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.\"     Title: mysqld
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: 11/29/2021
.\"    Manual: MySQL Database System
.\"    Source: MySQL 5.7
.\"  Language: English
.\"
.TH "MYSQLD" "8" "11/29/2021" "MySQL 5\&.7" "MySQL Database System"
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.SH "NAME"
mysqld \- the MySQL server
.SH "SYNOPSIS"
.HP \w'\fBmysqld\ [\fR\fB\fIoptions\fR\fR\fB]\fR\ 'u
\fBmysqld [\fR\fB\fIoptions\fR\fR\fB]\fR
.SH "DESCRIPTION"
.PP
\fBmysqld\fR, 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 status files\&.
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\fBNote\fR
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.PP
Some installation packages contain a debugging version of the server named
\fBmysqld\-debug\fR\&. Invoke this version instead of
\fBmysqld\fR
for debugging support, memory allocation checking, and trace file support (see
Section\ \&5.8.1.2, \(lqCreating Trace Files\(rq)\&.
.sp .5v
.RE
.PP
When MySQL server starts, it listens for network connections from client programs and manages access to databases on behalf of those clients\&.
.PP
The
\fBmysqld\fR
program has many options that can be specified at startup\&. For a complete list of options, run this command:
.sp
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.nf
mysqld \-\-verbose \-\-help
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.PP
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\&.
.PP
For a full description of MySQL Server command options, system variables, and status variables, see
Section\ \&5.1, \(lqThe MySQL Server\(rq\&. For information about installing MySQL and setting up the initial configuration, see
Chapter\ \&2, Installing and Upgrading MySQL\&.
.SH "COPYRIGHT"
.br
.PP
Copyright \(co 1997, 2021, Oracle and/or its affiliates.
.PP
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.
.PP
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.
.PP
You should have received a copy of the GNU General Public License along with the program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or see http://www.gnu.org/licenses/.
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.SH "SEE ALSO"
For more information, please refer to the MySQL Reference Manual,
which may already be installed locally and which is also available
online at http://dev.mysql.com/doc/.
.SH AUTHOR
Oracle Corporation (http://dev.mysql.com/).