Another of the most important functions of UDS/SQL is to ensure the consistency and integrity of data, especially when faults such as a system failure occur during a transaction process. During a restart, UDS/SQL synchronizes the data available in the databases to bring them up to a consistent state (database warm start).
A database warm start can also be performed separately for individual databases.
If the DBH is restarted without special configuration activities, an aborted independent DBH session is resumed in the same status as it was in before it was aborted. This is possible using the session log file (SLF), in which the DBH stores the DBH load parameters of the current configuration (see section “Session log file (SLF)”).
You can regulate the duration of the warm start using the load parameter WARMSTART. This parameter controls the rate at which the blocks of the log files are written back to the database from the buffer during live operation. WARMSTART=VERY-FAST writes the pages to the database very frequently, which significantly shortens the duration of a warm start.