Method of prevention of dangling transaction occurrence using a

Details Method of prevention of dangling transaction occurrence using a Method of prevention of dangling transaction occurrence using a

1997-11-19

1999-11-09

Palys, Joseph E.

Error detection/correction and fault detection/recovery

Data processing system error or fault handling

Reliability and availability

714 20, G06F 1114

Patent

active

059833610

ABSTRACT:
The present invention relates to a recovery function from a system failure such as a power failure and a media failure such as a breakage of disk at a transaction processing system of a plurality of user environment, and is applied in carrying out a checkpoint to reduce an amount of work required for failure recovery, and particularly to a fuzzy checkpoint method which is a method of enhancing a system performance by not interrupting other transactions ever for a moment at the time of checkpoint. According to the present invention, the occurrance of dangling transaction is prevented by deleting the corresponding transaction entry from the transaction table during performing of the redo step, for the transactions terminated between the point of time when the checkpoint start log record of the last completed checkpoint is logged and the point of time when the checkpoint end log record is logged.

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