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Changes:
* Fix incorrect password transformation in contrib/pgcrypto's DES crypt()
function (Solar Designer)
* Ignore SECURITY DEFINER and SET attributes for a procedural language's call
handler (Tom Lane)
* Allow numeric timezone offsets in timestamp input to be up to 16 hours away
from UTC (Tom Lane)
* Fix timestamp conversion to cope when the given time is exactly the last DST
transition time for the current timezone (Tom Lane)
* Fix text to name and char to name casts to perform string truncation
correctly in multibyte encodings (Karl Schnaitter)
* Fix memory copying bug in to_tsquery() (Heikki Linnakangas)
* Ensure txid_current() reports the correct epoch when executed in hot standby
(Simon Riggs)
* Fix planner's handling of outer PlaceHolderVars within subqueries (Tom Lane)
* Fix slow session startup when pg_attribute is very large (Tom Lane)
* Ensure sequential scans check for query cancel reasonably often (Merlin
Moncure)
* Ensure the Windows implementation of PGSemaphoreLock() clears
ImmediateInterruptOK before returning (Tom Lane)
* Show whole-row variables safely when printing views or rules (Abbas Butt, Tom
Lane)
* Fix COPY FROM to properly handle null marker strings that correspond to
invalid encoding (Tom Lane)
* Ensure autovacuum worker processes perform stack depth checking properly
(Heikki Linnakangas)
* Fix logging collector to not lose log coherency under high load (Andrew
Dunstan)
* Fix logging collector to ensure it will restart file rotation after receiving
SIGHUP (Tom Lane)
* Fix WAL replay logic for GIN indexes to not fail if the index was
subsequently dropped (Tom Lane)
* Fix memory leak in PL/pgSQL's RETURN NEXT command (Joe Conway)
* Fix PL/pgSQL's GET DIAGNOSTICS command when the target is the function's
first variable (Tom Lane)
* Fix potential access off the end of memory in psql's expanded display (\x)
mode (Peter Eisentraut)
* Fix several performance problems in pg_dump when the database contains many
*bjects (Jeff Janes, Tom Lane)
* Fix pg_upgrade for the case that a database stored in a non-default
tablespace contains a table in the cluster's default tablespace (Bruce Momjian)
* In ecpg, fix rare memory leaks and possible overwrite of one byte after the
sqlca_t structure (Peter Eisentraut)
* Fix contrib/dblink's dblink_exec() to not leak temporary database connections
upon error (Tom Lane)
* Fix contrib/dblink to report the correct connection name in error messages
(Kyotaro Horiguchi)
* Fix contrib/vacuumlo to use multiple transactions when dropping many large
*bjects (Tim Lewis, Robert Haas, Tom Lane)
* Update time zone data files to tzdata release 2012c for DST law changes in
Antarctica, Armenia, Chile, Cuba, Falkland Islands, Gaza, Haiti, Hebron,
Morocco, Syria, and Tokelau Islands;
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* fix build issues on HP-UX and Itanium
* update time zone files for recent time zone changes
* change SQLSTATE for Hot Standby warnings
* prevent bgwriter hang during recovery
* prevent recursive composite type creation
* disallow dropping tables whose triggers are still pending
* allow use of "replication" as a user name
* prevent a crash during GEQO planning
* improve join plans for tables with missing statistics
* fix error with SELECT FOR UPDATE in a subselect
* close PL/python array slice memory leak
* allow SSL connections for users with no home directory
* allow building PostgreSQL 9.0 with 64-bit MinGW
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* Before exiting walreceiver, ensure all the received WAL is fsync'd to disk
* Avoid excess fsync activity in walreceiver
* Make "ALTER TABLE" revalidate uniqueness and exclusion constraints when needed
* Fix EvalPlanQual for "UPDATE" of an inheritance tree in which the tables are
not all alike
* Avoid failures when "EXPLAIN" tries to display a simple-form CASE expression
* Fix assignment to an array slice that is before the existing range of
subscripts
* Avoid unexpected conversion overflow in planner for very distant date values
* Fix PL/Python crash when an array contains null entries
* Remove ecpg's fixed length limit for constants defining an array dimension
* Fix erroneous parsing of tsquery values containing ... &
!(subexpression) | ...
* Fix buffer overrun in "contrib/intarray"'s input function for the query_int
type
* Fix bug in "contrib/seg"'s GiST picksplit algorithm
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* Force the default wal_sync_method to be fdatasync on Linux
* Fix "too many KnownAssignedXids" error during Hot Standby replay
* Fix race condition in lock acquisition during Hot Standby
* Avoid unnecessary conflicts during Hot Standby
* Fix assorted bugs in WAL replay logic for GIN indexes
* Fix recovery from base backup when the starting checkpoint WAL
record is not in the same WAL segment as its redo point
* Fix corner-case bug when streaming replication is enabled
immediately after creating the master database cluster
* Fix persistent slowdown of autovacuum workers when multiple workers
remain active for a long time
* Fix long-term memory leak in autovacuum launcher
* Avoid failure when trying to report an impending transaction
wraparound condition from outside a transaction
* Add support for detecting register-stack overrun on IA64
* Add a check for stack overflow in copyObject()
* Fix detection of page splits in temporary GiST indexes
* Fix error checking during early connection processing
* Improve efficiency of window functions
* Avoid memory leakage while "ANALYZE"'ing complex index expressions
* Ensure an index that uses a whole-row Var still depends on its table
* Add missing support in "DROP OWNED BY" for removing foreign data
wrapper/server privileges belonging to a user
* Do not "inline" a SQL function with multiple OUT parameters
* Fix crash when inline-ing a set-returning function whose argument
list contains a reference to an inline-able user function
* Behave correctly if ORDER BY, LIMIT, FOR UPDATE, or WITH is
attached to the VALUES part of INSERT ... VALUES
* Make the OFF keyword unreserved
This prevents problems with using off as a variable name in
PL/pgSQL. That worked before 9.0, but was now broken because
PL/pgSQL now treats all core reserved words as reserved.
* Fix constant-folding of COALESCE() expressions
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This package provides the following PostgreSQL modules:
- auto_explain
- pg_buffercache
- pg_stat_statements
- pgstattuple
The "auto_explain" module provides a means for logging execution
plans of slow statements automatically, without having to run
EXPLAIN(7) by hand. This is especially helpful for tracking down
un-optimized queries in large applications.
The "pg_buffercache" module provides a means for examining what's
happening in the shared buffer cache in real time.
The "pg_stat_statements" module provides a means for tracking
execution statistics of all SQL statements executed by a server.
The "pgstattuple" module provides various functions to obtain
tuple-level statistics.
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