Log archive filtering method for transaction-consistent forward

Details Log archive filtering method for transaction-consistent forward Log archive filtering method for transaction-consistent forward

1991-12-23

1994-01-11

Shaw, Gareth D.

Boots, shoes, and leggings

364DIG2, 3642821, 3642852, 395700, G06F 1500, G06F 1540, G06F 722, G06F 1108, G06F 1200

Patent

active

052789829

ABSTRACT:
A method for implementing transaction-consistent resource recovery from catastrophic media failures in a single pass over a recovery log archive while permitting most UNDO log records to be discarded during log archiving. The media recovery procedure is based on a pseudo-crash recovery technique that simulates a system crash at a selected time by writing PSEUDO-RECOVERY records to the recovery log. Resource recovery is then performed by normal execution of the log archive records up to the most recent pseudo-crash followed by execution of the subsequent PSEUDO-RECOVERY records. The recovery log record execution procedures are compatible with the ARIES recovery method. One embodiment of this invention assumes that the recovery log records can be selected for archiving on the basis of a combination of record type and transaction identifier.

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