From 128b1c5022dd6299a56d9cf356a6368d1aeea885 Mon Sep 17 00:00:00 2001 From: Bruce Momjian Date: Sat, 20 Mar 2010 03:30:12 +0000 Subject: [PATCH] Create 9.0 release notes; keep 9.0-alpha release notes in place. --- doc/src/sgml/release-9.0.sgml | 2418 ++++++++++++++++++++++++++++++++- 1 file changed, 2416 insertions(+), 2 deletions(-) diff --git a/doc/src/sgml/release-9.0.sgml b/doc/src/sgml/release-9.0.sgml index cb07f37fef..71bae0d496 100644 --- a/doc/src/sgml/release-9.0.sgml +++ b/doc/src/sgml/release-9.0.sgml @@ -1,6 +1,2420 @@ - + - + + + Release 9.0 + + + Release date + 2010-??-?? + + + + Overview + + + ADD HERE + + + + + + The above items are explained in more detail in the sections below. + + + + + + + Migration to Version 9.0 + CURRENT AS OF 2010-03-15 + + + A dump/restore using pg_dump is + required for those wishing to migrate data from any previous + release. + + + + Observe the following incompatibilities: + + + + Server Settings + + + + + + Remove server variable add_missing_from, which was + defaulted to off for many years (Tom) + + + + + + Remove server variable regex_flavor, which was defaulted + to advanced (e.g. Perl-regex compatible) for many + years (Tom) + + + + + + + + + Queries + + + + + When querying a parent table, do not do additional permission + checks on child tables returned as part of the query (Peter) + + + + The SQL standard specifies this behavior. + + + + + + Have fractional seconds truncate rather than round when using + float-based dates/times (Tom) + + + + + + + + + String Handling + + + + + Fix SIMILAR TO to match the SQL standard-specified behavior + by processing ? and {} the same way they are + processed in regular expressions (Tom) + + + + + + Properly treat ^ and $ as literals in + SIMILAR TO patterns, to match the SQL standard (Tom) + + + + Previously these were treated using regular expression syntax. This + change breaks backward compatibility. This also affects + substring()'s interpretation of regular expressions. + + + + + + Process parentheses as literals in SIMILAR TO expressions; + also make character class handling more standards-compliant (Tom) + + + + This also affects substring()'s handling of regular + expressions. + + + + + + Do not allow substring() to have a negative third + length, per the SQL standard (Tom) + + + + + + + + + Object Renaming + + + + + Tighten enforcement of column renaming when a child table inherits + the renamed column from an unrelated parent (KaiGai Kohei) + + + + + + No longer rename index names and index column names when table + columns are renamed (Tom) + + + + Administrators still can rename such columns manually. Expression + index names are also not renamed. WHY ARE EXPRESSION INDEXES + SIGNIFICANT? + + + + + + + + + + PL/pgSQL Variables + + + + + + Have PL/pgSQL throw an error if a variable name conflicts with a + column name used in a query (Tom) + + + + This behavior can be changed via the server variable + plpgsql.variable_conflict, or by the per-function option + #variable_conflict. The former behavior was to bind to + variable names over column names. + + + + + + Remove PL/pgSQL's RENAME declaration option (Tom) + + + + Instead, use ALIAS, which can now alias any variable, + not just dollar sign variables, e.g. $1. + + + + + + PL/pgSQL no longer allows unquoted variables names that match SQL + reserved words (Tom) + + + + Variables can be double-quoted to avoid this restriction. + + + + + + + + + Changes + + + Server + + + Continuous Archiving + + + + + Allow continuous archive standby systems to accept read-only queries + (Simon, Heikki) + + + + This feature is called Hot Standby. There are new + postgresql.conf and recovery.conf settings + to enable this feature, as well as extensive documentation. + + + + + + Allow continuous archive (WAL) files to be streamed to a + standby system (Fujii Masao, Heikki) + + + + Previously WAL files could be sent to standby systems only + as 16 megabytes files; this allows master changes to be sent to the + slave with very little delay. There are new postgresql.conf + and recovery.conf settings to enable this