This section lists all the environment variables that are used directly or indirectly by MySQL. Most of these can also be found in other places in this manual.
Note that any options on the command line take precedence over values specified in option files and environment variables, and values in option files take precedence over values in environment variables.
In many cases, it is preferable to use an option file instead of environment variables to modify the behavior of MySQL. See Section 4.2.3.3, “Using Option Files”.
Variable | Description |
CXX |
The name of your C++ compiler (for running configure). |
CC |
The name of your C compiler (for running configure). |
CFLAGS |
Flags for your C compiler (for running configure). |
CXXFLAGS |
Flags for your C++ compiler (for running configure). |
DBI_USER |
The default user name for Perl DBI. |
DBI_TRACE |
Trace options for Perl DBI. |
HOME |
The default path for the mysql history file is
$HOME/.mysql_history . |
LD_RUN_PATH |
Used to specify the location of libmysqlclient.so . |
MYSQL_DEBUG |
Debug trace options when debugging. |
MYSQL_GROUP_SUFFIX |
Option group suffix value (like specifying
--defaults-group-suffix ). |
MYSQL_HISTFILE |
The path to the mysql history file. If this variable
is set, its value overrides the default for
$HOME/.mysql_history . |
MYSQL_HOME |
The path to the directory in which the server-specific
my.cnf file resides (as of MySQL
5.0.3). |
MYSQL_HOST |
The default host name used by the mysql command-line client. |
MYSQL_PS1 |
The command prompt to use in the mysql command-line client. |
MYSQL_PWD |
The default password when connecting to mysqld. Note that using this is insecure. See Section 5.3.2.2, “End-User Guidelines for Password Security”. |
MYSQL_TCP_PORT |
The default TCP/IP port number. |
MYSQL_UNIX_PORT |
The default Unix socket file name; used for connections to
localhost . |
PATH |
Used by the shell to find MySQL programs. |
TMPDIR |
The directory where temporary files are created. |
TZ |
This should be set to your local time zone. See Section B.5.4.6, “Time Zone Problems”. |
UMASK |
The user-file creation mode when creating files. See note following table. |
UMASK_DIR |
The user-directory creation mode when creating directories. See note following table. |
USER |
The default user name on Windows and NetWare used when connecting to mysqld. |
The UMASK
and UMASK_DIR
variables, despite their names, are used as modes, not masks:
If UMASK
is set, mysqld
uses ($UMASK | 0600)
as the mode for file
creation, so that newly created files have a mode in the range
from 0600 to 0666 (all values octal).
If UMASK_DIR
is set,
mysqld uses ($UMASK_DIR |
0700)
as the base mode for directory creation, which
then is AND-ed with ~(~$UMASK & 0666)
,
so that newly created directories have a mode in the range
from 0700 to 0777 (all values octal). The AND operation may
remove read and write permissions from the directory mode, but
not execute permissions.
MySQL assumes that the value for UMASK
or
UMASK_DIR
is in octal if it starts with a zero.
User Comments
Warning: Debian Backports is currently (as of 30th of July 2006) offering version 5.0.22-Debian_2bpo1-log which has a severe problem with handling the MYSQL_HISTFILE.
The manual-page says:
---8<---
On Unix, the mysql client writes a record of executed statements to a
history file. By default, the history file is named .mysql_history and
is created in your home directory. To specify a different file, set the
value of the MYSQL_HISTFILE environment variable.
If you do not want to maintain a history file, first remove
.mysql_history if it exists, and then use either of the following
techniques:
o Set the MYSQL_HISTFILE variable to /dev/null. To cause this setting
to take effect each time you log in, put the setting in one of your
shell's startup files.
o Create .mysql_history as a symbolic link to /dev/null:
shell> ln -s /dev/null $HOME/.mysql_history
You need do this only once.
--->8---
BOTH POSSIBILITIES ARE BROKEN! THEY BOTH DELETE /dev/null !!!
Be warned. I really mean it. A damaged /dev/null brakes your server.
Alex.
Resources:
http://www.bloglines.com/blog/ITnomad?id=125
Add your own comment.