Method and apparatus for controlling concurrent access to a data file. The data file is organized into a plurality of partitions, and a lock file that is accessible to the client applications is persistently stored. The lock file includes lock objects that correspond to the plurality of partitions, and...http://www.google.de/patents/US7444349?utm_source=gb-gplus-sharePatent US7444349 - Control of concurrent access to a partitioned data file