feature, as + well as extensive documentation. + + + + + + Add pg_last_xlog_receive_location() and + pg_last_xlog_replay_location(), which can be used to + monitor standby server WAL activity (Fujii Masao, + Heikki) + + + + + + + + + Performance + + + + + Improve performance of finding inherited child tables (Tom) + + + + + + Allow per-tablespace sequential and random page cost variables + (seq_page_cost/(random_page_cost)) via + ALTER TABLESPACE + ... SET/RESET (Robert Haas) + + + + + + Improve performance of TRUNCATE when used in the same + transaction as table creation (Tom) + + + + + + + + + Optimizer + + + + + Allow IS NOT NULL restrictions to use indexes (Tom) + + + + This is particularly useful for finding + MAX()/MIN() values in indexes that also + contain NULLs. + + + + + + Remove unnecessary outer joins (Robert Haas) + + + + Outer joins where the inner side is unique and not referenced in + the query are unnecessary and are therefore now removed. + + + + + + Improve optimizer equivalence detection of <> boolean + tests (Tom) + + + + + + + GEQO + + + + + Use the same random seed everytime GEQO plans a query (Andres + Freund) + + + + While the Genetic Query Optimizer (GEQO) still selects random plans, + it now selects the same random plans for identical queries. You + can modify geqo_seed to randomize the starting value + of the random plan generator. + + + + + + Improve GEQO plan selection (Tom). + + + + This avoids the rare error, "failed to make a valid plan". + + + + + + + + + Optimizer Statistics + + + + + Improve ANALYZE to support inheritance-tree statistics + (Tom) + + + + This is particularly useful for partitioned tables. + + + + + + Improve autovacuum detection of when re-analyze is necessary (Tom) + + + + + + Improve optimizer statistics for greater/less-than comparisons + (Tom) + + + + When looking up optimizer statistics for greater/less-than comparisons, + if the comparison value is in the first or last histogram bucket, + use an index to generate the actual statistics. This is particularly + useful for columns that are always increasing, and hence often have + inaccurate statistics. + + + + + + Allow setting of distinct statistics using ALTER TABLE + (Robert Haas) + + + + This allows user-override of the number or percentage of distinct + values for a column and optionally its child tables. This value + is normally computed by ANALYZE. + + + + + + + + + Authentication + + + + + Add support for RADIUS (Remote Authentication Dial In + User Service) authentication (Magnus) + + + + + + + Allow LDAP (Lightweight Directory Access Protocol) + authentication to operate in "search/bind" mode (Robert Fleming, + Magnus) + + + + This allows the user to be looked up first, then the system uses + the DN (Distinguished Name) returned for that user. + + + + + + Add samehost and samenet designations to + pg_hba.conf (Stef Walter) + + + + These match the server's IP address and network address + respectively. + + + + + + + + + Monitoring + + + + + Add the ability for clients to set an application name, which is + displayed in pg_stat_activity (Dave Page) + + + + + + Add an SQL state option (%e) to log_line_prefix + (Guillaume Smet) + + + + + + Write to the Windows event log in UTF16 encoding + (Itagaki Takahiro) + + + + + + + + + Statistics Counters + + + + + Add pg_stat_reset_shared('bgwriter') to reset the + cluster-wide shared statistics of the bgwriter (Greg Smith) + + + + + + Add pg_stat_reset_single_table_counters() and + pg_stat_reset_single_function_counters() to allow the + reseting of statistics counters for individual tables and indexes + (Magnus) + + + + + + + + + Server Settings + + + + + Allow setting of configuration variables based on database/role + combinations (Alvaro) + + + + Previously only per-database and per-role setting were possible, + not combinations. All role and database settings are now stored + in the new pg_db_role_setting system table. A new + psql \drds command shows these settings. + Backwards-compatible system views do not show this information. + + + + + + Add boolean variable bonjour, which controls