Better error message when the server has to crash because the buffer pool is exhausted by the lock table or the adaptive hash index.

Print always the count of pending pread() and pwrite() calls if there is a long semaphore wait.

Improve space utilization when rows of 1,500 to 8,000 bytes are inserted in the order of the primary key.

Remove potential buffer overflow errors by sending diagnostic output to stderr or files instead of stdout or fixed-size memory buffers. As a side effect, the output of SHOW INNODB STATUS is written to a file <datadir>/innodb.status.<pid> every 15 seconds.

Fixed a bug: DROP DATABASE did not work if FOREIGN KEY references were defined within the database. (Bug#3058)

Remove unnecessary files, functions and variables. Many of these were needed in the standalone version of InnoDB. Remove debug functions and variables from nondebug build.

Add diagnostic code to analyze an assertion failure in ha_innodb.cc on line 2020 reported by a user. (Bug#2903)

Fixed a bug: in a FOREIGN KEY, ON UPDATE CASCADE was not triggered if the update changed a string to another value identical in alphabetical ordering, for example, “abc” -> “aBc”.

Protect the reading of the latest foreign key error explanation buffer with a mutex; in theory, a race condition could cause SHOW INNODB STATUS print garbage characters after the error info.

Fixed a bug: The row count and key cardinality estimate was grossly too small if each clustered index page only contained one record.

Parse CONSTRAINT FOREIGN KEY correctly. (Bug#3332)

Fixed a memory corruption bug on Windows. The bug is present in all InnoDB versions in Windows, but it depends on how the linker places a static array in srv0srv.c, whether the bug shows itself. 4 bytes were overwritten with a pointer to a statically allocated string 'get windows aio return value'.

Fix a glitch reported by Philippe Lewicki on the general mailing list: do not print a warning to the .err log if read_key fails with a lock wait timeout error 146.

Allow quotes to be embedded in strings in the private SQL parser of InnoDB, so that “'” can be used in InnoDB table and column names. Display quotes within identifiers properly.

Debugging: Allow UNIV_SYNC_DEBUG to be disabled while UNIV_DEBUG is enabled.

Debugging: Handle magic numbers in a more consistent way.