
+ last nextval() or setval() performed by the current session. (Dennis
+ Björklund)
+ </para>
+ <para>
+ lastval() is a simplified version of currval(). It automatically
+ determines the proper sequence name based on the most recent
+ nextval() call.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Add to_timestamp(double precision)
+ </para>
+ <para>
+ Converts Unix seconds since 1970 to a timestamp with timezone.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Add pg_postmaster_start_time() function (Euler Taveira de Oliveira,
+ Matthias Schmidt)
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Allow the full use of time zone names in "AT TIME ZONE", not just
+ the short list previously available (Magnus)
+ </para>
+ <para>
+ Previously, only a predefined list of time zone names were supported
+ by AT TIME ZONE. Now any supported time zone name can be used, e.g.:
+ </para>
+ <para>
+ SELECT CURRENT_TIMESTAMP AT TIME ZONE 'Europe/London';
+
+ In the above query, the daylight savings time rules were in effect on
+ that date are used.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+
+ Add Oracle-compatible GREATEST and LEAST functions (Pavel Stehule)
+ </para>
+ <para>
+ These functions take a variable number of arguments and return the
+ greatest or least value.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Add pg_column_size() to return storage size of a column, including
+ possible compression (Mark Kirkwood)
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Add regexp_replace() (Atsushi Ogawa)
+ </para>
+ <para>
+ This allows regular expression replacement, like sed. A four-argument
+ version also allows for global (replace all) and case-insensitive
+ modes.
+
+ Fix interval division and multiplication (Bruce)
+ </para>
+ <para>
+ Previous versions sometimes returned unjustified results, like
+ '4 months'::interval / 5 returning '1 mon -6 days'.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Add internal 'day' field to INTERVAL so a 1 day interval can be
+ distinguished from a 24 hour interval (Michael Glaesemann)
+ </para>
+ <para>
+ Days that contain a daylight savings time adjustment are not 24 hours,
+ but typically 23 or 25 hours. This change allows days (not fixed
+ 24-hour periods) to be added to dates who's result includes a daylight
+ savings time adjustment period. Therefore, while in previous releases
+ '1 day' and '24 hours' where interchangeable interval periods, in this
+ release they are treated differently, e.g.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ '2005-05-03 00:00:00 EST' + '1 day' = '2005-05-04 00:00:00-04'
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ '2005-05-03 00:00:00 EST' + '24 hours' = '2005-05-04 01:00:00-04'
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Move /contrib/dbsize into the backend, and rename some of the functions
+ (Dave Page)
+ </para>
+ <para>
+ The new functions are:
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ pg_tablespace_size()
+ pg_database_size()
+ pg_relation_size()
+ pg_complete_relation_size()
+ pg_size_pretty()
+ </para>
+ <para>
+ complete_relation_size() includes indexes and TOAST tables.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Add justify_days() and justify_hours (Michael Glaesemann)
+ </para>
+ <para>
+ These functions, respectively, adjust days to an appropriate number of
+ full months and dayss, and adjust hours to an appropriate number
+ of full days and hours.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Add files to do read-only I/O on the cluster directory (Dave Page,
+ Andreas Pflug)
+
+ pg_stat_file()
+ pg_read_file()
+ pg_ls_dir()
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Add pg_reload_conf() to force reloading of the configuration files (Dave Page,
+ Andreas Pflug)
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Add pg_rotate_logfile() to force rotation of the server log file (Dave Page,
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Change pg_stat_* views to show TOAST tables (Tom)
+
+ </itemizedlist>
+ </sect3>
+
+
+ <sect3>
+ <title>Encoding and Locale Changes</title>
+ <itemizedlist>
+
+ <listitem>
+ <para>
+ Rename some encodings to be more consistent and to follow international
+ standards(Bruce)
+ </para>
+ <para>
+ Encoding name changes were:
+ UNICODE is now UTF8
+ ALT is now WIN866
+ WIN is now WIN1251
+ TCVN is now WIN1258
+ </para>
+ <para>
+ The original names still work.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Add support for Win1252 encoding (Roland Volkmann)
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Add support for 3 and 4-byte UTF8 characters (John Hansen)
+ </para>
+ <para>
+ Previously only one and two-byte UTF8 characters were supported.
