- MySQL 5.1 Reference Manual :: 2 Installing and Upgrading MySQL :: 2.14 Environment Variables
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- MySQL 5.1 Reference Manual
- Preface, Notes, Licenses
- 1 General Information
- 2 Installing and Upgrading MySQL
- 3 Tutorial
- 4 MySQL Programs
- 5 MySQL Server Administration
- 6 Backup and Recovery
- 7 Optimization
- 8 Language Structure
- 9 Internationalization and Localization
- 10 Data Types
- 11 Functions and Operators
- 12 SQL Statement Syntax
- 13 Storage Engines
- 14 High Availability and Scalability
- 15 MySQL Enterprise Monitor
- 16 Replication
- 17 MySQL Cluster NDB 6.X/7.X
- 18 Partitioning
- 19 Stored Programs and Views
- 20 INFORMATION_SCHEMA Tables
- 21 Connectors and APIs
- 22 Extending MySQL
- A MySQL 5.1 Frequently Asked Questions
- B Errors, Error Codes, and Common Problems
- C MySQL Change History
- D Restrictions and Limits
- Index
- Standard Index
- C Function Index
- Command Index
- Function Index
- INFORMATION_SCHEMA Index
- Transaction Isolation Level Index
- JOIN Types Index
- Operator Index
- Option Index
- Privileges Index
- SQL Modes Index
- Status Variable Index
- Statement/Syntax Index
- System Variable Index
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 CXXThe name of your C++ compiler (for running configure). CCThe name of your C compiler (for running configure). CFLAGSFlags for your C compiler (for running configure). CXXFLAGSFlags for your C++ compiler (for running configure). DBI_USERThe default user name for Perl DBI. DBI_TRACETrace options for Perl DBI. HOMEThe default path for the mysql history file is $HOME/.mysql_history.LD_RUN_PATHUsed to specify the location of libmysqlclient.so.MYSQL_DEBUGDebug trace options when debugging. MYSQL_GROUP_SUFFIXOption group suffix value (like specifying --defaults-group-suffix).MYSQL_HISTFILEThe path to the mysql history file. If this variable is set, its value overrides the default for $HOME/.mysql_history.MYSQL_HOMEThe path to the directory in which the server-specific my.cnffile resides (as of MySQL 5.0.3).MYSQL_HOSTThe default host name used by the mysql command-line client. MYSQL_PS1The command prompt to use in the mysql command-line client. MYSQL_PWDThe default password when connecting to mysqld. Note that using this is insecure. See Section 5.3.2.2, “End-User Guidelines for Password Security”. MYSQL_TCP_PORTThe default TCP/IP port number. MYSQL_UNIX_PORTThe default Unix socket file name; used for connections to localhost.PATHUsed by the shell to find MySQL programs. TMPDIRThe directory where temporary files are created. TZThis should be set to your local time zone. See Section B.5.4.6, “Time Zone Problems”. UMASKThe user-file creation mode when creating files. See note following table. UMASK_DIRThe user-directory creation mode when creating directories. See note following table. USERThe default user name on Windows and NetWare used when connecting to mysqld. The
UMASKandUMASK_DIRvariables, despite their names, are used as modes, not masks:If
UMASKis set, mysqld uses($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_DIRis 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
UMASKorUMASK_DIRis in octal if it starts with a zero.