Event 54 occurs when a process is about to initiate a write of the last log page but discovers another process is already scheduled to perform write. The second process waits until the first process finishes its I/O, but the second process does not initiate the I/O operation.
Because Adaptive Server frequently updates the last page of the transaction log, Adaptive Server avoids performing physical writes of the last log page. This reduces the amount of I/O the server performs and increases the last log page’s availability to other processes that need to perform an update, and thereby impoving performance.
