Functionality added or changed:
files (created in the data directory) to
This avoids problems on file systems that do not allow
multiple periods in file names.
to mysqld to control whether output from
SHOW INNODB STATUS is written
file in the data directory. By default, the file is not
created. To create it, start mysqld with
Changes for NetWare to exit InnoDB gracefully on NetWare even
in a case of an assertion failure, instead of intentionally
`mysqld' server process.
Fixed a bug in
ON DELETE CASCADE and
ON UPDATE CASCADE foreign key constraints:
long chains of cascaded operations would cause a stack
overflow and crash the server. Cascaded operations are now
limited to 15 levels. (Bug #4446)
Fixed a possible bug in
TABLES introduced in MySQL/InnoDB-4.0.19: The count
of tables explicitly locked by a transaction was incremented
only after the locks were granted, but decremented when the
lock structures were destroyed.
Fixed a bug in
0 mode, introduced in MySQL/InnoDB-4.0.19: The
memory allocated for some locks acquired by the transaction
could be deallocated before those locks were released. The bug
can lead to crashes and memory corruption of the buffer pool
when the transaction acquires a large number of locks (table
locks or row-level locks).
Increment the InnoDB watchdog timeout during
CHECK TABLE. A long-running
CHECK TABLE would cause InnoDB
to complain about a 'long semaphore wait', and crash the
server, if a query had to wait more than 600 seconds behind
CHECK TABLE operation.
If you configure
so small that InnoDB memory allocation spills over from it,
then every 4 billionth spill may cause memory corruption. A
symptom is a printout like the one following in the
.err log. The workaround is to make
big enough to hold all memory allocation. Use
SHOW INNODB STATUS to determine
that there is plenty of free space available in the additional
mem pool, and the total allocated memory stays rather
InnoDB: Error: Mem area size is 0. Possibly a memory overrun of the InnoDB: previous allocated area! InnoDB: Apparent memory corruption: mem dump len 500; hex
The special meaning of the table names
CREATE TABLE and
DROP TABLE statements was
accidentally removed in MySQL/InnoDB-4.0.19. The diagnostic
functions attached to these special table names (see
Section 126.96.36.199, “SHOW ENGINE INNODB STATUS and the InnoDB Monitors”) are accessible again in
When the private SQL parser of InnoDB was modified in
MySQL/InnoDB-4.0.19 to allow the use of the apostrophe
'”) in table and column
names, the fix relied on a previously unused function
mem_realloc(), whose implementation was
incorrect. As a result, InnoDB can incorrectly parse column
and table names as the empty string. The InnoDB
realloc() implementation has been
corrected in MySQL/InnoDB-4.0.21.
Fixed a glitch introduced in 4.0.18 and 4.1.2: in
SHOW TABLE STATUS InnoDB
systematically overestimated the row count by 1 if the table
fit on a single 16 kB data page.
InnoDB created temporary files with the C library function
tmpfile(). On Windows, the files would be
created in the root directory of the current file system. To
correct this behavior, the invocations of
tmpfile() were replaced with code that
uses the function
the MySQL portability layer. (Bug #3998)
ALTER TABLE ... DROP FOREIGN KEY ...
fails because of a wrong constraint name, return a table
handler error number 150 instead of 152.
If there was little file I/O in InnoDB, but the insert buffer was used, it could happen that 'Pending normal aio reads' was bigger than 0, but the I/O handler thread did not get waken up in 600 seconds. This resulted in a hang, and crashing of InnoDB.
RENAMEd a table, InnoDB forgot to
FOREIGN KEY constraints that
reference the new table name, and forgot to check that they
are compatible with the table.