This tells me that I may have an inefficient accesspath, where DB2 reads more data than it should.
这就说明我可能有一个低效的访问路径,DB 2读取的数据比应该读取的数据更多。
2
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。
3
In addition, the database can have a better understanding of the state of the data it stores, and thereby can produce a more efficient and dynamic accesspath to the data.