+ This is particularly important for support for some Chinese character.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Allow direct conversion between EUC_JP and SJIS to improve performance (Atsushi
+ Ogawa)
+ </para>
+ </listitem>
+
+ </itemizedlist>
+ </sect3>
+
+
+ <sect3>
+ <title>General Server-Side Language Changes</title>
+ <itemizedlist>
+
+ <listitem>
+ <para>
+ Fix ALTER LANGUAGE RENAME (Sergey Yatskevich)
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Allow function characteristics, like strictness and volatility,
+ to be modified via ALTER FUNCTION (Neil)
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Increase the maximum number of function arguments to 100 (Tom)
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Allow SQL, plperl, PL/PgSQL functions to use OUT and INOUT parameters (Tom)
+ </para>
+ <para>
+ OUT is an alternate way for a function to return values. Instead of
+ using RETURNS, the function's parameters can be specified as OUT or
+ INOUT, allowing multiple values to be returned by the function. While
+ returning multiple values from a function was possible in previous
+ releases, this greatly simplifies the process.
+ </para>
+ </listitem>
+
+ </itemizedlist>
+ </sect3>
+
+ <sect3>
+ <title>PL/PgSQL Server-Side Language Changes</title>
+ <itemizedlist>
+
+ <listitem>
+ <para>
+ Reduce memory usage of PL/PgSQL functions (Neil)
+ </para>
+ <para>
+ Each function now has its own memory context that can be freed when
+ the function exits.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Check function syntax as CREATE FUNCTION time, rather than at runtime
+ (Neil)
+ </para>
+ <para>
+ Previously, syntax errors were reported only when the function was
+ executed.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Allow OPEN to open non-SELECT queries like EXPLAIN and SHOW (Tom)
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ No longer require functions to issue a RETURN statement (Tom)
+ </para>
+ <para>
+ This is a byproduct of the newly added OUT and INOUT functionality.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Add support for an optional INTO clause to PL/PgSQL's EXECUTE command
+ (Pavel Stehule)
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Make CREATE TABLE AS set ROW_COUNT (Tom)
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Define SQLSTATE and SQLERRM to return the SQLSTATE and
+ error message of the current exception (Pavel Stehule)
+ </para>
+ <para>
+ These variables are only accessable inside exception blocks.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Allow the parameters to the RAISE statement to be expressions
+ (Pavel Stehule)
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Add a loop CONTINUE statement (Pavel Stehule)
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Allow block and loop labels (Pavel Stehule)
+ </para>
+ </listitem>
+
+ </itemizedlist>
+ </sect3>
+
+
+ <sect3>
+ <title>PL/Perl Server-Side Language Changes</title>
+ <itemizedlist>
+
+ <listitem>
+ <para>
+ Allow the return large result sets (Abhijit Menon-Sen)
+ </para>
+ <para>
+ This allows PL/Perl to use spi_query(), spi_fetchrow(), and
+ return_next() to return one row at a time from the function.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Force PL/Perl to handle strings as UTF8 if the server encoding is UTF8
+ (David Kamholz)
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Add a validator function for PL/Perl (Andrew)
+ </para>
+ <para>
+ This allows syntax errors to be reported at definition time, rather
+ than execution time.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Allow PL/Perl to return a Perl array when the function returns an array
+ type (Andrew)
+ </para>
+ <para>
+ This basically maps PostgreSQL arrays to Perl arrays.
+ </para>
+ </listitem>
+
+ </itemizedlist>
+ </sect3>
+
+
+ <sect3>
+ <title><application>psql</> Changes</title>
+ <itemizedlist>
+
+ <listitem>
+ <para>
+ Add psql \set ON_ERROR_ROLLBACK to allow statements in a transaction to
+ error without affecting the rest of the transaction (Greg Sabino Mullane)
+ </para>
+ <para>
+ This is basically implemented by wrapping every statement in a subtransaction.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Add support for \x hex strings in psql variables (Bruce)
+ </para>
+ <para>
+ Octal escapes were already supported.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Add psql support for troff "-ms" output format (Roger Leigh)
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Allow psql's history file location to be controlled by HISTFILE (Andreas
+ Seltenreich)
+ </para>
+ <para>
+ This allows configuration of per-database history storage.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Prevent psql \x (expanded mode) from affecting other backslash output
+ (Neil)
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Add -L option to psql to log sessions (Lorne Sunley)
+ </para>
+ <para>
+ This option was added because some operating systems do not have
+ simple command-line activity logging functionality.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Have psql \d show tablespace of indexes (Qingqing Zhou)
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Allow psql \h to make a best guess on the proper help information (Greg
+ Sabino Mullane)
+ </para>
+ <para>
+ This allows the user to just add \h to the front of the syntax error
+ query and get help on the supported syntax. Previously any additional
+ query text beyond the help topics supported had to be removed to use
+ \h.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Add psql \pset numericlocale to allow numbers to be output in a
+ locale-aware format (Eugen Nedelcu)
+ </para>
+ <para>
+ For example, using C locale 100000 would be output as 100,000.0 and
+ European locale might output this value as 100.000,0.
