IBM GC26-3746-1 OS Data Management Services Guide Rel 21 Feb72 free download

File name GC26-3746-1_OS_Data_Management_Services_Guide_Rel_21_Feb72.pdf

File Number S360-30 Order Number GC26-3746-1 Systems Reference Library OS Data Management Services Guide Release 21 This book describes the services provided by the operating system to allow the programmer to organize data into data sets on auxiliary storage devices, to read. information from these data sets into main storage, and, after processing the information, to record it on auxiliary storage devices. This book is intended for application programmers who write assembler-language programs that create and process data sets. It describes the assembler-language macro instructions used to request input and output operations. The format of the macro instructions is explained in as Data Management Macro Instructions, GC26-3794, which should be used with this book. In addition to describing the characteristics of data sets and direct-access storage devices, the book describes the techniques you can use to process sequential, partitioned, indexed sequential, and direct data sets. This book assumes you have a basic knowledge of the operating system and of assembler language. Two books that contain information al?out these subjects are as Introduction, GC28-6534, and as Assembler Language, GC28-6514. It also assumes you are familiar with job control language, especially the DD statement, as described in as Job Control Language Reference, GC28-6704. This book does not discuss macro instructions used for the time sharing option or for graphics, teleprocessing, optical character readers, optical reader-sorters, or magnetic character readers. ~ These macro instructions are discussed in separate publications that are listed in the IBM System/360 and System/370 Bibliography, ... : GA22-6822. ~" 4 ...