In a Sybase CEP Engine, each row contains a "row timestamp" that is used to help ensure that rows are processed in order.
If the row contains information about a particular event (such as a stock trade), the row timestamp is typically the date and time that the event occurred (such as the time that a stock trade was completed). Row timestamps are stored using the Sybase CEP TIMESTAMP data type, which means that the time information is stored with a precision of one microsecond.
Row timestamps are not necessarily unique. Two rows (in the same stream or in different streams) may have the same row timestamp.