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The Sort/Merge utility is a mainframe program to sort records in a file into a specified order, merge pre-sorted files into a sorted file, or copy selected records. Internally, these utilities use one or more of the standard sorting algorithms , often with proprietary fine-tuned code.
The operation of SORT is directed by control statements, which are largely compatible among various IBM and third-party sort programs. The SORT or MERGE statement defines the sort keys— the fields on which the data is to be sorted or merged. This statement identifies the position, length, and data type of each key.
In IBM mainframe operating systems, such as OS/360, MVS, z/OS, a Data Control Block (DCB) is a description of a dataset in a program. A DCB is coded in Assembler programs using the DCB macro instruction (which expands into a large number of "define constant" instructions). High level language programmers use library routines containing DCBs.
CHAIN retrieves the record in the indexed file named in Factor 2 that matches the exact key specified by the value in Factor 1. SETLL causes the index pointer for the file named in Factor 2 to be positioned at the location specified by the value in Factor 1. SORTA causes the named array to be sorted in place; that is, the elements appear in order.
External sorting algorithms generally fall into two types, distribution sorting, which resembles quicksort, and external merge sort, which resembles merge sort. External merge sort typically uses a hybrid sort-merge strategy. In the sorting phase, chunks of data small enough to fit in main memory are read, sorted, and written out to a temporary ...
Software for this model did not include an operating system—the RCA 70/15 Programming System consisted of an "Assembly System, Loader Routines, Input-Output Control, Test Routines, Utility Routines, Communication Control, System Maintenance Routines, Report Program Generator, and Sort/Merge." Sort/Merge required a system with 8 KB of memory.
Enterprise COBOL Value Unit Edition for z/OS is the same as Enterprise COBOL for z/OS made available under a different product number and pricing metric. Check the lifecycle details (lifecycle dates, announcement letters, and other information) for Enterprise COBOL for z/OS products.
CPCS is run on IBM System/360 and later IBM mainframe computers and receives the data from the document processor and can store information from the cheques, including the bank number, branch number, account number and the amount the check was written for, as well as internal transaction codes. [11] IBM withdrew CPCS from marketing on Nov 29 ...