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Most of us query databases every day without thinking about what happens under the hood.
Here’s a clean breakdown of the five core components that almost every storage engine relies on:
Transaction manager
Lock manager
Access layer (CRUD)
Buffer manager
Recovery manager
Understanding how these pieces interact helps a lot when you’re debugging slow queries, lock contention, or recovery issues.
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A high-level breakdown of the five core components found in most database storage engines: transaction manager, lock manager, access layer (CRUD), buffer manager, and recovery manager. Understanding how these components interact is useful when debugging slow queries, lock contention, or recovery issues.

Database storage engines — the parts we rarely think about