Everything about Virtual Storage Access Method
IBM disk file programming interface
Virtual Storage Access Method (VSAM) 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. Originally a record-oriented filesystem, VSAM comprises four data set organizations: key-sequenced (KSDS), relative record (RRDS), entry-sequenced (ESDS) and linear (LDS). The KSDS, RRDS and ESDS organizations contain records, while the LDS organization contains a sequence of pages with no intrinsic record structure, for use as a memory-mapped file. Wikipedia →
🧭 Start here: a 6-step reading path
- Read the overview: Virtual Storage Access MethodA 5-minute orientation
- Pick up a classic book: American FilmThe most-reprinted book on the subject
- Go sideways: Indexed fileA closely related topic
- Go sideways: ISAMA closely related topic
📖 Definitions
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🗂️ The subject at a glance
🏆 Landmark papers (most cited)
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📚 Books worth reading
American FilmAmerican Film Institute · 1975
Invitation to Computer ScienceG. Michael Schneider, Judith L. Gersting · 1995
The web application hacker's handbookDafydd Stuttard, Marcus Pinto · 2007
The Conspirators HierarchyJohn Coleman · 1992
Treaty Occupationay ToxicologySuelen Queiroz · 2010
An introduction to data structures with applicationsJean-Paul Tremblay, Paul Gordon Sorenson · 1976
SystemVerilog for VerificationChris Spear · 2006
Pervasive Computing and the Networked WorldQiaohong Zu · 2013
Ranked by number of editions on Open Library, a rough measure of how lasting a book is.
🔗 Related topics
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- ISAM Indexed Sequential Access Method (ISAM) is a method for creating, maintaining, and manipulating computer files of data so that records can be retrieved…
- MVS Multiple Virtual Storage (MVS) is the most commonly used operating system on the System/370, System/390 and IBM Z IBM mainframe computers. IBM developed…
- OS/360 and successors OS/360, officially known as IBM System/360 Operating System, is a discontinued batch processing operating system developed by IBM for their then-new System/360…
- Access method An access method is a function of a mainframe operating system that enables access to data on disk, tape or other external devices. Access methods were…
- Direct-access storage device A direct-access storage device (DASD) (pronounced /ˈdæzdiː/) is a secondary storage device in which "each physical record has a discrete location and a…
- Data Facility Storage Management Subsystem (MVS) Data Facility Storage Management Subsystem (DFSMS) is a central component of IBM's flagship operating system z/OS. It includes access methods, utilities…
- Data set (IBM mainframe) In the context of IBM mainframe computers in the IBM System/360 line and its successors, a data set (IBM preferred) or dataset is a computer file having…