Data processing: database and file management or data structures – Data integrity – Concurrent read/write management using locks
Reexamination Certificate
2011-04-05
2011-04-05
Le, Debbie (Department: 2168)
Data processing: database and file management or data structures
Data integrity
Concurrent read/write management using locks
C707S705000, C709S210000
Reexamination Certificate
active
07921090
ABSTRACT:
Methods and apparatuses for providing access to data in a cluster database are described. Embodiments of the invention include identifying situations in which many nodes require relatively equal access to a data block, and taking appropriate measures to improve the performance of the system in these situations. For example, a node may automatically downgrade its lock from an X lock to an S lock as soon as it has finished a modification of the data. S locks are sent to other nodes in the system as soon as a modification is complete. Modifications to the data are also sent to other nodes in the system as soon as a modification is complete. Depending on the size of the data modification, the entire data block may be sent, or only the modifications to the data may be sent.
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Ho Eugene
Macnaughton Neil
Ono Kotaro
van den Bergh Herbert
Zoll Michael
Le Debbie
Oracle International Corporation
Tran Bao G
Vista IP Law Group LLP.
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