Скачать или смотреть 1. What Is a DBMS?

The sources provide a foundational overview of Database Management Systems (DBMS), explaining that a Database System combines a database—an organized collection of data—with a DBMS, which is the software controlling its storage and retrieval. Communication with the database is primarily handled using Structured Query Language (SQL), which facilitates operations like searching and updating data. The documents detail the internal architecture of a database system, including components like the Query Processor (with its DDL Interpreter and DML Compiler) and the Storage Manager. Furthermore, the texts introduce the concept of Data Abstraction across three levels (External, Logical, and Physical) to hide complex storage details, and they conclude by describing Client/Server Architectures (Two-Tier and Three-Tier) as a method for organizing database systems for improved scalability and security.