We have used BDAM datasets accessed by block number as well as VSAM RRDS
datasets in a software product. They are equivalent and the advantages
of VSAM have been mentioned. However, although performance is not
usually a critical factor, it is only in the CICS environment that we
have seen a significant difference between using the two access
methods. CICS did not allow an existing VSAM record to be written
without a preceding read. Since CICS does allow this it for BDAM, our
I/O for writing a block is more efficient in BDAM.
On 2017-11-27 1:48 PM, Sudershan Ravi wrote:
Why BDAM files are infrequently used? what are the complexities we face when we
do Direct Access of a file.
Thanks,
Sudershan.
Gary Weinhold
Senior Application Architect
DATAKINETICS | Data Performance & Optimization
Phone +1.613.523.5500 x216
Email: [email protected]
Visit us online at www.DKL.com
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