# 6.17. ODPI-C Enumeration dpiPurity

This enumeration identifies the purity of the sessions that are acquired when using connection classes during connection creation.

Value | Description
--- | ---
DPI_PURITY_DEFAULT | Default value used when creating connections.
DPI_PURITY_NEW | A connection is required that has not been tainted with any prior session state.
DPI_PURITY_SELF | A connection is permitted to have prior session state.