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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).

Related Categories

Databases

File Management
Related Terms

file management system

journaled file system

legacy application

mainframe

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VSAM Capabilities and Limitations
IBM page that describes some potential problems with using VSAM including file size limitations.

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