whether + a Bonjour-enabled binary advertises itself via Bonjour + (Tom) + + + + The default is off, meaning it does not advertise. + + + + + + Log changed parameter values when postgresql.conf is + reloaded (Peter) + + + + + + + + + + + Queries + + + + + Do SELECT FOR UPDATE/SHARE processing + after applying LIMIT, so the number of rows returned + is always predictable (Tom) + + + + Previously, concurrent transactions could potentially cause + SELECT to return fewer rows than specified by + LIMIT. FOR UPDATE can still affect + ORDER BY ordering, but this can be corrected by using + FOR UPDATE in a subquery. + + + + + + Allow mixing of traditional and SQL-standard + LIMIT/OFFSET syntax in the same query (Tom) + + + + + + Increase the supported frame options in window functions (Hitoshi + Harada) + + + + This allows frames (RANGE or ROWS) to start + with CURRENT ROW, and to use the ROWS n + PRECEDING/FOLLOWING clause. + + + + + + + + Unicode Strings + + + + + Add Unicode surrogate pair (dual 16-bit) support to U& + strings and identifiers (Peter) + + + + + + Allow Unicode escapes in E'...' strings (Marko Kreen) + + + + + + + + + + + + Object Manipulation + + + + + Speed up CREATE DATABASE by deferring flushes to disk + (Andres Freund, Greg Stark) + + + + + + Allow comments only on columns of tables, views, and composite + types, not other objects like indexes and TOAST tables + (Tom) + + + + + + Allow the creation of enumerate types with no labels (Bruce) + + + + This is useful for supporting binary upgrades. + + + + + + Have columns defined with storage type MAIN remain on + main heap page unless it cannot fit (Kevin Grittner) + + + + Previously MAIN values were forced to TOAST + tables until the row size was one-quarter of the page size. + + + + + + + <command>ALTER</> + + + + + Add ALTER DEFAULT PRIVILEGES command to control privileges of + all newly-created objects (Petr Jelinek) + + + + It currently supports tables, views, sequences, and functions, and + also has per-schema control. + + + + + + Implement IF EXISTS for DROP COLUMN and + DROP CONSTRAINT (Andres Freund) + + + + + + Allow ALTER TABLE commands which rewrite tables to skip + WAL logging (Itagaki Takahiro) + + + + Such operations either complete fully or are rolled back, so + WAL archiving can be skipped, unless running in continuous + archiving mode. + + + + + + + + + <command>CREATE TABLE</> + + + + + Add support for copying COMMENTS and STORAGE + to the CREATE TABLE ... LIKE INCLUDING command (Itagaki + Takahiro) + + + + + + Add support for copying all attributes to the CREATE + TABLE LIKE INCLUDING command (Itagaki Takahiro) + + + + + + Add the SQL-standard CREATE TABLE ... OF type command + (Peter) + + + + This allows the creation of a table to match an existing composite + type. Additional constraints and defaults can be specified in the + command. + + + + + + Have SELECT and CREATE TABLE AS return + row counts to the client + (Boszormenyi Zoltan) + + + + psql does not display these counts. + + + + + + + + + Constraints + + + + + Add deferrable unique constraints (Dean Rasheed) + + + + This allows UPDATE tab SET col = col + 1 to work on + columns that have a unique indexes or are marked as primary keys, + but DEFERRABLE INITIALLY DEFERRED must be used to mark + the constraint as deferred. + + + + + + Generalize uniqueness constraints by allowing arbitrary operator + comparisons, not just equality (Jeff Davis) + + + + This is enabled with the CREATE TABLE CONSTRAINT ... + EXCLUDE clause. While uniqueness checks could be specified + using this syntax, the real value of this features is in using + complex operators that do not have built-in constraints. + + + + + + Improve the constraint violation error message to report the values + causing the failure (Itagaki Takahiro) + + + + For example, a uniqueness constraint violation now reports Key + (x)=(2) already exists. + + + + + + + + + Object Permissions + + + + + Add the ability to make mass permission changes per schema using + the new GRANT/REVOKE IN SCHEMA clause + (Petr Jelinek) + + + + + + Add the ability to control large object