在并行实时数据库中，并发控制协议不仅要满足数据库一致性约束，而且要满足时间约束。

In parallel realtime database systems, concurrency control protocols must not only maintain the consistency constraints, but also meet time constraints.

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GIS中事务约束规则对于保证数据库更新时数据的完整性和一致性具有重要的意义。

The transaction constraint rules are important for preserving the data integrity and consistency when the database is updated in a GIS.

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