Rows_examined count in slow query
Fixed bug when using a reference to an
AVG() column in
Fixed that date functions that require correct dates, like
DAYOFYEAR(column), will return
Fixed bug in const-propagation when comparing columns of
different types. (
SELECT * FROM
date_col="2001-01-01" and date_col=time_col)
Fixed bug that caused error message
because of unique constraint with some
GROUP BY queries.
Fixed problem with
sjis character strings
used within quoted table names.
Fixed core dump when using
FULLTEXT keys with other storage engines than
signal() on Windows because
this appears to not be 100% reliable.
Fixed bug when doing
on an indexed column that had
Fixed bug when doing
LEFT JOIN ... ON (col_name =
constant) WHERE col_name = constant.
When using replications, aborted queries that contained
% could cause a core dump.
TCP_NODELAY was not used on some systems.
Applied portability fixes for OS/2. (Patch by Yuri Dario.)
The following changes are for
InnoDB variables to
Foreign keys checking is now done for
DROP DATABASE now works also for
InnoDB now supports datafiles and raw
disk partitions bigger than 4 GB on those operating systems
that have big files.
InnoDB calculates better table
cardinality estimates for the MySQL optimizer.
Accent characters in the default character set
latin1 are ordered according to the MySQL
Note: if you are using
latin1 and have
inserted characters whose code is greater than 127 into an
CHAR column, you should run
CHECK TABLE on your table when you
upgrade to 3.23.44, and drop and reimport the table if
CHECK TABLE reports an error!
innodb_thread_concurrency, helps in
performance tuning in heavily concurrent environments.
innodb_fast_shutdown, speeds up server
innodb_force_recovery, helps to save your
data in case the disk image of the database becomes corrupt.
innodb_monitor has been improved and a
Increased maximum key length from 500 to 7000 bytes.
Fixed a bug in replication of
AUTO_INCREMENT columns with multiple-line
Fixed a bug when the case of letters changes in an update of an indexed secondary column.
Fixed a hang when there are > 24 datafiles.
Fixed a crash when
MAX(col) is selected
from an empty table, and
col is not the
first column in a multi-column index.
Fixed a bug in purge which could cause crashes.
This is a translation of the MySQL Reference Manual that can be found at dev.mysql.com. The original Reference Manual is in English, and this translation is not necessarily as up to date as the English version.