permissions with + GRANT/REVOKE (KaiGai Kohei) + + + + + + + + + + + Utility Operations + + + + + + Have LISTEN/NOTIFY store events in a memory + queue, rather than a system table (Joachim Wieland) + + + + This greatly improves performance for these operations. + + + + + + Allow NOTIFY to pass an optional string to listeners + (Joachim Wieland) + + + + + + Allow CLUSTER on all system tables (Tom) + + + + Global system tables still cannot be clustered. + + + + + + + <command>COPY</> + + + + + Allow * as a parameter in FORCE QUOTE for + COPY CSV (Itagaki Takahiro) + + + + This forces quotes for all CSV output columns. + + + + + + Add new COPY syntax that allows parameters to be + specified in parentheses (Robert Haas, Emmanuel Cecchet) + + + + This allows greater flexibility for future COPY options. + The old syntax is still supported. + + + + + + + + + <command>EXPLAIN</> + + + + + Add new EXPLAIN (BUFFERS) to report query buffer + activity (Itagaki Takahiro) + + + + log_*_stats log output, e.g. log_statement_stats, no + longer shows this information. + + + + + + Add hash usage information to EXPLAIN output (Robert + Haas) + + + + + + Allow EXPLAIN output in XML, JSON, + and YAML formats (Robert Haas, Greg Sabino Mullane) + + + + + + Allow EXPLAIN options to be specified inside parentheses + (Robert Haas) + + + + This allows for the expansion of EXPLAIN options. The + old syntax is still supported. + + + + + + + + + <command>VACUUM</> + + + + + Change VACUUM FULL to rewrite the entire table and + indexes, rather than moving around single rows to compact space + (Itagaki Takahiro, Tom) + + + + The previous method was usually slower and caused index bloat. + + + + + + Add new VACUUM syntax that allows parameters to be + specified in parentheses (Itagaki Takahiro) + + + + This allows greater flexibility for future VACUUM + options. The old syntax is still supported. + + + + + + + + + Indexes + + + + + Allow an index to be auto-named by not supplying an index name to + CREATE INDEX (Tom) + + + + + + Allow REINDEX on system indexes (Tom) + + + + WAS THIS POSSIBLE ON ANY SYSTEM TABLE BEFORE? NON-HARDWIRED ONES? + + + + + + Add point_ops opclass for GiST (Teodor) + + + + DETAILS? + + + + + + Use red-black trees for GIN index creation (Teodor) + + + + Red-black trees are self-balanced so allow for faster index + creation. + + + + + + + + + + + Data Types + + + + + Allow hex values to be specified in bytea strings (Peter) + + + + The variable bytea_output controls if hex (default) + or octal escapes are used for bytea output. (SWITCH + DEFAULT FOR BETA? PETER) Libpq's PQescapeByteaConn() + now uses the hex format for PostgreSQL 9.0 servers. + + + + + + Allow extra_float_digits to be increased to 3 + (Tom) + + + + The previous maximum extra_float_digits was 2. + + + + + + + Full Text Search + + + + + Add prefix support for the full text search synonym dictionary + (Teodor) + + + + + + Add full text search filtering dictionaries (Teodor) + + + + Filtering dictionaries allow tokens to be modified and passed to + subsequent dictionaries. + + + + + + Allow underscores in full text email addresses (Teodor) + + + + + + + + + + + Functions + + + + + Allow case-insensitive regular expression matching with UTF-8 + server encodings. + + + + Previously, only ASCII characters and single-byte + encodings worked properly. Other multi-byte, non-UTF-8 + encodings are still broken for case-insensitive regular expression + matching. + + + + + + Allow function calls to supply parameter names and match them to named + parameters in the function definition (Pavel Stehule) + + + + For example, if a function is defined to take parameters a + and b, it can be called with func(7 AS a, 12 + AS b) or func(12 AS b, 7 AS a). + + + + + + Add support for to_char() scientific notation output + ('EEEE') (Pavel Stehule, Brendan Jurd) + + + + + + Have to_char() honor 'FM' (fill mode) in + 'Y', 'YY', and 'YYY' specifications + (Bruce) + + + + It was already honored by 'YYYY'. + + + + + + Correct calculations of "overlap" and "contains" operations over + polygons (Teodor) + + + + + + + Aggregates + + + + + Allow aggregate functions to use ORDER BY (Andrew + Gierth) + + + + For example, this is now supported, array_agg(a ORDER BY + b). This is useful for aggregates where the order of values is + significant. + + + + + + Add the string_agg() aggregate function which aggregates + values into a single string (Pavel Stehule) + + + + An optional second argument allows specification of a delimiter. + + + + + + Aggregate functions that are called with DISTINCT are + now passed NULL values if the aggregate transition function is + not marked as STRICT (Andrew Gierth) + + + + For example, agg(DISTINCT x) might pass NULL x + values to agg(). + + + + + + + + + Bit Strings + + + + + Add get_bit() and set_bit() functions + for bit strings, mirroring those for bytea + (Leonardo F) + + + + + + Implement OVERLAY() (replace) for bit strings + and bytea (Leonardo F) + + + + + + + + + Object Information Functions + + + + + Add pg_table_size() and pg_indexes_size() + to provide a more user-friendly interface to the + pg_relation_size() function (Bernd Helmle) + + + + + + Add has_sequence_privilege() for sequence permission + checking (Abhijit Menon-Sen) + + + + + + Have information schema properly display date type octet lengths + (Peter) + + + + The reported length is now the maximum octet length; previously, + a huge value was reported. + + + + + + Speed up information schema privilege views (Joachim Wieland) + + + + + + + + + Function and Trigger Creation + + + + + Implement anonymous functions using the DO statement + (Petr Jelinek, Joshua Tolley, Hannu Valtonen) + + + + This allows execution of server-side code without the need to create + a new function and execute it. + + + + + + Allow SQL-compliant per-column triggers (Itagaki Takahiro) + + + + Such triggers are fired only if the specified columns are affected + by the query, e.g. in UPDATE's SET list. + information_schema now also shows this information. + + + + + + Add WHERE clause to CREATE TRIGGER to + allow control over whether a trigger is fired (Takahiro Itagaki) + + + + While a check can be performed inside the trigger, doing it in an + external WHERE clause has performance benefits. + + + + + + + + + Server-Side Languages + + + + + + Add the OR REPLACE clause to CREATE + LANGUAGE (Tom) + + + + This is helpful to optionally install a language if it does not + already exist, and is particularly helpful now that PL/pgSQL is + installed by default. + + + + + + + PL/PgSQL Server-Side Language + + + + + + Install server-side language PL/pgSQL by default (Bruce) + + + + + + Allow PL/pgSQL to handle row types with dropped columns (Pavel Stehule) + + + + + + Allow IN parameters to be assigned values within + PL/pgSQL functions (Steve Prentice) + + + + + + Improve error location reporting in PL/pgSQL (Tom) + + + + + + Have PL/pgSQL use the main lexer, rather than a custom version (Tom) + + + + + + + + + PL/pgSQL Cursors + + + + + Add count and ALL options to MOVE + FORWARD/BACKWARD in PL/pgSQL (Pavel Stehule) + + + + + + Allow PL/pgSQL's WHERE CURRENT OF to use a cursor + variable (Tom) + + + + + + Add PL/pgSQL's OPEN cursor FOR EXECUTE to use parameters + (Pavel Stehule, Itagaki Takahiro) + + + + This is accomplished with a new USING clause. + + + + + + + + + PL/Perl Server-Side Language + + + + + Add new PL/Perl functions: quote_literal(), + quote_nullable(), quote_ident(), + encode_bytea(), decode_bytea(), + looks_like_number(), encode_array_literal(), + encode_array_constructor() (Tim Bunce) + + + + + + Add server variable plperl.on_init to specify a PL/Perl + Perl initialization function (Tim Bunce) + + + + plperl.on_plperl_init and plperl.on_plperlu_init + are also available for trusted/untrusted-specific initialization. + + + + + + Improve error context support in PL/Perl (Alexey Klyukin) + + + + + + Support END blocks in PL/Perl (Tim Bunce) + + + + END blocks do not currently allow database access. + + + + + + Allow use strict in PL/Perl (Tim Bunce) + + + + + + Allow require in PL/Perl (Tim Bunce) + + + + This basically tests to see if the module is loaded, and if not, + generates an