Table of Contents

Search

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