Early Commit Timestamp Computer Database Protocol.
Patent, Filed 28 Apr 94, patented 25 Jun 96,
DEPARTMENT OF THE NAVY WASHINGTON DC
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A computer database method wherein the data is organized into atomic data sets and transactions are separated into projections which operate on only one atomic data set. Multiple transactions can thereby access the same atomic data set using a plurality of projections. A projection timestamp is generated by the system initial access to the atomic data set by the projection. Read and write timestamps are maintained separately by the atomic data set. Upon each read and write command, the issuing projection timestamp is compared against the appropriate atomic data set read or write timestamp. The operation succeeds if the compared timestamps do not indicate a conflict. Upon failure the projection is restarted with a new timestamp.
- Computer Systems