error. + + + + + + Allow use feature in PL/Perl if Perl version 5.10 or + later is used (Tim Bunce) + + + + + + Verify that PL/Perl return values are valid in the server encoding + (Andrew) + + + + + + Improve PL/Perl code structure (Tim Bunce) + + + + + + PL/Perl subroutines are now given names (Tim Bunce) + + + + This is for the use of profiling and code coverage tools. DIDN'T + THEY HAVE NAMES BEFORE? + + + + + + PL/Perl no longer allows Safe version 2.20 because + it is unsafe (Tim Bunce) + + + + + + + + + PL/Python Server-Side Language + + + + + Add Unicode support in PL/Python (Peter) + + + + Strings are automatically converted from/to the server encoding as + necessary. + + + + + + Improve bytea support in PL/Python (Caleb Welton) + + + + Bytea values passed into PL/Python now are represented as + binary, rather than the Postgres bytea text format. Null + bytes are now also output properly from PL/Python. Boolean + and numeric value passing in PL/Python was also improved. + + + + + + Add array parameter/return support to PL/Python (Peter) + + + + + + Improve mapping of domains to Python base types in PL/Python (Peter) + + + + + + Add Python 3 support to PL/Python (Peter) + + + + The new server-side language is called plpython3u. + + + + + + Improve error location and exception reporting in PL/Python (Peter) + + + + + + + + + + + + + Client Applications + + + + + Add vacuumdb + + + + + + <application>psql</> + + + + + Properly escape psql variables and identifiers + (Pavel Stehule, Robert Haas) + + + + For example, :'var' will be escaped as a literal string, and + :"var" will be escaped as an SQL identifier. + + + + + + Ignore leading UTF-8-encoded Unicode byte-order marker in + psql (Itagaki Takahiro) + + + + This is enabled when the client encoding is UTF-8. + + + + + + Fix psql --file - to properly honor + + + + + + Prevent overwriting of psql's command-line history + if two psql sessions are run simultaneously (Tom) + + + + + + Improve psql's tab completion support (Itagaki + Takahiro) + + + + + + + <application>psql</> Display + + + + + Allow psql to use fancy Unicode line-drawing + characters via \pset linestyle unicode (Roger Leigh) + + + + + + Improve display of wrapped columns in psql (Roger + Leigh) + + + + The previous format is available by using \pset linestyle + old-ascii. + + + + + + + + + <application>psql</> <command>\d</> Commands + + + + + Have \d show child tables that inherit from the specified + parent (Damien Clochard) + + + + \d shows only the number of child tables, while + \d+ shows the names of all child tables. + + + + + + Show definition of indexes in \d index_name (Khee Chin) + + + + The definition is useful for expression indexes. + + + + + + In psql, show the view definition only with \d+, + not with \d (Peter) + + + + + + + + + + <application>pg_dump</> + + + + + Have pg_dump/pg_restore + + + + + Fix pg_dump to properly dump large objects if + standard_conforming_strings is enabled (Tom) + + + + Large objects dumps now use hex format for output. (SWITCH DEFAULT + FOR BETA? TOM) + + + + + + Allow pg_dump to dump comments attached to columns + of composite types (Taro Minowa (Higepon)) + + + + + + Have pg_dump + + + These were already present in custom output mode. + + + + + + + + + <application>pg_ctl</> + + + + + Allow pg_ctl to be safely used to start the + postmaster at boot-time (Tom) + + + + Previously the pg_ctl process could have been mistakenly + identified as a running postmaster based on a stale + postmaster lock file. + + + + + + Give pg_ctl the ability to initialize the database + (like initdb) (Zdenek Kotala) + + + + + + + + + + <application>libpq</> + + + + + Add new libpq functions + PQconnectdbParams() and PQconnectStartParams() + (Guillaume Lelarge) + + + + These functions are similar to PQconnectdb() and + PQconnectStart() except they allow a null-terminated + array of connection options, rather than requiring all options to + be sent in a single string. + + + + + + Add libpq functions PQescapeLiteral() and + PQescapeIdentifier() (Robert Haas) + + + + These functions return appropriately