VSAM

If you've been involved in any type of programming activity on an IBM mainframe computer, you've almost certainly worked with files supported by VSAM, the Virtual Storage Access Method. If so, you know that VSAM provides many features and options. For example, when you issue a DEFINE CLUSTER command to create a VSAM file, you can code about 30 different parameters that select various options for the file. And you can code most of those parameters at one, two, or three levels, with varying results. Although many of those parameters have default settings, those defaults are often inappropriate for many applications. As a result, it's crucial that programmers and analysts at all levels have a solid understanding of VSAM's facilites and how they are best used in a variety of situations.

Daca ati fost implicat in orice tip de activitate de programare pe un computer mainframe IBM, aproape sigur ati lucrat cu fisiere acceptate de VSAM, metoda de acces la stocarea virtuala. Daca da, stiti ca VSAM ofera multe caracteristici si optiuni.