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Which DB access method (OSAM or VSAM) is better and why?
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Answer Posted / john i harper
With IMS HALDBs, OSAM or VSAM can go to 40 terabytes, so
size is no longer a problem. However, OSAM was written by
IMS to do one thing, hold IMS data securely, and move it
quickly. VSAM was written to do many things, making the code
path longer. That increases the time needed to run, and
presents
a greater risk of failure.
Finally, OSAM is written and owned by IMS, so you only have
to ask one development team instead of two if you want any
new features added.
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