Table of Contents

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  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. Appendix A: Datatype Reference
  22. Appendix B: Reporting Views
  23. Appendix C: Metadata Import Syntax
  24. Appendix D: Jasper Reports
  25. Appendix E: Glossary

Data Validation Option User Guide

Data Validation Option User Guide

Table Join Optimization

Table Join Optimization

When you include a large table in a joined table pair, you can increase performance of the table-pair tests.
Data Validation Option uses joins in VALUE and OUTER_VALUE tests. To run VALUE and OUTER_VALUE tests on a table pair, you must join the tables based on the related keys in each table.
By default, Data Validation Option joins the tables with an inner equijoin and sorts the rows in the table. The join condition uses the following
WHERE
clause syntax:
Table A.column_name = Table B.column_name
If one of the tables in a table pair contains a large volume of data compared to the other table, you can increase test performance by designating the larger table as the detail source and the smaller table as the master source. Select the smaller table as Table A and the larger table as Table B. When the PowerCenter Integration Service determines whether to join two records, it compares each row of the master source against the detail source.
To increase performance of a table pair with two large tables, sort the input. When you run tests on tables with sorted records, the PowerCenter Integration Service minimizes disk input and output.
To further increase performance for large relational tables, configure the table pair so that the database sorts the records.