# 6.1. ODPI-C Enumeration dpiAuthMode

This enumeration identifies the mode to use when authorizing connections to the database.

Value | Description
--- | ---
DPI_MODE_AUTH_DEFAULT | Default value used when creating connections.
DPI_MODE_AUTH_PRELIM | Used together with DPI_MODE_AUTH_SYSDBA or DPI_MODE_AUTH_SYSOPER to authenticate for certain administrative tasks (such as starting up or shutting down the database).
DPI_MODE_AUTH_SYSASM | Authenticates with SYSASM access. The use of this value requires Oracle Client 12.1 or higher.
DPI_MODE_AUTH_SYSBKP | Authenticates with SYSBACKUP access. The use of this value requires Oracle Client 12.1 or higher.
DPI_MODE_AUTH_SYSDBA | Authenticates with SYSDBA access.
DPI_MODE_AUTH_SYSDGD | Authenticates with SYSDG access. The use of this value requires Oracle Client 12.1 or higher.
DPI_MODE_AUTH_SYSKMT | Authenticates with SYSKM access. The use of this value requires Oracle Client 12.1 or higher.
DPI_MODE_AUTH_SYSOPER | Authenticates with SYSOPER access.
DPI_MODE_AUTH_SYSRAC | Authenticates with SYSRAC access. The use of this value requires Oracle Client 12.2 or higher.