mysqld, also known as MySQL Server, is the main program that does most
of the work in a MySQL installation. MySQL Server manages access to the
MySQL data directory that contains databases and tables. The data
directory is also the default location for other information such as
log files and status files.
Some installation packages contain a debugging version of the
server named mysqld-debug. Invoke this version instead of mysqld
for debugging support, memory allocation checking, and trace file
support (see Section 18.104.22.168, "Creating Trace Files").
When MySQL server starts, it listens for network connections from
client programs and manages access to databases on behalf of those
The mysqld program has many options that can be specified at startup.
For a complete list of options, run this command:
shell> mysqld --verbose --help
MySQL Server also has a set of system variables that affect its
operation as it runs. System variables can be set at server startup,
and many of them can be changed at runtime to effect dynamic server
reconfiguration. MySQL Server also has a set of status variables that
provide information about its operation. You can monitor these status
variables to access runtime performance characteristics.
For a full description of MySQL Server command options, system
variables, and status variables, see Section 5.1, "The MySQL Server".
For information about installing MySQL and setting up the initial
configuration, see Chapter 2, Installing and Upgrading MySQL.
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