Recovery in Parallel Database Systems by Svein-Olaf Hvasshovd (auth.)

By Svein-Olaf Hvasshovd (auth.)

Dr.-Ing. Svein-Olaf Hvasshovd wurde 1954 in Norwegen geboren. Er ist forschender Wissenschaftler bei SINTEF, DELAB in Tronheim, Norwegen.

Dr. Ing. Svein-Olaf Hvasshovd, born 1954 in Kongsberg, Norway, is operating as learn Scientist in Trondheim, Norway.

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Providing an in-place update policy. A recoverable non-atomic propagation alternative is the combination of an in-place update policy and a WAL log policy. This alternative will need recovery work done during restart since the stable DB may reflect an inconsistent state. )lementation policies. The main advantage of the atomic propagation policies is their very simple recovery logic due to the fact that the DB represents a consistent state when restart is initiated after a node failure. If propagation is connected to every transaction commit, the DB is consistent at restart.

6, with the emphasis on locking, overhead and bottlenecks during normal processing, transaction recovery speed, and node crash recovery speed. 1). The block oriented recovery approacb is the oldest of the recovery approaches analysed. It represents the state ofthe art from the late 1970s. It is also the recovery approach that least meets the HypRa design goals with respect to locking, low overhead, and no bottlenecks during normal processing. 9). The produced log volume is high as a consequence of the use of block logging instead of record logging.

All the analysed recovery approaches require a committed transaction to have been involved in at least one disc access. Therefore they do not meet the soft real-time response requirement. The neighbour write ahead logging strategy presented in Part ill removes this bottleneck. 22 Chapter 4 The Block Oriented Approach This chapter presents the block oriented recovery approach. e. blocks are the units of locking and logging. Recovery methods based on the block oriented approach are fully or partially used by commercial DBMS products, for example RA2 ([BJWK+76]), smAS ([Ref86]), TORNADO ([MET88]), Oracle ([Dea87]), and Sybase ([DP88]).

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