The following is the sequence of events at Adaptive Server start-up:
System databases are recovered on engine 0.
Adaptive Server accepts user connections.
All engines that are configured to be online during start-up are brought online.
User databases are recovered in parallel by a “self-tuned” number of recovery tasks using the default data cache tuned for optimal recovery performance.
For more information about recovery-tuned parameters affecting the default data cache, see “Database recovery enhancements”. For more information about the number of recovery tasks, see “Parallel recovery”.
During an HA failover, failed over user databases are recovered and brought online in parallel. Fast recovery helps recovery from a planned or unplanned shutdowns, unplanned crashes, and HA failover.
