MySQL 8.0 Release Notes
MySQL 8.0 Source Code Documentation
The procedure for starting a single MySQL server manually from
the command line is described in
Section 2.3.4.6, “Starting MySQL from the Windows Command Line”. To start multiple
servers this way, you can specify the appropriate options on the
command line or in an option file. It is more convenient to
place the options in an option file, but it is necessary to make
sure that each server gets its own set of options. To do this,
create an option file for each server and tell the server the
file name with a --defaults-file
option when you run it.
Suppose that you want to run one instance of
mysqld on port 3307 with a data directory of
C:\mydata1, and another instance on port
3308 with a data directory of C:\mydata2.
Use this procedure:
Make sure that each data directory exists, including its own copy of the
mysqldatabase that contains the grant tables.Create two option files. For example, create one file named
C:\my-opts1.cnfthat looks like this:[mysqld] datadir = C:/mydata1 port = 3307Create a second file named
C:\my-opts2.cnfthat looks like this:[mysqld] datadir = C:/mydata2 port = 3308Use the
--defaults-fileoption to start each server with its own option file:C:\> C:\mysql\bin\mysqld --defaults-file=C:\my-opts1.cnf C:\> C:\mysql\bin\mysqld --defaults-file=C:\my-opts2.cnfEach server starts in the foreground (no new prompt appears until the server exits later), so you need to issue those two commands in separate console windows.
To shut down the servers, connect to each using the appropriate port number:
C:\> C:\mysql\bin\mysqladmin --port=3307 --host=127.0.0.1 --user=root --password shutdown
C:\> C:\mysql\bin\mysqladmin --port=3308 --host=127.0.0.1 --user=root --password shutdown
Servers configured as just described permit clients to connect
over TCP/IP. If your version of Windows supports named pipes and
you also want to permit named-pipe connections, specify options
that enable the named pipe and specify its name. Each server
that supports named-pipe connections must use a unique pipe
name. For example, the C:\my-opts1.cnf file
might be written like this:
[mysqld]
datadir = C:/mydata1
port = 3307
enable-named-pipe
socket = mypipe1
Modify C:\my-opts2.cnf similarly for use by
the second server. Then start the servers as described
previously.
A similar procedure applies for servers that you want to permit
shared-memory connections. Enable such connections by starting
the server with the
shared_memory system variable
enabled and specify a unique shared-memory name for each server
by setting the
shared_memory_base_name system
variable.