Table of Contents

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  1. Preface
  2. Introduction to Data Validation Option
  3. New Features and Behavior Changes
  4. Repositories
  5. XML Data Source
  6. Tests for XML Data Sources
  7. Connections
  8. Expressions
  9. Table Pairs
  10. Tests for Table Pairs
  11. Single-Table Constraints
  12. Tests for Single-Table Constraints
  13. Examples of Tests from Spreadsheets
  14. SQL Views
  15. Lookup Views
  16. Join Views
  17. Aggregate Views
  18. Business Intelligence and Reporting Tools Reports
  19. Dashboards
  20. DVOCmd Command Line Program
  21. Troubleshooting
  22. Datatype Reference
  23. Reporting Views
  24. Metadata Import Syntax
  25. Jasper Reports
  26. Glossary

Data Validation Option User Guide

Data Validation Option User Guide

Rules and Guidelines for Data Sampling

Rules and Guidelines for Data Sampling

Certain rules and guidelines apply when you perform data sampling on a table pair.
Use the following rules and guidelines when you perform data sampling on a table pair:
  • The sample percentage that you specify may differ from the actual sample percentage during a test run. The sample percentage that you specify represents the chance that each data is included in the sample.
  • You cannot use native sampling if the underlying Oracle tables or views from which you are sampling do not have unique primary keys. Instead, use PowerCenter sampling.
  • If you run sampling on a table pair, you select one table to sample. In a master-detail relationship, sample the detail table because it is the bigger table. When you sample the bigger table, the joiner processes a smaller set of data. Table A is the master table and table B is the detail table.
  • Some tests might have different results based on whether you enable data sampling.