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1. What is VSAM?


VSAM stands for virtual storage access method. VSAM is the file storage access method used in MVS, z/OS, and OS/390 version of operating systems. It is a file storage access method used in MVS that enables the multiple modules to share data without the overhead of hardware and software caches. It is also known as inter-module sharing or intercolocation memory. VSAM is one of the most widely used file storage technologies in mainframeKeywords: vsam interview questions, vsam/vramText: VSAM stands for virtual storage access method. VSAM is the file storage access method used in MVS, z/OS and OS/390 version of operating systems that enables the multiple modules to share data without the overhead of hardware and software caches. It is also known as inter-module sharing or intercolocation memory.It’s important to understand why we use VSAM technology when designing our applications, be it on server side (virtual machine) or client side (client). In this article we will look at what it means to “share” data between client and server side applications using workflow engines (VMware WorkSpaces).


2. How VSAM Works?


VSAM is a computer file storage method, which helps in organizing the data in the form of files in Mainframe computers. It is a file storage access method used in MVS, z/OS, and OS/390 version of operating systems. VSAM helps in organizing the data in the form of files in Mainframe computers.The term “VSAM” stands for “Virtual Storage Access Method”. VSAM was introduced by IBM in the 1970s. It is a file storage access method used in MVS, z/OS, and OS/390 version of operating systems. The reason why people refer to these as “vsams” is that they have menus on them rather than bookmarks like a conventional browser does. The software used to run these applications are called “Programmer’s Assistant” or “PA” for short.


3. Key Benefits of VSAM


VSAM is a file storage access method used in MVS, z/OS and OS/390 version of operating systems. The word VSAM is a combination of “Virtual Storage Access Method” and “Storage Access Method”.The VSAM is accessed by using file command or direct access to disk drive. It was first introduced in the 1970s by IBM to allow for the management of files on mainframes. The name VSAM is derived from the words “Virtual Storage Access Method” and “Storage Access Method”.The storage access method used in VSAM is different from other storage access methods like JFS (File Allocation Table) or NTFS (New Technology File System) because it uses direct disk access rather than indirect disk access as it does with NTFS or FFS (Filesystem) as it does with ZFS or UFS (Unified Filesystem).The advantages of VSAM are:1- It offers better performance than direct disk access to files on mainframe computers because it can handle larger data volumes faster.2- High availability; if there is a hardware failure, files can be recovered from a backup medium in case there was very little available space on that backup medium.3- It allows data to be stored in multiple locations without having to run read-, write-, update-, and delete-based operations, which significantly enhances performance and efficiency of mainframe computers while maintaining reliable service levels.4- Because data can be stored at different locations (on one computer), machine failures can be prevented so that the availability of data can be guaranteed even when there are no available processors on the system, which helps maintain lower costs for clients who purchase mainframe computer systems.5- Because it supports high availability—even if part of the system has been shut down for maintenance, recovery of data backed up to this system will restart all applications linked to this system and will not require changes in applications linked to any other part of the same system(s). This gives clients confidence that their applications will work even when one or more server processes have been shut down for maintenance or upgrades. This reliability improves business continuity as well as customer satisfaction because customers benefit from improved service levels while they are waiting between scheduled maintenance periods and upgrades occurring at intervals during their business lifetime, which may not occur with other storage access methods.” Source: http://www2.ibm.com/software/developmentlibrary/


4. How to Use a VSAM File?


VSAM is a file storage access method used in MVS, z/OS, and OS/390 version of operating systems. It is also known as “Virtual Storage Access Method” (VSAM). It helps in organizing the data in the form of files into Mainframe computers. VSAM files are accessed by addressing a file name to a memory location. The memory location is called as “address”, and the file is accessed by calling it “name”.The Memory Management Unit (MMU) controls the access rights of each device and determines whether an object can be accessed from multiple devices at once or from one device only. This control allows all devices to access any object stored at that address space without having to search for that object first.A typical VSAM file has two kinds of objects:1) The virtual storage manager (VSM) information about the physical storage device and its location within the computer’s main memory 2) The logical storage manager (LSM) information about which other files and directories are stored on which physical storage devices by each user, group, or domain 3) User-defined attributes associated with each object A VSAM can be divided into logical and physical models, which allow data management functions to be customized for different requirements. A VSAM consists of three layers: logical model, physical model, and user-defined attributes model.


5. Summary


VSAM stands for “Virtual Storage Access Method”. IBM introduced this in the 1970s. It is a file storage access method used in MVS, z/OS, and OS/390 version of operating systems. VSAM helps in organizing the data in the form of files in Mainframe computers. VSAM are accessed method used in operating systems such as MVS, z/OS and OS/390 that is a way to store information on disk or in other means. VSAM can be accessed through file system commands and stored into disk or other storage medium which can be read by software or hardware devices such as hard disk drives etc.The question you have to answer is:1) What are some advantages of VSAM?2) Can any computer store data with VSAM? How about a hard disk drive?3) What are some disadvantages of using VSAM?4) Is it an alternative to HDFS?5) Do you think that using VSAM will increase your usage of HDFS(HDFS)? Will it decrease your usage of HDFS(HDFS)? Answer these questions from your experience and knowledge about operating systems and mainframe computers too.

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Mainframe legacy systems still enjoy a dominant marketshare in enterprise IT. Technological advances have made mainframe systems ready for support from offsite locations. This express reference is written keeping in mind the need of mainframe professionals engaged in application enhancement, support and QA. All the topics are covered in a compressed summarized way, in question answer format suitable for interview preparation. A must for mainframer's career growth. Topics covered : COBOL,...

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The Mainframe Development Course : VSAM

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Last update was on: May 19, 2022 9:22 am

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Mainframe 5 Modules - TSO/ISPF, JCL , VSAM, SDSF, Z/OS-UNIX

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Last update was on: May 19, 2022 9:22 am

Learn Mainframe in a Simple way all 5 Important Modules in 1 Course - TSO/ISPF, JCL, VSAM SDSF , Z/OS UNIX

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