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Database backups have traditionally been used as the primary mechanism torecover from hardware and user errors. High availability solutions maintainredundant copies of data that can be used to recover from most failures exceptuser or application errors. Database backups are neither space nor timeefficient for recovering from user errors which typically occur in the recentpast and affect a small portion of the database. Moreover periodic full backupsimpact user workload and increase storage costs. In this paper we present ascheme that can be used for both user and application error recovery startingfrom the current state and rewinding the database back in time using thetransaction log. While we provide a consistent view of the entire database asof a point in time in the past, the actual prior versions are produced only fordata that is accessed. We make the as of data accessible to arbitrary point intime queries by integrating with the database snapshot feature in Microsoft SQLServer.

Transaction Log Based Application Error Recovery and Point In-Time Query