文件名称：Access Path Selection in a Relational Database Management System
文件大小：218KB
文件格式：PDF
更新时间：2018-04-05 00:00:20
数据库论文
In a high level query and data manipulation language such as SQL, requests are stated non-procedurally, without reference to access paths. This paper describes how System R chooses access paths for both simple (single relation) and complex queries (such as joins), given a user specification of desired data as a boolean expression of predicates. System R is an experimental database management system developed to carry out research on the relational model of data. System R was designed and built by members of the IBM San Jose Research Laboratory.