* Fix bugs in indexing of in-doubt HOT-updated tuples
* Fix multiple bugs in GiST index page split processing
* Fix possible buffer overrun in tsvector_concat()
* Fix crash in xml_recv when processing a "standalone" parameter
* Make pg_options_to_table return NULL for an option with no value
* Avoid possibly accessing off the end of memory in "ANALYZE" and in
SJIS-2004 encoding conversion
* Prevent intermittent hang in interactions of startup process with
bgwriter process
* Fix race condition in relcache init file invalidation
* Fix memory leak at end of a GiST index scan
* Fix incorrect memory accounting (leading to possible memory bloat)
in tuplestores supporting holdable cursors and plpgsql's RETURN
NEXT command
* Fix performance problem when constructing a large, lossy bitmap
* Fix join selectivity estimation for unique columns
* Fix nested PlaceHolderVar expressions that appear only in
sub-select target lists
* Allow nested EXISTS queries to be optimized properly
* Fix array- and path-creating functions to ensure padding bytes are zeroes
* Fix "EXPLAIN" to handle gating Result nodes within inner-indexscan subplans
* Work around gcc 4.6.0 bug that breaks WAL replay
* Fix dump bug for VALUES in a view
* Disallow SELECT FOR UPDATE/SHARE on sequences
This operation doesn't work as expected and can lead to failures.
* Fix "VACUUM" so that it always updates pg_class.reltuples/relpages
* more...
monitoring tools and commands. Each user has their own favorite features which
will make day-to-day work with PostgreSQL easier and more productive for them.
Among the most popular enhancements are:
* Parallel Database Restore, speeding up recovery from backup up to 8 times
* Per-Column Permissions, allowing more granular control of sensitive data
* Per-database Collation Support, making PostgreSQL more useful in
multi-lingual environments
* In-place Upgrades through pg_migrator (beta), enabling upgrades from 8.3 to
8.4 without extensive downtime
* New Query Monitoring Tools, giving administrators more insight into query
activity
* Greatly Reduced VACUUM Overhead through the Visibility Map
* New Monitoring Tools for current queries, query load and deadlocks
Version 8.4 also makes data analysis easier through the advanced ANSI SQL2003
features of windowing functions, common table expressions and recursive queries.
Enhancements to stored procedures, such as default parameters and variadic
parameters, make database server programming simpler and more compact.
Of course, there are also performance improvements included in this version.