quoted and escaped literal + strings and identifiers. The caller is not required to pre-allocate + the string result, as is required by PQescapeStringConn(). + + + + + + Add checking for a per-user service file (.pg_service.conf), + which is checked before the site-wide service file (Peter) + + + + The file .pg_service.conf is assumed to be in the + user's home directory. + + + + + + Properly report an error if the specified libpq service + cannot be found (Peter) + + + + + + Issue a warning if the .pgpass-retrieved password fails + (Bruce) + + + + + + + + + <application>ecpg</> + + + + + Add SQLDA (SQL Descriptor Area) support to ecpg + (Boszormenyi Zoltan) + + + + + + Add the DESCRIBE [OUTPUT] statement to + ecpg (Boszormenyi Zoltan) + + + + + + Add an ecpg function to return the current transaction + status (Bernd Helmle) + + + + + + Add the string data type in ecpg + Informix-compatibility mode (Zoltan Boszormenyi) + + + + + + Allow ecpg to use new and old + variable names without restriction (Michael) + + + + + + Have ecpg return zero for non-SQL3 data types (Michael) + + + + Previously it returned the negative of the data type oid. + + + + + + + <application>ecpg</> Cursors + + + + + Add ecpg out-of-scope cursor support in native mode + (Boszormenyi Zoltan) + + + + This allows DECLARE to use variables that are not in + scope when OPEN is called. This facility already existed + in ecpg Informix-compatibility mode. + + + + + + Allow dynamic ecpg cursor names (Boszormenyi Zoltan) + + + + + + Allow ecpg to use noise words FROM and + IN in FETCH and MOVE (Zoltan + Boszormenyi) + + + + + + + + + + + + + Build Options + + + + + Enable client thread safety by default (Bruce) + + + + Thread-safe builds can be disabled with configure + + + + + + Add a compile-time option to allow the Linux out-of-memory killer + to kill backends (Alex Hunsaker, Tom) + + + + Now that /proc/self/oom_adj allows disabling of the + Linux out-of-memory (OOM) killer for the + postmaster and its children, the new compile-time option + -DLINUX_OOM_ADJ=0 allows the killer to be enabled for + postmaster children. pg_config shows if + this flag was used during compilation. + + + + + + Use DocBook XSL stylesheets for man page + building (Peter) + + + + + + + Makefiles + + + + + New Makefile targets world, + install-world, and installcheck-world (Andrew) + + + + These are similar to the existing all, install, + and installcheck targets, but they build HTML + documentation, build and test /contrib, and test + server-side languages and ecpg. + + + + + + Add data and documentation location control to PGXS + Makefiles (Mark Cave-Ayland) + + + + + + Restructure the HTML documentation build + Makefile rules (Peter) + + + + + + + + + New Requirements + + + + + Require Autoconf 2.63 for building from source (Peter) + + + + + + Require Flex 2.5.31 or later to build from source + (Tom) + + + + + + Require Perl version 5.8 or greater to build the server + from a CVS copy (John Naylor, Andrew) + + + + + + + + + Windows + + + + + Add support for compiling on 64-bit Windows and running + in 64-bit mode (Tsutomu Yamada, Magnus) + + + + This allows for large shared memory sizes on Windows. + + + + + + Allow server builds using Visual Studio 2008 (Magnus) + + + + + + Allow multi-processor compilation using Microsoft Visual + C (Magnus) + + + + + + + + + + + Source Code + + + + + Distribute documentation in a proper directory tree, rather than + as tar archive files inside the main distribution tarball (Peter) + + + + For example, the HTML documentation is now in + doc/src/sgml/html; the manual pages are packaged + similarly. + + + + + + Enable the server lexer to be reentrant (Tom) + + + + This was needed for use of the lexer by PL/pgSQL. + + + + + + Improve speed of memory allocation (Tom, Greg Stark) + + + + + + Add system columns to better document the use of indexes for constraint + enforcement (Tom) + + + + + + Allow multiple actions to be communicated using the same operating + system signal (Fujii Masao) + + + + This allows improved backend communication as new features are + added. + + + + + + Improve