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  2. Entry-sequenced data set - Wikipedia

    en.wikipedia.org/wiki/Entry-sequenced_data_set

    An entry-sequenced data set (ESDS) is a type of data set used by IBM's VSAM computer data storage system. [1]: 5 Records are accessed based on their sequential order, that is, the order in which they were written to the file; which means that accessing a particular record involves searching all the records sequentially until it is located, or by using a relative physical address (Relative byte ...

  3. Virtual Storage Access Method - Wikipedia

    en.wikipedia.org/wiki/Virtual_storage_access_method

    Virtual Storage Access Method (VSAM) [1] is an IBM direct-access storage device (DASD) file storage access method, first used in the OS/VS1, OS/VS2 Release 1 (SVS) and Release 2 (MVS) operating systems, later used throughout the Multiple Virtual Storage (MVS) architecture and now in z/OS.

  4. OS/360 and successors - Wikipedia

    en.wikipedia.org/wiki/OS/360_and_successors

    These VSAM formats became the basis of IBM's database management systems, IMS/VS and DB2 - usually ESDS for the actual data storage and KSDS for indexes. VSAM also provides a new implementation of the catalog facility which enables applications to access files by name, without needing to know which disk drive(s) they are on.

  5. MVS - Wikipedia

    en.wikipedia.org/wiki/MVS

    VSAM also included a catalog component used for user catalogs and MVS' master catalog. Partitioned data sets (PDS) are sequential data sets subdivided into "members" that could each be processed as sequential files in their own right (like a folder in a file system). The most important use of PDSes was for program libraries - system ...

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  8. Key-sequenced data set - Wikipedia

    en.wikipedia.org/wiki/Key-sequenced_data_set

    A key-sequenced data set (KSDS) is a type of data set used by IBM's VSAM computer data storage system. [ 1 ] : 5 Each record in a KSDS data file is embedded with a unique key. [ 1 ] : 20 A KSDS consists of two parts, the data component and a separate index file known as the index component which allows the system to physically locate the record ...

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    In Blake Lively’s bombshell sexual harassment complaint against Justin Baldoni, the fixers are now part of the problem. On top of the laundry list of accused misconduct on the set of the film ...