文件名称：DB - Access Path Selection in a Relational DMS
文件大小：192KB
文件格式：ZIP
更新时间：2022-07-12 00:01:52
数据库 优化器
DB - Access Path Selection in a Relational Database Management System.pdf 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 ..