What\'s the Difference Between \"init_connect\" and \"init-connect\" in MySQL Configuration Files?

Delving into MySQL Configuration File Sections

The MySQL configuration file, often known as my.ini, plays a pivotal role in managing the settings and behavior of the MySQL database server. This comprehensive guide will elucidate the various sections within this configuration file and shed light on the subtle difference between "init_connect" and "init-connect."

Optional Sections in My.ini File

The my.ini file comprises numerous optional sections that cater to specific aspects and clients of MySQL. These sections include:

• [mysql]: Configures the mysql command line client.
• [client]: Applies to all connecting clients, including the mysql command line client.
• [mysqld]: Configures the MySQL server.
• [mysqldump]: Customizes the mysqldump utility.

[mysql] vs. [client]

Although both the [mysql] and [client] sections refer to client-side settings, they play distinct roles. The [mysql] section specifically targets the mysql command line client, enabling you to set options exclusive to this client. On the other hand, the [client] section encompasses all connecting clients, ensuring consistent settings for all client interactions.

init_connect vs. init-connect

The presence of either an underscore (_) or a hyphen (-) in a configuration file parameter has contextual implications. In the case of init_connect and init-connect, the following holds true:

• init-connect: Utilized as a command line parameter, signifying an SQL statement executed upon successful connection to the server.
• init_connect: Specified as an options file parameter, denoting the same SQL statement executed upon successful connection.

This subtle distinction arises from the different usage contexts. Command line parameters are typically separated by hyphens, while options file parameters utilize underscores for clarity.

Further Insight into My.ini Sections

For an in-depth understanding of all my.ini sections and their respective options, refer to the official MySQL documentation: http://dev.mysql.com/doc/refman/5.5/en/option-files.html

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