ISAM
ISAM Acronym for indexed sequential access method. An access method for data files, supporting both sequential access and indexed access (see indexed file). Cobol contains facilities for defining files to be accessed in this way, and the access method is implemented by an ISAM utility package. See also VSAM.
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B-tree , VSAM Acronym for virtual storage access method. An access method for data files, supporting both sequential access and indexed access (see indexed fi… random access , random access
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ISAM