Soft checkpointing system using log sequence numbers derived fro

Details Soft checkpointing system using log sequence numbers derived fro Soft checkpointing system using log sequence numbers derived fro

1988-04-08

1991-08-27

Williams, Jr., Archie E.

Boots, shoes, and leggings

3642689, 3642671, 3642678, 364285, 3642852, 3642853, 371 12, G06F 1130, G06F 9312, G06F 1208

Patent

active

050438662

ABSTRACT:
Functions MINBUFLSN and LOWTRANLSN, implemented in a computerized routine, are defined and comprise first and second components of a checkpoint. MINBUFLSN is functionally related to a first update to a first of "dirty" data pages in the RAM buffer. LOWTRANLSN is functionally related to the earliest update of a sequence in a transaction table wherein each update corresponds to an uncommitted transaction. The two components are derived during write-ahead logging and stored in the log header periodically as a function of logging activity. Upon recovery, the checkpoint is retrieved and a functional comparison between the components thereof employed in the recovery algorithm. The conventional analysis pass of the recovery log is avoided and a reduced overhead during logging is provided as well as an efficient recovery.

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