A database engine is a complex software system composed of various modules that work together to provide efficient and secure data storage and retrieval. These modules include Storage Engine, Query Processor, Transaction Manager, Concurrency Control, and Security Manager. Each module plays a crucial role in the overall functioning of the database engine, contributing to its performance, reliability, and data integrity.

This article delve quickly into the components of a database engine, focusing on the query processor, and storage engine parts.