Types of Transaction Processing

You can process incoming transactions by comparing (or matching on) the following types of fields:

In MODIFY, a MATCH on a non-unique key in a segment with a unique key may retrieve more than one record instance. MATCH returns only the first instance of this answer set; subsequent sections demonstrate how to use NEXT to retrieve the remaining instances.

In Maintain, MATCH always matches on the unique key and retrieves at most one record instance. To match on a non-unique key in Maintain, you use the NEXT command without a prior MATCH. The Maintain implementation of the NEXT command fetches the entire answer set returned by Adabas directly into a stack. It also includes three optional phrases:

See the FOCUS Maintaining Databases manual for complete syntax.


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