what is the use of aix in vsam why do we go for aix and wht
is build index in vsam?
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Answer Posted / codebulls
At times a vendor might offer a file to be consumed by a mainframe application. Rather than the primary key, the file would contain another field in the VSAM which is unique but not the primary key of VSAM. If such fields are made to be Alternate Index, unnecessary reads and performance overhead can be avoided.
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Yes. Because the alternate key would first locate the primary key, which in turn locates the actual record. Needs twice the number of I/Os.
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