IBM An OS360 BDAM Users Guide Jun69 free download

File name An_OS360_BDAM_Users_Guide_Jun69.pdf

AN OS/360 BDAM USERS GUIDE Wayne E Fisher IBM Corporation Education Center 3424 Wilshire Blvd Los Angeles, Calif 90005 This paper is not intended to replace the IBM publications pertaining to BDAM. Rather it is intended to supplement, clarify, and bring together the BDAMmaterial in the .various IBM publications. It is assumed that the reader is familiar with the Assembly Language and the Supervisor and Data Management macro instructions. June 30, 1969 TABLE OF CONTENTS Introduction 1 Track Format Review 1 Blocks Versus Records 2 Programming Considerations 3 Formatting the Data Set Space 3 Addressing Schemes 3 Keys 3 Direct Addressing 4 Indirect Addressing 6 Overflow Record Handling 7 Record Reference Methods 9 Referencing a Specific Record 9 Referencing a Record with a Specific Key 11 Extended Search Option 12 Dynamic Buffering 13 Programming Considerations 13 Advantages Versus Disadvantages 13 Obtaining Buffers 14 Releasing Buffers 14 Feedback 14 Requesting Feedback 15 Storing Feedback 15 Form of Feedback 15 Exclusive Control 17 CHECK Macro Versus WAIT Macro 18 Errors 18 Space Allocation 19 Fixed Format Records 20 Creating a Direct Data Set 20 Formatting the DASD Space 20 The WRITE Macro 20 Return Codes 21 Test Completion of WRITE Operation 21 DCB Considerations 22 DD statement Considerations 22 Processing Format F Without Keys 23 To Retrieve 24 To Update 24 To Make Additions 25 DCB Considerations 25 Examples 27 Processing Format F With Keys 28 To Retrieve a Specified Block 29 To Retrieve a Block With a Specified Key 30 To Update a Specified Block. 31 To Update a Block With a Specified Key 32 To Make Additions 33 DCB Considerations 34