关系数据库引擎

Relational database engine

以上为机器翻译结果，快速获取精准的人工翻译结果，建议选择有道人工翻译

1
主要的分别比基础设施的脚本是， MSI 安装引擎是一个关系数据库引擎。
The major difference compared to the script based installations is that the MSI installation engine is a relational database engine.
2
比如，最初曾经尝试将XML数据保存在关系数据库的varchar2字段中，然后简单地增加一个XQuery引擎层，结果查询性能很差。
For example, early attempts at storing XML data in varchar2 fields of a relational database resulted in poor query performance when an XQuery engine was simply layered on top.
3
基于ECA规则研究了引擎的运行控制规则，将ECA规则应用到关系数据库中实现了工作流引擎的控制逻辑。
Workflow runtime control rule is formulized in ECA rules and its application in database is researched to realize the control logic.

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