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Key Data / Key-Score-Logic

You can use this approach to reduce the size of the candidate set.

Use

KEY-DATA

to append redundant information from the Data record to the key generated from

KEY-FIELD

. It is stored in the index. The additional information appended to the key is passed to a Score-Logic routine, which can then decide whether or not this particular record should be included in the candidate set.

Up to five fields from the Data record can be appended to the key. Refer to the

IDX-Definition’s KEY-DATA

parameter for the syntax.

A Score-Logic routine, which examines the

KEY-DATA

from the search and file records, can be provided in one of these forms:

a standard SSA-NAME3 matching logic enabled using

KEY-PRE-SCORE-LOGIC=

a standard SSA-NAME3 matching logic enabled using

KEY-SCORE-LOGIC=

Key-Pre-Score-Logic / Key-Score-Logic

The SSA-NAME3 matching logic is nominated using the Clustering-Definition’s

KEY-PRE-SCORE-LOGIC

KEY-SCORE-LOGIC

keywords.

The matching routine is called with the search and file records

KEY-DATA

fields. If the returned score is less than the limit defined for the scoring logic, the file record is rejected from the candidate set.

For example, to append the first two bytes of a postal-code field to the key and then score it using a SSA-NAME3 matching scheme, perform the following tasks:

Code the following definitions in

Clustering-Definition


KEY-SCORE-LOGIC=SSA,
System(default),
Population(test),
Controls ("PURPOSE=Fields MATCH_LEVEL=Conservative"),
Matching-Fields("post-code:Postal_Area")

Code the following definition in

IDX-Definition

KEY-DATA      = (POST-CODE,2,0)

Rename Saved Search

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User Guide

User Guide

Key Data / Key-Score-Logic

Key Data / Key-Score-Logic

Key-Pre-Score-Logic / Key-Score-Logic