Version Historie vonPostgreSQL 9.0.4 (x64)

• Fix pg_upgrade's handling of TOAST tables (Bruce Momjian)
• The pg_class.relfrozenxid value for TOAST tables was not correctly copied into the new installation during pg_upgrade. This could later result in pg_clog files being discarded while they were still needed to validate tuples in the TOAST tables, leading to "could not access status of transaction" failures.
• This error poses a significant risk of data loss for installations that have been upgraded with pg_upgrade. This patch corrects the problem for future uses of pg_upgrade, but does not in itself cure the issue in installations that have been processed with a buggy version of pg_upgrade.
• Suppress incorrect "PD_ALL_VISIBLE flag was incorrectly set" warning (Heikki Linnakangas)
• VACUUM would sometimes issue this warning in cases that are actually valid.
• Use better SQLSTATE error codes for hot standby conflict cases (Tatsuo Ishii and Simon Riggs)
• All retryable conflict errors now have an error code that indicates that a retry is possible. Also, session closure due to the database being dropped on the master is now reported as ERRCODE_DATABASE_DROPPED, rather than ERRCODE_ADMIN_SHUTDOWN, so that connection poolers can handle the situation correctly.
• Prevent intermittent hang in interactions of startup process with bgwriter process (Simon Riggs)
• This affected recovery in non-hot-standby cases.
• Disallow including a composite type in itself (Tom Lane)
• This prevents scenarios wherein the server could recurse infinitely while processing the composite type. While there are some possible uses for such a structure, they don't seem compelling enough to justify the effort required to make sure it always works safely.
• Avoid potential deadlock during catalog cache initialization (Nikhil Sontakke)
• In some cases the cache loading code would acquire share lock on a system index before locking the index's catalog. This could deadlock against processes trying to acquire exclusive locks in the other, more standard order.
• Fix dangling-pointer problem in BEFORE ROW UPDATE trigger handling when there was a concurrent update to the target tuple (Tom Lane)
• This bug has been observed to result in intermittent "cannot extract system attribute from virtual tuple" failures while trying to do UPDATE RETURNING ctid. There is a very small probability of more serious errors, such as generating incorrect index entries for the updated tuple.
• Disallow DROP TABLE when there are pending deferred trigger events for the table (Tom Lane)
• Formerly the DROP would go through, leading to "could not open relation with OID nnn" errors when the triggers were eventually fired.
• Allow "replication" as a user name in pg_hba.conf (Andrew Dunstan)
• "replication" is special in the database name column, but it was mistakenly also treated as special in the user name column.
• Prevent crash triggered by constant-false WHERE conditions during GEQO optimization (Tom Lane)
• Improve planner's handling of semi-join and anti-join cases (Tom Lane)
• Fix handling of SELECT FOR UPDATE in a sub-SELECT (Tom Lane)
• This bug typically led to "cannot extract system attribute from virtual tuple" errors.
• Fix selectivity estimation for text search to account for NULLs (Jesper Krogh)
• Fix get_actual_variable_range() to support hypothetical indexes injected by an index adviser plugin (Gurjeet Singh)
• Fix PL/Python memory leak involving array slices (Daniel Popowich)
• Allow libpq's SSL initialization to succeed when user's home directory is unavailable (Tom Lane)
• If the SSL mode is such that a root certificate file is not required, there is no need to fail. This change restores the behavior to what it was in pre-9.0 releases.
• Fix libpq to return a useful error message for errors detected in conninfo_array_parse (Joseph Adams)
• A typo caused the library to return NULL, rather than the PGconn structure containing the error message, to the application.
• Fix ecpg preprocessor's handling of float constants (Heikki Linnakangas)
• Fix parallel pg_restore to handle comments on POST_DATA items correctly (Arnd Hannemann)
• Fix pg_restore to cope with long lines (over 1KB) in TOC files (Tom Lane)
• Put in more safeguards against crashing due to division-by-zero with overly enthusiastic compiler optimization (Aurelien Jarno)
• Support use of dlopen() in FreeBSD and OpenBSD on MIPS (Tom Lane)
• There was a hard-wired assumption that this system function was not available on MIPS hardware on these systems. Use a compile-time test instead, since more recent versions have it.
• Fix compilation failures on HP-UX (Heikki Linnakangas)
• Avoid crash when trying to write to the Windows console very early in process startup (Rushabh Lathia)
• Support building with MinGW 64 bit compiler for Windows (Andrew Dunstan)
• Fix version-incompatibility problem with libintl on Windows (Hiroshi Inoue)
• Fix usage of xcopy in Windows build scripts to work correctly under Windows 7 (Andrew Dunstan)
• This affects the build scripts only, not installation or usage.
• Fix path separator used by pg_regress on Cygwin (Andrew Dunstan)
• Update time zone data files to tzdata release 2011f for DST law changes in Chile, Cuba, Falkland Islands, Morocco, Samoa, and Turkey; also historical corrections for South Australia, Alaska, and Hawaii.