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Using KSAM XL: 900 Series HP 3000 Computer SystemsChapter 1 Introduction |
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Table of Contents The Keyed Sequential Access Method (KSAM) is a method of organizing data records according to the content of key fields within the record. This method allows sequential processing of records without relying on the physical location of the record in the file. Every record in a KSAM file contains a primary key field. The content of this field determines the logical sequence of each record. Alternate keys offer different sequences for accessing the same records. KSAM XL is a KSAM file format that functions in the native mode (NM) environment of the MPE/iX operating system. It is a single file that consists of an index area that contains key indexes, and a data area that contains data records. A primary key and up to fifteen alternate keys can be defined for a KSAM XL file. Key values are arranged in ascending order based on the data type of the field.
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