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Using Homebrew, I install MariaDB. It installs fine, but where is the ibdata1 file stored?

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On M1 Mac, Homebrew installs files into the /opt/homebrew/ folder. So with MySQL/MariaDB installed by Homebrew, default data directory is /opt/homebrew/var/mysql/.

It contains all databases and ibdata1 and other files previously placed in /usr/local/var/mysql/.

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From your MySQL Command Prompt, after root login,

SELECT @@datadir; should reveal the folder name

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/usr/local/var/mysql is the default data directory for MariaDB.

It includes the ibdata1 file, log files, etc

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