In this chapter, we will present a brief introduction to the principles of database systems.
在这章中，我们将为大家简要介绍一下数据库系统的原理。
To make this happen, the 2-phase-commit protocol was invented (see Principles of Distributed Database systems in Resources) and is also implemented in various systems.
为确保这一点，两步提交协议(请参阅参考资料中的分布式数据库原理)被提出且在各种系统中实现。
Purpose: to master the basic concepts of database systems, principles and methods learn how to effectively use the database management system, including database design and database programming.
说明：目的：掌握数据库系统的基本概念、原理和方法；学会如何有效地使用数据库管理系统，包括数据库的设计和对数据库的编程。
Purpose: to master the basic concepts of database systems, principles and methods learn how to effectively use the database management system, including database design and database programming.
说明：目的：掌握数据库系统的基本概念、原理和方法；学会如何有效地使用数据库管理系统，包括数据库的设计和对数据库的编程。
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