In VSAM, an alternate index is a structure that allows you to access data in an existing KSDS or ESDS data set by using an alternate symbolic key. Alternate keys may be nonunique; the alternate key and prime key can overlap. The combination of an alternate index and its base KSDS or ESDS data set is known as a PATH.
A VSAM alternate index may or may not be a member of the UPGRADE set for the base KSDS or ESDS. VSAM automatically maintains the index if it is a member of this set.
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