Transactional protocol and system for implementing it

Details Transactional protocol and system for implementing it Transactional protocol and system for implementing it

1995-11-20

1997-08-12

Swann, Tod R.

395726, 395617, 395479, 395474, G06F 1200

Patent

active

056574746

ABSTRACT:
A transactional protocol allocates write intention locks at the time of access to a transaction modifying data stored in a memory. These locks do not prohibit the allocation of read locks to other transactions. The other transactions can therefore read the old values of the variables until the new values are written into the memory when the transaction is closed. The time for which reading of data being modified is prohibited is restricted to the time to write the new values into the memory. This protocol is of particular benefit if the memory is a volatile memory and the modified data is backed up in another, non-volatile memory. In this case, the protocol further keeps up-to-date a table stored in the non-volatile memory and containing the identifiers of current transactions. This table is used to ensure that the data is consistent after failure of the volatile memory and contributes to maintaining a minimal time of prohibition of reading of data being modified. Applications of the protocol include telecommunication network control systems.

REFERENCES:
patent: 5220657 (1993-06-01), Bly et al.
patent: 5247672 (1993-09-01), Mohan
patent: 5459871 (1995-10-01), Van Den Berg
patent: 5465328 (1995-11-01), Dievendorff et al.
patent: 5596754 (1997-01-01), Lomet
Cabrera et al, "Implementing Atomicity in Two Systems: Techniques, Tradeoffs and Experience", IEEE Transactions on Software Engineering, vol. 19, No. 10, Oct. 1993, New York pp. 950-961.
"Multigranularity Locking Divergence Control for Epsilon Serializability", IBM Technical Disclosure Bulletin, vol. 36, No. 6B, Jun 1993, New York, US p. 563-568, XP 000377483.

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