The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 26, 2019
Filed:
Dec. 29, 2015
Oracle International Corporation, Redwood Shores, CA (US);
Sanket Hase, Mountain View, CA (US);
Neil MacNaughton, Los Gatos, CA (US);
Vivekanandhan Raja, Foster City, CA (US);
Atrayee Mullick, Santa Clara, CA (US);
Vineet Marwah, San Ramon, CA (US);
Amit Ganesh, San Jose, CA (US);
Oracle International Corporation, Redwood Shores, CA (US);
Abstract
Techniques are described for maintaining coherency of a portion of a database object populated in the volatile memories of multiple nodes in a database cluster. The techniques involve maintaining a local invalidation bitmap for chunks of data stored in memory in each particular node in the cluster by tracking locks granted by a lock manager. During a pre-loading operation, each given node requests a set of shared locks associated with the chunks of data to be store in the given node's memory. When a request to release one of these shared locks occurs, the in-memory copy of those data items may be invalidated in the node releasing its shared lock.