本文主要研究分布式并行数据库的一致性机制，数据库的一致性机制是保证分布式并行数据库系统能正常提供数据库服务的基础。
This thesis mainly research the consistency mechanism of distributed and parallel database, the consistency mechanism of database system can provide user normal database service.
通过提供添加元数据时应该遵循的公共机制，保证了分类的一致性。
The classification provides consistency by offering a common mechanism through which metadata is added.
任何数据库管理系统都必须拥有确保数据一致性和可恢复性的机制。
Any database management system must have mechanisms for securing data consistency and recoverability.
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