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Fixed and VariableLength Logical Records
DATA STORAGE DEVICES
3 other sections not shown
Alpha Characters bytes Chapter Characters Character String Characters Gross Pay Characters No Yes COBOL context and data control unit DASD data element NAME data independence data management system data organization data representation Data Storage Devices data structures data values Decimal Digits deﬁned Dept 2 Characters direct address Disk Operating System Employee Dept EMPLOYEE NUMBER encoding entities example Exclusive Control field ﬁle ﬁnd ﬁrst stored record ﬁxed ﬁxed-length hierarchy I/O device IBM System/360 identiﬁed infomiation information attributes information system job step Job Title Jones key value kkkkkk kkkkkk kkkkkk length logical record magnetic tape main storage Manno 7 Characters Name 20 Characters Number Name Number Operating System Payroll Personnel physical blocks physical records PL/I processing relationship request retrieve Salary semester sequential organization shown in Figure simple list Smith storage address storage device stored record contains synonym system administrator technique updating User problem program user’s