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:
Oct. 18, 2011
Filed:
Jul. 30, 2007
Ananth Raghavan, San Francisco, CA (US);
Shrikanth Shankar, San Francisco, CA (US);
Ramesh Kumar, Foster City, CA (US);
Ananth Raghavan, San Francisco, CA (US);
Shrikanth Shankar, San Francisco, CA (US);
Ramesh Kumar, Foster City, CA (US);
Oracle International Corporation, Redwood Shores, CA (US);
Abstract
Techniques for a data definition language (DDL) statement acquiring a lock on a table in wait mode in a deadlock free manner are provided. A DDL statement specifies metadata of a table that is to be modified, whereas a data manipulation language (DML) statement specifies a table to be modified. When a DDL statement is received, a proxy statement is initiated and executed instead of first acquiring an exclusive lock on metadata of a particular table. The proxy statement is similar to a DML statement in that the proxy statement acquires a lock on the particular table. After the proxy statement has been processed, an exclusive lock on the metadata is acquired.