7.00.02 - When Reference Data Does Not Fit in Memory - Aster Analytics

Teradata Aster® Analytics Foundation User GuideUpdate 2

Product
Aster Analytics
Release Number
7.00.02
Release Date
September 2017
Content Type
Programming Reference
User Guide
Publication ID
B700-1022-700K
Language
English (United States)

Use this syntax when neither input fits in memory. Partition the data by categorical attribute (for example, age range), thereby distributing the records to workers by the specified attribute and reducing the comparison times. If the categorical attribute has n values and each range has same size, the comparison times are reduced to 1/n.

Version 1.1
SELECT * FROM IdentityMatch (
  ON source_input_table AS a PARTITION BY key 
  ON reference_input_table AS b PARTITION BY key 
  IDColumn ('a.id_column: b.id_column')
  { NominalMatchColumns ('a.columnX: b.columnY' [,...]) |
    FuzzyMatchColumns ('a.columnX: b.columnY, match_metric,
      match_weight [, synonym_file ]' [,...]) }
  [ Accumulate ('{a|b}.accumulate_column' [,...]')]
  [ Threshold ('threshold') ]
);