+ </para>
+ </listitem>
+
+ </itemizedlist>
+ </sect3>
+
+
+ <sect3>
+ <title><application>pg_dump</> Changes</title>
+ <itemizedlist>
+
+ <listitem>
+ <para>
+ Add -n / --schema switch to pg_restore (Richard van den Bergg)
+ </para>
+ <para>
+ This allows only objects from a specified schema to be restored.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Allow pg_dump to dump a consistent snapshot of large objects (Tom)
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Allow pg_dump to dump large objects even in text mode (Tom)
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Dump comments for large objects (Tom)
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Add --encoding to pg_dump (Magnus Hagander)
+ </para>
+ <para>
+ This allows a database to be dumped in an encoding that is different
+ from the server's encoding. This is valuable when transferring the dump
+ to a machine with a different encoding.
+ </para>
+ </listitem>
+
+ </itemizedlist>
+ </sect3>
+
+
+ <sect3>
+ <title>libpq Changes</title>
+ <itemizedlist>
+
+ <listitem>
+ <para>
+ Add a "PGPASSFILE" environment variable to specify the password
+ file's filename (Andrew Dunstan)
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Add lo_create(), that is similar to lo_creat() but allows the OID of the large
+ object to be specified (Tom)
+ </para>
+ </listitem>
+
+ </itemizedlist>
+ </sect3>
+
+
+ <sect3>
+ <title>Source Code Changes</title>
+ <itemizedlist>
+
+ <listitem>
+ <para>
+ Add spinlock support for the Itanium processor using Intel compiler (Vikram
+ Kalsi)
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Add Kerberos 5 support for Win32 (Magnus)
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Add Chinese FAQ (laser@pgsqldb.com)
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Rename Rendezvous to Bonjour to match OS/X feature renaming (Bruce)
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Add support for wal_fsync_writethrough for Darwin (Chris Campbell)
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Streamline the passing information within the server, the optimizer,
+ and the lock system (Tom)
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Allow pg_config to be compiled using MSVC (Andrew Dunstan)
+ </para>
+ <para>
+ This is required to build DBD::Pg using MSVC.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Remove support for Kerberos V4 (Magnus)
+ </para>
+ <para>
+ Kerberos 4 had security vulnerabilities and is no longer being
+ maintained by the authors.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Code cleanups (Coverity static analysis performed by EnterpriseDB)
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Modify postgresql.conf to use documention defaults on/off rather
+ than true/false (Bruce)
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Enhance pg_config to be able to report more build-time values (Tom)
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Replace rtree index code with code from /contrib/rtree_gist (Tom)
+ </para>
+ <para>
+ The improved capabilities of GIST indexes made this possible.
+ </para>
+ </listitem>
+
+ </itemizedlist>
+ </sect3>
+
+
+ <sect3>
+ <title>Contrib Changes</title>
+ <itemizedlist>
+
+ <listitem>
+ <para>
+ Add /contrib/pg_buffercache contrib module (Mark Kirkwood)
+ </para>
+ <para>
+ This displays the contents of the buffer cache, for debugging and
+ performance tuning purposes.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Remove /contrib/array because it is obsolete (Tom)
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Cleanup the contrib/lo module (Tom)
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Move /contrib/findoidjoins to src/tools (Tom)
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Remove the <<, >>, &<, and &> operators for contrib/cube
+ </para>
+ <para>
+ These operators were not useful.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ Improve /contrib/btree_gist (Janko Richter)
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ /contrib/pgcrypto - Remove support for libmhash/libmcrypt (Marko Kreen)
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ /contrib/pgcrypto - Add support for new encryption methods (Marko Kreen)
+ </para>
+ <para>
+ 3des and AES
+ SHA2 (SHA256, SHA384, SHA512)
+ Fortuna PRNG
+ PGP encryption
+ RSA key
+ </para>
+ </listitem>
+
+ </itemizedlist>
+ </sect3>
+
+ </sect2>
+ </sect1>
+
<sect1 id="release-8-0-3">
<title>Release 8.0.3</title>
OSDN Git Service
