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If the return code of the vsam directory on your system is 184, this article should help.
Welcome to the real VSAM tutorial!!!
This tutorial will definitely take you from absolute level to beginner, so the following tutorial is also a combination – “VSAM Tutorial for Beginners” and “Advanced level”. VSAM Tutorial”.
Most affiliated schools charge you a minimum of $100 for VSAM training, but you can take the full VSAM Tutorial for free.
Browse VSAM Files
- VSAM is an acronym for Virtual for Storage Access Method.
- VSAM files are datasets that are NOT sequential files.
- Virtual Storage Access Method is IBM DASD file storage method.
- The records in a VSAM file can be either fixed or variable length.
When Should I Choose A VSAM File In Addition To A Normal Batch File?
- If users want to perform multiple operations on a file based on a specific key value, then you should select a VSAM file.
- If you want to update a specific record, in most cases important, or if you want to delete your files as a normal attempt, choose VSAM file access (virtual storage method) rather than sequential file if you are going to do variable file operations.
- VSAM files, however, are much more advanced and powerful compared to ordinary follower.
- You will probably only access serial transfer records in sequential order, but a human can access records, most often with VSAM files. your requirement. You can use entries either sequentially with this key, or dynamically in the case of VSAM files. There are
- there are several types of VSAM files, and you can find the VSAM file according to your needs.
- If it is simple operations, choose to read the file, write the end result to SPOOL (Simultaneous Operations Peripheral Online) or perhaps an output device, then you can take full advantage of sequential files, but let’s say you need a file where you need to edit the contents of that file regularly, and in fact, several operations are required, such as various search methods, etc., you can use VSAM files.
- If your file has a unique key value, you can start with that key value to get records. You can access registers using primary keys or even selection keys .
- If you need to frequently update, insert, or delete records, a later VSAM is a better option if it is next in file order. abandoned.
- If you want to access the file directly, IPSF 3. Then 4 runtime options, VSAM is simply not the best choice.
- You’ve seen this also cause performance issues , maybe the reason.
Key Points Related To The VSAM File
- It appears you cannot directly change the use of a VSAM ISPF file, or the use of the 3.4 option associated with TSO/ISPF.
- VSAM files cannot access results stored on tape, but have accessing data from or to some form of Direct Access Device Storage (DASD).
- Records will likely be accessed in multiple ways if you want the order to be consistent, or you can use records later in explicitorder using a top secret primary or secondary, or you can also access the records randomly, or sometimes you can also access the microfilm by RRN (Relative Record Number).
What Will You Learn From This Guide?
The Complete Guide to VSAM
Learn what vsam storage (virtual access method) is.
When you should use VSAM
We begin to introduce you to VSAM applications at all advanced levels.
Experience with Data VSAM Index Component
You will learn the index component and personal information of all VSAM files.
How do I access a number using an alternate key?
How do I clean up an alternate index file ?
Main functions of a VSAM file
Can you change the properties of a VSAM file?
We’ll show you how to print the records
- Anyone who is new to mainframes and has a basic knowledge of TSO/ISPF can easily follow this unique tutorial.
- A student or learner should have a basic knowledge of JCL (Job of Control Language).
- Having a basic knowledge of COBOL is an advantage when learning VSAM, but is not required.