CS 223 : Assignment 3
نویسنده
چکیده
Question 1. • We studied three types of logging strategies in class: physical, logical, and physiological. Briefly (1-2 lines) explain the difference between the three logging strategies. • Consider recovery algorithms for transaction aborts and system restart that are based on logging. These recovery algorithms require that log records for a transaction must be forced to disk when a transaction commits. Illustrate using an example what can go wrong in case a transaction is permitted to commit before its log records are flushed to disk. • One way to avoid having to force log records to disk before commit without jeopardizing atomicity of a transaction is to force each data page updated by the transaction to persistent storage before the commitment of the transaction. Why is this not a good idea?
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