data base program communication blockDB-PCB／VS,the program communication block that describes an application program's interface to a data base.One DB-PCB is required for each logical data base accessed by the application program.；在IBM的信息管理系统IMS／VS中,描述应用程序与数据库之间的接口的程序通信块。每一个由应用程序存取的逻辑数据库都需要一个数据库程序通信块。