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10.11 Setting the Error Message Language

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By default, mysqld produces error messages in English, but they can be displayed instead in any of several other languages: Czech, Danish, Dutch, Estonian, French, German, Greek, Hungarian, Italian, Japanese, Korean, Norwegian, Norwegian-ny, Polish, Portuguese, Romanian, Russian, Slovak, Spanish, or Swedish. This applies to messages the server writes to the error log and sends to clients.

To select the language in which the server writes error messages, follow the instructions in this section. For information about changing the character set for error messages (rather than the language), see Section 10.6, “Error Message Character Set”. For general information about configuring error logging, see Section 5.4.2, “The Error Log”.

The server searches for the error message file using these rules:

  • It looks for the file in a directory constructed from two system variable values, lc_messages_dir and lc_messages, with the latter converted to a language name. Suppose that you start the server using this command: 

    mysqld --lc_messages_dir=/usr/share/mysql --lc_messages=fr_FR

    In this case, mysqld maps the locale fr_FR to the language french and looks for the error file in the /usr/share/mysql/french directory.

    By default, the language files are located in the share/mysql/LANGUAGE directory under the MySQL base directory.

  • If the message file cannot be found in the directory constructed as just described, the server ignores the lc_messages value and uses only the lc_messages_dir value as the location in which to look.

  • If the server cannot find the configured message file, it writes a message to the error log to indicate the problem and defaults to built-in English messages.

The lc_messages_dir system variable can be set only at server startup and has only a global read-only value at runtime. lc_messages can be set at server startup and has global and session values that can be modified at runtime. Thus, the error message language can be changed while the server is running, and each client can have its own error message language by setting its session lc_messages value to the desired locale name. For example, if the server is using the fr_FR locale for error messages, a client can execute this statement to receive error messages in English:

  1. SET lc_messages = 'en_US';

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Document created the 26/06/2006, last modified the 26/10/2018
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