source code test coverage, including /contrib, PL/Python, + and PL/Perl (Peter, Andrew) + + + + + + Remove the use of flat files for system table bootstrapping (Tom, + Alvaro) + + + + This also improves performance when using millions of users and + databases. + + + + + + Improve the ability to translate psql strings + (Peter) + + + + + + Reduce the length of some file names so file paths are less than + 100 characters (Tom) + + + + Some decompression programs have problems with long file names. + + + + + + Tighten input requirements for int2 vector input (Caleb + Welton) + + + + + + Properly remove the few remaining personal source code copyright + entries (Bruce) + + + + The personal copyright notices were insignificant but the community + occasionally had to answer questions about them. + + + + + + Add a new ERRCODE_INVALID_PASSWORD SQLSTATE error + code (Bruce) + + + + + + + Feature Support + + + + + Use a more modern API for Bonjour (Tom) + + + + Bonjour now requires OS X 10.3 or later. + + + + + + Add processor test-and-test lock support for the SuperH + architecture (Nobuhiro Iwamatsu) + + + + + + Allow non-GCC compilers to use inline functions if + they support them (Kurt Harriman) + + + + + + Remove support for platforms that don't have a working 64-bit + integer data types (Tom) + + + + It is believed all supported platforms have working 64-bit integer + data types. + + + + + + + + + + Server Programming + + + + + Allow use of C++ functions in backend code (Kurt + Harriman, Peter) + + + + This removes keyword conflicts that previously made C++ + usage difficult in backend code. extern "C" { } might still + be necessary. + + + + + + Add AggCheckCallContext() for use in detecting if a + C function is being called as an aggregate (Hitoshi + Harada) + + + + + + Require fastgetattr() and heap_getattr() + backend macros to use a non-NULL fourth argument (Robert Haas) + KEEP? + + + + + + + + + Server Hooks + + + + + Add parser hooks to access column and parameter references in + queries (Tom) + + + + + + Add a hook so loadable modules can control utility commands (Itagaki + Takahiro) + + + + + + Allow the calling of parser hooks from SPI and cached + plans (Tom) + + + + + + + + + Binary Upgrade Support + + + + + Add support for preservation of all relfilenodes, for + use during binary upgrades (Bruce) + + + + + + Add support for binary upgrades to preserve pg_type + and pg_enum oids (Bruce) + + + + This is needed to allow binary upgrades of user-defined composite + types, arrays, and enums (enumerated types). + + + + + + Move tablespace data directories into their own + PostgreSQL version-specific subdirectory (Bruce) + + + + This simplifies binary upgrades. + + + + + + + + + + + Contrib + + + + + Add multi-threaded option ( + + + This allows multiple CPUs to be used for pgbench tests. + + + + + + Add \shell and \setshell meta commands to + /contrib/pgbench (Michael Paquier) + + + + + + New features for /contrib/dict_xsyn (Sergey Karpov) + + + + The new options are matchorig, matchsynonyms, + and keepsynonyms. + + + + + + Add full text dictionary /contrib/unaccent (Teodor) + + + + This filter dictionary removes accents from tokens. + + + + + + Add dblink_get_notify() to /contrib/dblink + (Marcus Kempe) + + + + This allows async notifications in dblink. + + + + + + Greatly increase /contrib/hstore's length limit and add + btree and hash abilities so GROUP BY and + DISTINCT operations are possible (Andrew Gierth) + + + + New functions and operators were also added. + + + + + + Add /contrib/passwordcheck which can check the strength of + assigned passwords (Laurenz Albe) + + + + The source code of this module should be modified to implement + site-specific password policies. + + + + + + Add query text to /contrib/auto_explain output (Andrew) + + + + + + Add buffer access counters to /contrib/pg_stat_statements + (Itagaki Takahiro) + + + + + + Update /contrib/start-scripts/linux to use + /proc/self/oom_adj to disable the Linux + out-of-memory (OOM) killer (Alex Hunsaker, Tom) + + + + + + + + + + + Release 9.0alpha4 Overview -- 2.40.0