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VSAM Last modified: Thursday, June 06, 2002

Short for Virtual Storage Access Method, a file management system used on IBM mainframes. VSAM speeds up access to data in files by using an inverted index (called a B+tree) of all records added to each file. Many legacy software systems use VSAM to implement database systems (called data sets).

VSAM Capabilities and Limitations IBM page that describes some potential problems with using VSAM including file size limitations. WebCrawler help page This help page provides information on WebCrawler basic search tips and techniques, features, general help, and contacts.