Add Mac OS X Rendezvous server support (Chris Campbell)
This allows Mac OS X hosts to query the network for available
- PostgreSQL servers.
max_connections> 100, if possible (Tom)
- Prior versions defaulted to 64 shared buffers so PostgreSQL
+ Prior versions defaulted to 64 shared buffers so
PostgreSQL
would start on even very old systems. This release tests the
amount of shared memory allowed by the platform and selects more
reasonable default values if possible. Of course, users are
The SQL standard says that an aggregate function appearing
within a nested subquery belongs to the outer query if its
- argument contains only outer-query variables. Prior PostgreSQL
- releases did not handle this fine point correctly.
+ argument contains only outer-query variables. Prior
+
PostgreSQL releases did not handle
+ this fine point correctly.
By default, tables mentioned in the query are automatically
added to the FROM> clause if they are not already
- there. This is compatible with historic POSTGRES behavior but
- is contrary to the SQL standard. This option allows selecting
+ there. This is compatible with historic
+
POSTGRES behavior but is contrary to
+ the SQL standard. This option allows selecting
standard-compatible behavior.
Fix several zero-column table bugs (Tom)
- PostgreSQL supports zero-column tables. This fixes various bugs
+
PostgreSQL supports zero-column tables. This fixes various bugs
that occur when using such tables.
Long options for pg_dump are now available on all platforms
- PostgreSQL now includes its own long-option processing routines.
+
PostgreSQL now includes its own
+ long-option processing routines.
Allow libpq to compile with Borland C++ compiler (Lester Godwin, Karl Waclawek)
Use our own version of getopt_long() if needed (Peter)
Convert administration scripts to C (Peter)
-
Bison >= 1.85 is now required to build the PostgreSQL grammar, if building from CVS
+
Bison >= 1.85 is now required to build the PostgreSQL> grammar, if building from CVS
Merge documentation into one book (Peter)
Add Windows compatibility functions (Bruce)
Allow client interfaces to compile under MinGW (Bruce)
A dump/restore is not required for those
running version 7.3. However, it should be noted that the main
- PostgreSQL interface library, libpq, has a new major version
- number for this release, which may require recompilation of client
- code in certain cases.
+
PostgreSQL interface library, libpq,
+ has a new major version number for this release, which may require
+ recompilation of client code in certain cases.
Drop Column
- PostgreSQL now supports the ALTER TABLE ... DROP
- COLUMN functionality.
+
PostgreSQL now supports the
+ ALTER TABLE ... DROP COLUMN functionality.
Prepared Queries
- PostgreSQL now supports prepared queries, for improved
- performance.
+
PostgreSQL now supports prepared
+ queries, for improved performance.
Dependency Tracking
- PostgreSQL now records object dependencies, which allows
- improvements in many areas. DROP
- statements now take either CASCADE> or
- RESTRICT> to control whether dependent objects are
- also dropped.
+
PostgreSQL now records object
+ dependencies, which allows improvements in many areas.
+ DROP statements now take either
+ CASCADE> or RESTRICT> to control whether
+ dependent objects are also dropped.
Add pg_locks view to show locks (Neil)
Security fixes for password negotiation memory allocation (Neil)
-
Remove support for version 0 FE/BE protocol (PostgreSQL 6.2 and earlier) (Tom)
+
Remove support for version 0 FE/BE protocol (PostgreSQL 6.2 and earlier) (Tom)
Reserve the last few backend slots for superusers, add parameter superuser_reserved_connections to control this (Nigel J. Andrews)
This release focuses on removing limitations that have existed in the
- PostgreSQL code for many years.
+
PostgreSQL code for many years.
-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.
+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.
- This removes our old
- table-level locking, and replaces it with a locking system that is
- superior to most commercial database systems. In a traditional system,
- each row that is modified is locked until committed, preventing reads by
- other users. MVCC uses the natural multiversion nature of PostgreSQL
- to allow readers to continue reading consistent data during writer
- activity. Writers continue to use the compact pg_log transaction
- system. This is all performed without having to allocate a lock for
- every row like traditional database systems. So, basically, we no
- longer are restricted by simple table-level locking;
- we have something better than row-level locking.
+ This removes our old table-level locking, and replaces it with
+ a locking system that is superior to most commercial database
+ systems. In a traditional system, each row that is modified
+ is locked until committed, preventing reads by other users.
+ MVCC uses the natural multiversion nature of
+
PostgreSQL to allow readers to
+ continue reading consistent data during writer activity.
+ Writers continue to use the compact pg_log transaction system.
+ This is all performed without having to allocate a lock for
+ every row like traditional database systems. So, basically,
+ we no longer are restricted by simple table-level locking; we
+ have something better than row-level locking.
- We continue to speed up PostgreSQL, thanks to the variety of
- talents within our team. We have sped up memory allocation,
- optimization, table joins, and row transfer routines.
+ We continue to speed up
PostgreSQL,
+ thanks to the variety of talents within our team. We have
+ sped up memory allocation, optimization, table joins, and row
+ transfer routines.