Asynchronous checkpointing system for error recovery
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United States of America Patent
Stats
-
Sep 29, 1987
Grant Date -
N/A
app pub date -
Mar 14, 1983
filing date -
Mar 14, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method of recovering from an error condition during operation of a program that is modifying a data base without corrupting the data base, wherein the program includes calls to record the progress of the operation in a table in memory. On the occurrence of an error condition, the tables for all programs in operation are transferred to a disk. During error recovery, the tables are returned to memory where the information stored in the respective tables is used by each active program to restore operation of the particular program to a point where the operation can be completed without corrupting the data base. Each program is designed to interrogate its own recovery table following the occurrence of an error condition to restore operation at a point where the integrity of the data base is assured.
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