Optimized for one problem: By their nature, hierarchical databases optimized access to the data through one specific path.
针对单个问题的优化：本质上，层次数据库就通过一条指定的路径来优化数据访问。
The SQL compiler USES them to transform a statement into a more optimized form, thus improving the access path to the required data.
SQL编译器使用信息约束将语句转化成更优的形式，从而改善对所需数据的访问路径。
The work speed is optimized through the pipelining design, register matching or key path.
速度优化通过流水线设计、寄存器配平或关键路径实现。
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