Alternate Index

What is the use of Alternate Index? Is using alternate index in file processing fast ?

dtiwar
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Sep 27th, 2011
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surendhar

Nov 13th, 2011

Alternate index is used to access a vsam file by using alternate key.file processing is very fast.

MF Learner

Dec 8th, 2011

Alternate Index is used to access the records from the file using alternate key, when there is no primary key avaliable. But using this index accessing the records is slow. Because, alternate index format is Alternate key and primary key. So by using alternate key we will get primary key from the Alternate Index file, from there we will search the file using the primary key. Using Alternate Index the accessing is slow.