But in such an early time of native XML database, there hasn't formed any fixed standard. More or less, there are many problems in storage structure, query optimize, index mechanism and concurrency control etc.
但是，在原生XML数据库发展初期，至今还没有形成一个固定的模式规范，在存储结构、查询优化、索引机制和并发控制等方面都有着或多或少的问题。
参考来源 - 基于原生XML数据库的研究及引擎的实现·2,447,543篇论文数据，部分数据来源于NoteExpress
The paper introduces the steps of query process, gives the particular way of the query decomposition, and also analyses the query optimize method.
介绍了查询处理的步骤，给出了查询分解的具体方法，并对查询的优化问题进行研究分析。
The DB2 9.5 optimizer USES both type of indexes to optimize the queries and help selecting the best plan for query execution.
DB 2 9.5优化器使用两种类型的索引来优化查询，并帮助选择最佳的查询执行计划。
When the query is prepared, the database will analyze, compile and optimize it's plan for executing the query.
当查询准备好后，数据库将分析、编译和优化执行该查询的计划。
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