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Teradata.Client.Provider
Stored Procedures With Output Parameters
.NET Data Provider for Teradata > Developer's Guide > Performance Considerations And Best Practices > Stored Procedures With Output Parameters

Teradata Database V2R6.0 and earlier required Output Parameter names as opposed to Parameter markers (question mark). Therefore .NET Data Provider for Teradata executes a HELP PROCEDURE statement when TdParameter.ParameterName is not specified by the application. This performance consideration is only applicable to Teradata Database V2R6.0 and earlier releases.