data base description (DBD)
In IMS/VS,the collection of macro parameter statements that describes an IMS/ VS data base. These statements describe the hierarchical structure, IMS/VS organization, device type, segment length, sequence fields, and alternate search fields. The statements are assembled to produce data base description blocks.; 在IBM的信息管理系統(tǒng)IMS/VS中,描述IMS/VS數(shù)據(jù)庫的宏參數(shù)語句的集合。這些語句描 述層次結(jié)構(gòu)、IMS/VS組織、設(shè)備類型、段長、順序字段和替換檢索字段。這些語句經(jīng)匯編 后產(chǎn)生數(shù)據(jù)庫描述塊。