# 6.5. ODPI-C Enumeration dpiDeqNavigation

This enumeration identifies the method used for determining which message is to be dequeued from a queue.

Value | Description
--- | ---
DPI_DEQ_NAV_FIRST_MSG | Retrieves the first available message that matches the search criteria. This resets the position to the beginning of the queue.
DPI_DEQ_NAV_NEXT_MSG | Retrieves the next available message that matches the search criteria. This is the default method.
DPI_DEQ_NAV_NEXT_TRANSACTION | Skips the remainder of the current transaction group (if any) and retrieves the first message of the next transaction group. This option can only be used if message grouping is enabled for the queue.