Release date: 2010-12-16
This release contains a variety of fixes from 8.4.5. 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, if you are upgrading from a version earlier than 8.4.2, see Section E.179.
Force the default
wal_sync_method to be
fdatasync on Linux (Tom Lane, Marti
The default on Linux has actually been
fdatasync for many years, but recent
kernel changes caused PostgreSQL to choose
open_datasync instead. This choice did
not result in any performance improvement, and caused
outright failures on certain filesystems, notably
ext4 with the
data=journal mount option.
Fix assorted bugs in WAL replay logic for GIN indexes (Tom Lane)
This could result in “bad buffer id: 0” failures or corruption of index contents during replication.
Fix recovery from base backup when the starting checkpoint WAL record is not in the same WAL segment as its redo point (Jeff Davis)
Fix persistent slowdown of autovacuum workers when multiple workers remain active for a long time (Tom Lane)
vacuum_cost_limit for an autovacuum
worker could drop to nearly zero if it processed enough
tables, causing it to run extremely slowly.
Add support for detecting register-stack overrun on
IA64 (Tom Lane)
IA64 architecture has
two hardware stacks. Full prevention of stack-overrun
failures requires checking both.
Add a check for stack overflow in
copyObject() (Tom Lane)
Certain code paths could crash due to stack overflow given a sufficiently complex query.
Fix detection of page splits in temporary GiST indexes (Heikki Linnakangas)
It is possible to have a “concurrent” page split in a temporary index, if for example there is an open cursor scanning the index when an insertion is done. GiST failed to detect this case and hence could deliver wrong results when execution of the cursor continued.
Fix error checking during early connection processing (Tom Lane)
The check for too many child processes was skipped in some cases, possibly leading to postmaster crash when attempting to add the new child process to fixed-size arrays.
Improve efficiency of window functions (Tom Lane)
Certain cases where a large number of tuples needed to
be read in advance, but
work_mem was large enough to allow them
all to be held in memory, were unexpectedly slow.
ntile() in particular were
subject to this problem.
Avoid memory leakage while
ANALYZE'ing complex index expressions
Ensure an index that uses a whole-row Var still depends on its table (Tom Lane)
An index declared like
index i on t (foo(t.*)) would not automatically
get dropped when its table was dropped.
Do not “inline” a SQL function with
OUT parameters (Tom
This avoids a possible crash due to loss of information about the expected result rowtype.
Behave correctly if
FOR UPDATE, or
WITH is attached to the
VALUES part of
INSERT ... VALUES (Tom Lane)
Fix constant-folding of
COALESCE() expressions (Tom Lane)
The planner would sometimes attempt to evaluate sub-expressions that in fact could never be reached, possibly leading to unexpected errors.
Fix postmaster crash when connection acceptance
accept() or one of the
calls made immediately after it) fails, and the
postmaster was compiled with GSSAPI support (Alexander
Fix missed unlink of temporary files when
log_temp_files is active (Tom Lane)
If an error occurred while attempting to emit the log message, the unlink was not done, resulting in accumulation of temp files.
Add print functionality for
InhRelation nodes (Tom Lane)
This avoids a failure when
debug_print_parse is enabled and certain
types of query are executed.
Fix incorrect calculation of distance from a point to a horizontal line segment (Tom Lane)
This bug affected several different geometric distance-measurement operators.
Fix incorrect calculation of transaction status in ecpg (Itagaki Takahiro)
Fix PL/pgSQL's handling of “simple” expressions to not fail in recursion or error-recovery cases (Tom Lane)
Fix PL/Python's handling of set-returning functions (Jan Urbanski)
Attempts to call SPI functions within the iterator generating a set result would fail.
Fix bug in
contrib/cube's GiST picksplit algorithm
This could result in considerable inefficiency, though
not actually incorrect answers, in a GiST index on a
cube column. If you have such
an index, consider
REINDEXing it after installing this
Don't emit “identifier will be truncated”
except when creating new connections (Itagaki
Fix potential coredump on missing public key in
Fix memory leak in
contrib/xml2's XPath query functions
Update time zone data files to tzdata release 2010o for DST law changes in Fiji and Samoa; also historical corrections for Hong Kong.
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