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Database systems recover persistent data, providing high database availability. However, database applications, typic ally residing on client or "middle-tier" application-server machines , may lose work because of a server failure. This prevents the masking of server failures from the human user and substantial ly degrades application availability. This paper aims to enable high application availability with an integrated method for database server recovery and transparent application recovery in a client-serve r system. The approach, based on application message logging, is similar to earlier work on distributed system fault tolerance. However, we exploit advanced database logging and recovery techniques and request/reply messaging properties t o significantly improve efficiency. Forced log I/Os, frequently req uired by other methods, are usually avoided. Restart time, for bot h failed server and failed client, is reduced by checkpointing and log truncation. Our method ensures that a server can recover indepe ndently of clients. A client may reduce logging overhead in return for dependency on server availability during client res tart.

Efficient transparent application recovery in client-server information systems