Abstract: Method for generating an alternate logical database structure of a hierarchical database by a computing device, includes: determining a target level of a physical hierarchical database structure corresponding to a root level of a logical hierarchical database structure; accessing a current level of the physical hierarchical database structure equal to the target level; decrementing the current level by the computing device; accessing the decremented current level of the physical hierarchical database structure; and in response to determining that the decremented current level is a root level of the physical hierarchical database structure, repositioning the current level to the target level. In response to determining that the decremented current level is not the root level of the physical hierarchical database structure, repeating the decrementing of the current level and the accessing of the decremented current level of the physical hierarchical database structure by the computing device.

Abstract: A method for maintaining switchover between a backup and degrading active processor, which switchover is transparent to a terminal accessing the active processor with atomic transactions. The backup processor prepares for an outage by the active processor by synchronizing, tracking, and monitoring the active processor's log entries. When the active processor fails, the backup processor performs the necessary recovery processing and takes over user-transactions processing as the new active processor.