Release date: 2013-12-05
This release contains a variety of fixes from 8.4.18. For information about new features in the 8.4 major release, see Section E.181.
A dump/restore is not required for those running 8.4.X.
However, this release corrects a potential data corruption issue. See the first changelog entry below to find out whether your installation has been affected and what steps you can take if so.
Also, if you are upgrading from a version earlier than 8.4.17, see Section E.164.
VACUUM's tests to see
whether it can update
relfrozenxid (Andres Freund)
In some cases
(either manual or autovacuum) could incorrectly advance a
value, allowing tuples to escape freezing, causing those
rows to become invisible once 2^31 transactions have
elapsed. The probability of data loss is fairly low since
multiple incorrect advancements would need to happen
before actual loss occurs, but it's not zero. Users
upgrading from release 8.4.8 or earlier are not affected,
but all later versions contain the bug.
The issue can be ameliorated by, after upgrading,
vacuuming all tables in all databases while having
vacuum_freeze_table_age set to zero. This will
fix any latent corruption but will not be able to fix all
pre-existing data errors. However, an installation can be
presumed safe after performing this vacuuming if it has
executed fewer than 2^31 update transactions in its
lifetime (check this with
txid_current() < 2^31).
Fix race condition in GIN index posting tree page deletion (Heikki Linnakangas)
This could lead to transient wrong answers or query failures.
Avoid flattening a subquery whose
SELECT list contains a volatile function
wrapped inside a sub-
This avoids unexpected results due to extra evaluations of the volatile function.
Fix planner's processing of non-simple-variable subquery outputs nested within outer joins (Tom Lane)
This error could lead to incorrect plans for queries
involving multiple levels of subqueries within
Fix premature deletion of temporary files (Andres Freund)
Fix possible read past end of memory in rule printing (Peter Eisentraut)
Fix array slicing of
oidvector values (Tom Lane)
Expressions of this kind are now implicitly promoted
Fix incorrect behaviors when using a SQL-standard, simple GMT offset timezone (Tom Lane)
In some cases, the system would use the simple GMT
offset value when it should have used the regular
timezone setting that had prevailed before the simple
offset was selected. This change also causes the
timeofday function to honor
the simple GMT offset zone.
Prevent possible misbehavior when logging translations of Windows error codes (Tom Lane)
Properly quote generated command lines in pg_ctl (Naoya Anzai and Tom Lane)
This fix applies only to Windows.
Fix pg_dumpall to
work when a source database sets
ALTER DATABASE SET (Kevin
Previously, the generated script would fail during restore.
Fix ecpg's processing
of lists of variables declared
varchar (Zoltán Böszörményi)
against incorrect trigger definitions (Marc Cousin)
Update time zone data files to tzdata release 2013h for DST law changes in Argentina, Brazil, Jordan, Libya, Liechtenstein, Morocco, and Palestine. Also, new timezone abbreviations WIB, WIT, WITA for Indonesia.
If you see anything in the documentation that is not correct, does not match your experience with the particular feature or requires further clarification, please use this form to report a documentation issue.