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How to set up multiple data directories in MySQL?
5.8.1 Setting Up Multiple Data Directories Each MySQL Instance on a machine should have its own data directory. The location is specified using the –datadir= dir_name option. There are different methods of setting up a data directory for a new instance:
How to set up multiple instances of MySQL?
After an installation has been performed using an MSI package, the template data directory can be copied to set up additional MySQL instances. With this method, any MySQL accounts or user data present in the data directory are carried over to the new data directory.
How to stop the existing MySQL instance using the data directory?
Stop the existing MySQL instance using the data directory. This must be a clean shutdown so that the instance flushes any pending changes to disk. Copy the data directory to the location where the new data directory should be. Copy the my.cnf or my.ini option file used by the existing instance.
Can you run multiple servers using the same data directory?
If (despite this warning) you run multiple servers using the same data directory and they have logging enabled, you must use the appropriate options to specify log file names that are unique to each server. Otherwise, the servers try to log to the same files.
For methods of configuring each instance with its own data directory, and warnings about the dangers of failing to do so, see Section 5.8.1, “Setting Up Multiple Data Directories” . In addition to using different data directories, several other options must have different values for each server instance:
Is it possible to run multiple instances of MySQL?
It is possible to use a different MySQL server binary per instance, or use the same binary for multiple instances, or any combination of the two approaches. For example, you might run a server from MySQL 5.6 and one from MySQL 5.7, to see how different versions handle a given workload.
What to do if you have multiple MySQL installations?
If you have multiple MySQL installations in different locations, you can specify the base directory for each installation with the –basedir= dir_name option. This causes each instance to automatically use a different data directory, log files,…
This option is used only on Windows. It designates the shared-memory name used by a Windows server to permit clients to connect using shared memory. It is necessary to specify distinct shared-memory names only for those servers configured to permit shared-memory connections.