A WHERE clause filters the records processed by all tests in a single table or table pair. The PowerCenter Integration Service and some data sources can process WHERE clauses.
A relational, Salesforce, SAP, or SAS data source can process the WHERE clause. Configure the data source to process the WHERE clause to reduce the number of rows that the PowerCenter Integration Service reads when it runs a Data Validation Option test. For example, Table A contains information about all U.S. customers. You want to test data for California customers only. In the table pair definition, you enter the WHERE clause
STATE = 'CA'
.
If the PowerCenter Integration Service processes the WHERE clause, the PowerCenter Integration Service reads all U.S. customers, and then applies a filter to the records that were read. If the data source processes the WHERE clause, the data source filters the customer records before the PowerCenter Integration Service reads the records. The test may run faster because the PowerCenter Integration Service reads a subset of the data.