Understanding MySQL Physical Files: System, Log, Replication, and Data Files Explained
This article outlines the four main types of MySQL physical files—system, log, replication, and data files—detailing their purposes and showing visual examples to help database administrators manage storage effectively and ensure optimal performance.
MySQL physical files consist of four categories:
1. System Files
These files contain the core MySQL server binaries and configuration data required for the database engine to operate.
2. Log Files
Log files record transaction history, error messages, and other runtime information, enabling recovery and troubleshooting.
3. Replication Files
These files are used for MySQL replication, storing binary logs and other data needed to synchronize master and slave servers.
4. Data Files
Data files hold the actual table data, indexes, and other user‑defined information stored in the database.
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