- Fixing this required changing the WAL logging format for tuple freezing.
- While this is unimportant for standalone servers, in replication
- environments it means that standby servers must be upgraded
+ Fixing this required changing the WAL record format for tuple
+ freezing. While this is no issue for standalone servers, when using
+ replication it means that standby servers must be upgraded
to 9.3.3 or later before their masters are. An older standby will
- be unable to interpret freeze records generated by a newer master,
- and will fail with a PANIC message. (In such a case, upgrading the
+ be unable to interpret freeze records generated by a newer master, and
+ will fail with a PANIC message. (In such a case, upgrading the
standby should be sufficient to let it resume execution.)
If a row was locked by transaction A, and transaction B updated it,
the new version of the row created by B would be locked by A, yet
- visible only to B. This case is new in 9.3 since prior versions did
- not have any types of row locking that would permit another
- transaction to update the row at all. If transaction B then deleted
- or key-updated the row, A's lock wouldn't get checked, thus possibly
- allowing B to complete when it shouldn't.
+ visible only to B. If transaction B then again updated the row, A's
+ lock wouldn't get checked, thus possibly allowing B to complete when
+ it shouldn't. This case is new in 9.3 since prior versions did not
+ have any types of row locking that would permit another transaction
+ to update the row at all.
This oversight could allow referential integrity checks to give false
- positives (that is, allow deletes that should have been rejected).
+ positives (for instance, allow deletes that should have been rejected).
Applications using the new commands SELECT FOR KEY SHARE
and SELECT FOR NO KEY UPDATE might also have suffered
locking failures of this kind.
Prevent forgetting valid row locks when one of several
holders of a row lock aborts (Álvaro Herrera)
+
+ This was yet another mechanism by which a shared row lock could be
+ lost, thus possibly allowing updates that should have been prevented
+ by foreign-key constraints.
+
- Fix handling of 5-digit filenames in pg_multixact/members
- (Álvaro Herrera)
-
-
- As of 9.3, these names can be more than 4 digits, but the directory
- cleanup code ignored such files.
+ Handle wraparound correctly during extension or truncation
+ of pg_multixact/members
+ (Andres Freund, Álvaro Herrera)
- Handle wraparound correctly during extension or truncation
- of pg_multixact/members
- (Andres Freund, Álvaro Herrera)
+ Fix handling of 5-digit filenames in pg_multixact/members
+ (Álvaro Herrera)
+
+
+ As of 9.3, these names can be more than 4 digits, but the directory
+ cleanup code ignored such files.
- Previously, not-yet-archived segments could get ignored during replay.
- This reverts an undesirable behavioral change in 9.3.0 back to the
- way things worked pre-9.3.
+ Previously, not-yet-archived segments could get ignored during
+ recovery. This reverts an undesirable behavioral change in 9.3.0
+ back to the way things worked pre-9.3.
applied far beyond where the end-of-file should have been. This
failure mode does not appear to be a significant risk during crash
recovery, only when initially synchronizing a standby created from a
- base backup taken from an actively-changing master.
+ base backup taken from a quickly-changing master.
In some cases WAL replay would mistakenly conclude that the database
was already consistent at the start of replay, thus possibly allowing
- queries before the database was really consistent. Other symptoms
- such as PANIC: WAL contains references to invalid pages
- were also possible.
+ hot-standby queries before the database was really consistent. Other
+ symptoms such as PANIC: WAL contains references to invalid
+ pages were also possible.
Fix improper locking of btree index pages while replaying
- a VACUUM operation in Hot Standby mode (Andres Freund,
+ a VACUUM operation in hot-standby mode (Andres Freund,
Heikki Linnakangas, Tom Lane)
- Ensure that insertions into non-leaf GIN index pages make a full-page
+ Ensure that insertions into non-leaf GIN index pages write a full-page
WAL record when appropriate (Heikki Linnakangas)
- The previous coding risked data corruption in the event of a
- torn-page update.
+ The previous coding risked index corruption in the event of a
+ partial-page write during a system crash.
- Ensure walreceiver sends Hot Standby feedback messages on time even
+ Ensure walreceiver sends hot-standby feedback messages on time even
when there is a continuous stream of data (Andres Freund, Amit
Kapila)
- Fix unsafe references to errno within error messaging
+ Fix unsafe references to errno within error reporting
logic (Christian Kruse)
- Clear retry flags properly in replacement OpenSSL socket write
+ Clear retry flags properly in OpenSSL socket write
function (Alexander Kukushkin)
- This omission resulted in a server lockup after unexpected loss of an
- SSL-encrypted connection.
+ This omission could result in a server lockup after unexpected loss
+ of an SSL-encrypted connection.
ANALYZE intentionally omits very wide values from its
- histogram and most-common-value calculations, but it neglected to do
+ histogram and most-common-values calculations, but it neglected to do
something sane in the case that all the sampled entries are too wide.
- CREATE TABLE works this way, but ALTER TABLE
- didn't get the memo.
+ CREATE TABLE has always allowed such usage,
+ but ALTER TABLE didn't get the memo.
- Fix cannot accept a set error when some arms of a CASE
- return a set and others don't (Tom Lane)
+ Fix cannot accept a set error when some arms of
+ a CASE return a set and others don't (Tom Lane)
Accept SHIFT_JIS as an encoding name for locale checking
- (Tatsuo Ishii)
+ purposes (Tatsuo Ishii)
- Improve error handling in
psql and libpq+ Improve error handling in
libpq and psql for failures during COPY TO STDOUT/FROM STDIN (Tom Lane)
-
-
-
- Avoid including tablespaces inside PGDATA twice in base backups
- (Dimitri Fontaine, Magnus Hagander)
-
-
-
+
+
+ Avoid including tablespaces inside PGDATA twice in base backups
+ (Dimitri Fontaine, Magnus Hagander)
+
+
+
-
-
- Avoid using the deprecated dllwrap tool in Cygwin builds
- (Marco Atzeri)
-
-
-
+
+
+ Avoid using the deprecated dllwrap tool in Cygwin builds
+ (Marco Atzeri)
+
+
+
projects / postgresql.git / commitdiff