Virtual Storage Access Method. VSAM data sets may be accessed sequentially and randomly.
Virtual Storage Access Method. A file-oriented access method which provides for the definition and read/write usage of keyed, sequential and relative record files.
Virtual Sequential Access Method - A data access method used with IBM Mainframes running MVS, OS/390, z/OS and VSE/ESA operating systems. VSAM has been in use for over 30 years. The original VSAM had a 4-gigabyte limit for the size of data sets. IBM has enhanced VSAM to support record-level sharing and file sizes larger than 4 gigabytes. The current architectural limit varies according to the size of the data control intervals (CI's). For a 512-byte CI size, the maximum size is 2 terabytes; for a KSDS with a CI size of 32 kilobytes, the maximum size is 128 terabytes. For additional information about VSAM refer to http://www.simotime.com/indexsam.htm
Virtual Storage Access Method. VSAM is a file management system used on IBM mainframe computers.
Virtual Storage Access Method: A very fast random access file system for MVS that allows non-sequential retrieval of records based on the value of keys within them.
Virtual Storage Access Method. A legacy file management system for IBM mainframes, including OS/390, formerly known as MVS (Multiple Virtual Storage). VSAM creates an index for files in the order they are entered. VSAM can also access records according to a custom key, eg product ID. VSAM succeeded SAM and ISAM but VSAM itself is often replaced in mainframes by real RDBMSs such as DB2, Oracle, etc.
VSAM (Virtual Storage Access Method ) is a file management system for IBMs larger operating systems, including its primary mainframe operating system, MVS (Multiple Virtual Storage), now called OS/390. Using VSAM, an enterprise can create and access record in a file in the sequential order that they were entered.
IBM's access method for direct-access files. It is optimized for a virtual storage environment. Multiple Virtual Storage (MVS), Information Management System (IMS), Customer Information Control System (CICS) and DB2 all use VSAM. See DB2, CICS, IMS and MVS.
Virtual Sequential Access Method. An IBM disk file storage method which provides programs with random access to data.
Virtual Storage Access Method. An access method for direct or sequential processing of fixed and variable-length records on direct access devices. The records in a VSAM data set or file can be organized in logical sequence by a key field (key sequence), in the physical sequence in which they are written on the data set or file (entry-sequence), or by relative-record number.
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).