1. In DPPX, a relative sequential data set that resides on the system residence volume and contains extensive data set, data space, and volume information. The DPPX Base uses the information to locate data sets and toverify the authority of a user to gain access to data sets in the data space controlled by the master catalog.; 在分布式處理程序設(shè)計(jì)執(zhí)行程序(DPPX)中,駐留 在系統(tǒng)常駐卷上的相關(guān)順序數(shù)據(jù)集,它含有廣泛的數(shù)據(jù)集、數(shù)據(jù)空間和卷信息。DPPX 操作系統(tǒng)數(shù)據(jù)庫使用這些信息為數(shù)據(jù)庫定位,并驗(yàn)證某個(gè)用戶是否有權(quán)存取主目錄控制下 的數(shù)據(jù)空間中的數(shù)據(jù)集。參閱VSAM master catalog。 2. A catalogue that is accessed as a step in locating other catalogues， a table of catalogues. | 一種在尋找［定位］其它一些目錄的過程中必須要訪問的目錄, 即一種許多目錄的表格。