Table of Contents

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  1. Preface
  2. Working with Transformations
  3. Aggregator Transformation
  4. Custom Transformation
  5. Custom Transformation Functions
  6. Data Masking Transformation
  7. Data Masking Examples
  8. Expression Transformation
  9. External Procedure Transformation
  10. Filter Transformation
  11. HTTP Transformation
  12. Identity Resolution Transformation
  13. Java Transformation
  14. Java Transformation API Reference
  15. Java Expressions
  16. Java Transformation Example
  17. Joiner Transformation
  18. Lookup Transformation
  19. Lookup Caches
  20. Dynamic Lookup Cache
  21. Normalizer Transformation
  22. Rank Transformation
  23. Router Transformation
  24. Sequence Generator Transformation
  25. Sorter Transformation
  26. Source Qualifier Transformation
  27. SQL Transformation
  28. Using the SQL Transformation in a Mapping
  29. Stored Procedure Transformation
  30. Transaction Control Transformation
  31. Union Transformation
  32. Unstructured Data Transformation
  33. Update Strategy Transformation
  34. XML Transformations

Transformation Guide

Transformation Guide

Storage Tables

Storage Tables

The Data Masking transformation maintains storage tables for repeatable substitution between sessions. A storage table row contains the source column and a masked value pair. Each time the Data Masking transformation masks a value with a repeatable substitute value, it searches the storage table by dictionary name, locale, column name, input value, and seed. If it finds a row, it returns the masked value from the storage table. If the Data Masking transformation does not find a row, it retrieves a row from the dictionary with a hash key.
The dictionary name format in the storage table is different for a flat file dictionary and a relational dictionary. A flat file dictionary name is identified by the file name. The relational dictionary name has the following syntax:
<Connection object>_<dictionary table name>
Informatica provides scripts that you can run to create a relational storage table. The scripts are in the following location:
<PowerCenter Client installation directory>\client\bin\Extensions\DataMasking
The directory contains a script for Sybase, Microsoft SQL Server, IBM DB2, and Oracle databases. Each script is named Substitution_<database type>. You can create a table in a different database if you configure the SQL statements and the primary key constraints.
You need to encrypt storage tables for substitution masking when you have unencrypted data in the storage and use the same seed value and dictionary to encrypt the same columns.

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