The following limitations apply to use of MySQL on the Windows platform:
On Windows 32-bit platforms, it is not possible by default to use more than 2GB of RAM within a single process, including MySQL. This is because the physical address limit on Windows 32-bit is 4GB and the default setting within Windows is to split the virtual address space between kernel (2GB) and user/applications (2GB).
Some versions of Windows have a boot time setting to enable larger applications by reducing the kernel application. Alternatively, to use more than 2GB, use a 64-bit version of Windows.
File system aliases
MyISAM tables, you cannot use
aliases within Windows link to the data files on another
volume and then link back to the main MySQL
This facility is often used to move the data and index files
to a RAID or other fast solution, while retaining the main
.frm files in the default data
directory configured with the
Limited number of ports
Windows systems have about 4,000 ports available for client connections, and after a connection on a port closes, it takes two to four minutes before the port can be reused. In situations where clients connect to and disconnect from the server at a high rate, it is possible for all available ports to be used up before closed ports become available again. If this happens, the MySQL server appears to be unresponsive even though it is running. Note that ports may be used by other applications running on the machine as well, in which case the number of ports available to MySQL is lower.
For more information about this problem, see http://support.microsoft.com/default.aspx?scid=kb;en-us;196271.
DATA DIRECTORY and
DATA DIRECTORY option for
CREATE TABLE is supported on
Windows only for
InnoDB tables, as
described in Section 14.5.4, “Specifying the Location of a Tablespace”. For
MyISAM and other storage engines, the
DATA DIRECTORY and
DIRECTORY options for
TABLE are ignored on Windows and any other
platforms with a nonfunctional
You cannot drop a database that is in use by another session.
File names are not case sensitive on Windows, so MySQL database and table names are also not case sensitive on Windows. The only restriction is that database and table names must be specified using the same case throughout a given statement. See Section 9.2.2, “Identifier Case Sensitivity”.
Directory and file names
On Windows, MySQL Server supports only directory and file names that are compatible with the current ANSI code pages. For example, the following Japanese directory name will not work in the Western locale (code page 1252):
The same limitation applies to directory and file names
referred to in SQL statements, such as the data file path
\” path name separator
Path name components in Windows are separated by the
\” character, which is also
the escape character in MySQL. If you are using
SELECT ... INTO
OUTFILE, use Unix-style file names with
LOAD DATA INFILE 'C:/tmp/skr.txt' INTO TABLE skr;mysql>
SELECT * INTO OUTFILE 'C:/tmp/skr.txt' FROM skr;
Alternatively, you must double the
LOAD DATA INFILE 'C:\\tmp\\skr.txt' INTO TABLE skr;mysql>
SELECT * INTO OUTFILE 'C:\\tmp\\skr.txt' FROM skr;
Problems with pipes
Pipes do not work reliably from the Windows command-line
prompt. If the pipe includes the character
thinks that it has encountered end-of-file and aborts the
This is mainly a problem when you try to apply a binary log as follows:
binary_log_file| mysql --user=root
If you have a problem applying the log and suspect that it
is because of a
CHAR(24) character, you can use the
mysql --user=root --execute "source /tmp/bin.sql"
The latter command also can be used to reliably read in any SQL file that may contain binary data.