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

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.