MYSQLD(8) MySQL Database System MYSQLD(8)
mysqld - the MySQL server
mysqld, also known as MySQL Server, is a single multithreaded program
that does most of the work in a MySQL installation. It does not spawn
additional processes. 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
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 126.96.36.199, "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:
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.
Copyright (C) 1997, 2023, Oracle and/or its affiliates.
This documentation is free software; you can redistribute it and/or
modify it only under the terms of the GNU General Public License as
published by the Free Software Foundation; version 2 of the License.
This documentation is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
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with the program; if not, write to the Free Software Foundation, Inc.,
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For more information, please refer to the MySQL Reference Manual, which
may already be installed locally and which is also available online at
Oracle Corporation (http://dev.mysql.com/).
MySQL 8.0 03/03/2023 MYSQLD(8)
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