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:
Jan. 05, 2010
Filed:
Jul. 30, 2007
Shrikanth Shankar, San Francisco, CA (US);
Ramesh Kumar, Foster City, CA (US);
Amirali S. Valiani, San Jose, CA (US);
Vasudha Krishnaswamy, Fremont, CA (US);
Ananth Raghavan, San Francisco, CA (US);
Juan R. Loaiza, Woodside, CA (US);
Shrikanth Shankar, San Francisco, CA (US);
Ramesh Kumar, Foster City, CA (US);
Amirali S. Valiani, San Jose, CA (US);
Vasudha Krishnaswamy, Fremont, CA (US);
Ananth Raghavan, San Francisco, CA (US);
Juan R. Loaiza, Woodside, CA (US);
Oracle International Corporation, Redwood Shores, CA (US);
Abstract
Techniques for avoiding lock contention when processing data definition language (DDL) statements are provided. Some DDL statements modify metadata of a table and then require access to the table. After such a DDL statement modifies the metadata of a table and the updated metadata is made available (i.e., published) to other database statements, execution of the DDL statement is suspended. Data manipulation language (DML) statements acquire locks on the table. In one approach, the locks, of any DML statement, that are granted after the DDL statement is issued are timestamped. The DDL statement uses the timestamps to determine when to access the table. The timestamps are used to determine when the last DML statement (that was pending at the time the modified metadata was published) commits and releases its lock on the table.