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  2. Mainframe sort merge - Wikipedia

    en.wikipedia.org/wiki/Mainframe_sort_merge

    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.

  3. Support programs for OS/360 and successors - Wikipedia

    en.wikipedia.org/wiki/Support_programs_for_OS/...

    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.

  4. Transaction Processing Facility - Wikipedia

    en.wikipedia.org/wiki/Transaction_Processing...

    In order to serialize accesses between data records on a loosely coupled system, a practice known as record locking must be used. This means that when one mainframe processor obtains a hold on a record, the mechanism must prevent all other processors from obtaining the same hold and communicate to the requesting processors that they are waiting.

  5. RCA Spectra 70 - Wikipedia

    en.wikipedia.org/wiki/RCA_Spectra_70

    TSOS was the first mainframe, demand paged, virtual memory operating system on the market. The Spectra series was later supplemented by the RCA Series (RCA 2, 3, 6, 7— later renamed the 70/2, 70/3, 70/6, and 70/7, [5] which competed against the IBM System/370.

  6. IBM System/360 - Wikipedia

    en.wikipedia.org/wiki/IBM_System/360

    The IBM System/360 (S/360) is a family of mainframe computer systems announced by IBM on April 7, 1964, [1] and delivered between 1965 and 1978. [2] System/360 was the first family of computers designed to cover both commercial and scientific applications and a complete range of applications from small to large.

  7. IBM System/370 - Wikipedia

    en.wikipedia.org/wiki/IBM_System/370

    The IBM System/370 (S/370) is a range of IBM mainframe computers announced as the successors to the System/360 family on June 30, 1970. The series mostly [b] maintains backward compatibility with the S/360, allowing an easy migration path for customers; this, plus improved performance, were the dominant themes of the product announcement.

  8. External sorting - Wikipedia

    en.wikipedia.org/wiki/External_sorting

    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 ...

  9. Batcher odd–even mergesort - Wikipedia

    en.wikipedia.org/wiki/Batcher_odd–even_mergesort

    Batcher's odd–even mergesort [1] is a generic construction devised by Ken Batcher for sorting networks of size O(n (log n) 2) and depth O((log n) 2), where n is the number of items to be sorted. Although it is not asymptotically optimal, Knuth concluded in 1998, with respect to the AKS network that "Batcher's method is much better, unless n ...