About the RDB High Water Mark Listener

The iWay Relational Database High Water Mark listener (RDBHWM) operates in real time to acquire newly inserted or updated rows from a relational data base. In order to identify the desired rows, a column (or concatenation of columns) must exist, which contains an increasing high water mark value.

The listener saves the highest high water mark value read with each SELECT, and constructs the subsequent query using the saved value. Unlike the RDBMS listener, no deletes or updates are necessary to prevent the rereading of processed rows. Because the RDBHWM listener can access the database as read-only, the performance of the RDBHWM listener is faster than the general RDBMS listener.


iWay Software