Fast recovery and buffered logging

If a database uses buffered logging (as described in Buffered transaction logging), some logical-log records associated with committed transactions might not be written to the logical log at the time of the failure. If this occurs, fast recovery cannot restore those transactions. Fast recovery can restore only transactions with an associated COMMIT record stored in the logical log on disk. (For this reason, buffered logging represents a trade-off between performance and data vulnerability.)

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