Locking data in a database after an operation has begun

Details Locking data in a database after an operation has begun Locking data in a database after an operation has begun

2000-11-16

2010-06-08

Alam, Hosain T (Department: 2166)

Data processing: database and file management or data structures

Data integrity

Concurrent read/write management using locks

Reexamination Certificate

active

07734604

ABSTRACT:
A database management system receives a request to perform an operation on a set of target data and, at some point after it begins executing that operation, places a lock on the target data to prevent concurrent execution of other operations on the target data. In some embodiments, the system receives an instruction from a user to perform a data-definition operation on a set of target data; places an initial lock on the target data at a level that allows at least one concurrent operation on the target data; begins executing the operation; and then places a final lock on the target data at a level that excludes all other concurrent operations on the target data.

REFERENCES:
patent: 5485607 (1996-01-01), Lomet et al.
patent: 5546579 (1996-08-01), Josten et al.
patent: 5745703 (1998-04-01), Cejtin et al.
patent: 6070170 (2000-05-01), Friske et al.
patent: 6101497 (2000-08-01), Ofek
patent: 6460055 (2002-10-01), Midgley et al.

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