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You can create a user-specific option file named. Linux: The file /etc/my.cnf serves as a global option file used by all users. The standard option files are as follows:ġ.
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The following groups are read: mysql client.
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etc/my.cnf /etc/mysql/my.cnf /usr/etc/my.cnf ~/.my.cnf Default options are read from the following files in You can view option file lookup locations, the order in which they are read, and groups with options: The server might read multiple my.cnf or my.ini files from different locations. There is no single my.cnf or my.ini file. Standard files are different for Linux and Windows: MySQL server looks for files in standard locations. The mysql client uses options from boththe and groups, so it would use all three options shown. – show-warnings: Tells MySQL to show any current warnings after each statementģ. : Options in this group apply onlyto the mysql client. – compress: Directs the client/server protocol to use compression for traffic sent over the network.Ģ. : Options in this group apply to all standard clients. In the example shown above, note the following:ġ. This is not true for options specified on the command line. If an option takes a value, spaces are allowed around the equal ( = ) sign.Use the long option format, as used on the command line, but omit the leading dashes.The server itself needs only readaccess it reads option files but does not create or modify them. To create or modify an option file, the end user must have write permission for it. , , and : Used for specifying options to different server versions or startup methodsīelow is a brief example of groups in an option file:.: Used for specifying options that apply to both the mysqld and mysqld_safeserver programs.Other client options can also be specified individually. and : Used for specifying options that apply to mysql and mysqldumpclients, respectively.A common use for the group is to specify connection parameters, because typically connections are made to the same server no matter which client program is used. : Used for specifying options that apply to all client programs.Typically, the group name is the category or name of the program to which the group of options applies. Options in option files are organized into groups, with each group preceded by a line that names the group. To create or modify an option file, you must have write permission for it. To use an option file, create it as a plain text file by using an editor. No error occurs if a given file is not found. Programs look for each of the standard option files and read any that exist. MySQL programs can access options from multiple option files. If a single option file contains all server options, you can see how the server has been configured at a glance.This is more convenient and less error-prone for complex options, such as those used to configure the InnoDB tablespace. When you put options in a file, you do not need to specify them on the command line each time you start the server.However, it is more useful to list them in an option file, for several reasons: When you invoke the server from the command line, you can specify any of the server options listed with the –help option. Note: The preceding command provides information. Command-line options take precedence over any settings in an option file. You can specify runtime options when the server is started (to change its configuration and behavior) by using command-line options or an option file, or by using a combination of both. Enable or disable precompiled storage engines at server startup.Override the server’s built-in values for performance-related variables (that is, to control the maximum number of simultaneous connections and the sizes of buffers and caches).Control which log files the server writes.Specify the locations of important directories and files.However, if the default values are not suitable for your environment, add runtime options to tell the server to use different values to: MySQL client programs look for option files at startup and use appropriate options.īy default, the server uses precompiled values for its configuration variables when it runs.
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You can specify startup options on the command line when you invoke the server (or client), or in an option file.