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The three traditional failure classes are system, media, and transactionfailures. Sometimes, however, modern storage exhibits failures that differ fromall of those. In order to capture and describe such cases, single-page failuresare introduced as a fourth failure class. This class encompasses all failuresto read a data page correctly and with plausible contents despite allcorrection attempts in lower system levels. Efficient recovery seems to requirea new data structure called the page recovery index. Its transactionalmaintenance can be accomplished writing the same number of log records astoday's efficient implementations of logging and recovery. Detection andrecovery of a single-page failure can be sufficiently fast that the affecteddata access is merely delayed, without the need to abort the transaction.

Definition, Detection, and Recovery of Single-Page Failures, a Fourth Class of Database Failures