Search results
Results From The WOW.Com Content Network
The Access Method Services utility program IDCAMS is commonly used to manipulate ("delete and define") VSAM data sets. Custom programs can access VSAM datasets through Data Definition (DD) statements in Job Control Language (JCL), via dynamic allocation or in online regions such as in Customer Information Control System (CICS).
IDCAMS ("Access Method Services") generates and modifies Virtual Storage Access Method (VSAM) and Non-VSAM datasets. IDCAMS was introduced along with VSAM in OS/VS; the "Access Method" reference derives from the initial "VSAM replaces all other access methods" mindset of OS/VS. IDCAMS probably has the most functionality of all the utility ...
Job Control Language (JCL) is a scripting language used on IBM mainframe operating systems to instruct the system on how to run a batch job or start a subsystem. [1] The purpose of JCL is to say which programs to run, using which files or devices [2] for input or output, and at times to also indicate under what conditions to skip a step.
It shared most of the code base [4] and some manuals [5] [6] with IBM's DOS/360. TOS went through 14 releases, and was discontinued [ 7 ] [ failed verification ] when disks such as the IBM 2311 and IBM 2314 became more affordable at the time of System/360, [ 8 ] [ failed verification ] whereas they had been an expensive luxury on the IBM 7090 .
By design, programs written for MVS run on z/OS without modification. At first IBM described MVS as simply a new release of OS/VS2 , but it is, in fact a major rewrite. OS/VS2 release 1 is an upgrade of OS/360 MVT that retained most of the original code and, like MVT, is mainly written in assembly language .
ISAM was replaced at IBM with a methodology called VSAM (virtual storage access method). Still later, IBM developed SQL/DS and then Db2 which IBM promotes as their primary database management system. VSAM is the physical access method used in Db2. [citation needed]
Skip to main content
Basic Direct Access Method, or BDAM is an access method for IBM's OS/360 and successors computer operating systems on System/360 and later mainframes.BDAM "consists of routines used in retrieving data from, and storing data onto, direct access devices."