Abstract
Obviously, it is impossible to finish a restore operation much faster than single-pass restore does. Therefore, “instant restore” merely gives the illusion of a truly instant restore operation: it permits queries and updates practically immediately after a replacement device is available, i.e., formatted but empty. Nonetheless, in spite of concurrent transactions, the restore operation may complete in about the same time as an offline single-pass restore operation, i.e., much faster than a traditional restore operation with log replay using log records in their original order.
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