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:
May. 26, 2015
Filed:
Jun. 05, 2012
Tanvir Ahmed, Hayward, CA (US);
Thomas Keefe, Mill Valley, CA (US);
Chao Liang, San Ramon, CA (US);
Vikram Pesati, San Jose, CA (US);
Tanvir Ahmed, Hayward, CA (US);
Thomas Keefe, Mill Valley, CA (US);
Chao Liang, San Ramon, CA (US);
Vikram Pesati, San Jose, CA (US);
ORACLE INTERNATIONAL CORPORATION, Redwood Shores, CA (US);
Abstract
Techniques are provided for a database server to identify a query that comprises an access check operator specifying a data access control policy, and if so, to re-write the query to produce an optimized query execution plan. A first technique rewrites a query comprising an access check operator based on the privileges associated with the database principal requesting the query. The rewritten query exposes the access predicates relevant to the requesting principal to subsequent database optimization processes. A second technique rewrites a query comprising an access check operator that specifies a data security policy that does not include a denied privilege. A third technique rewrites a query that comprises an access check operator specifying one or more database table columns that store row-specific access control lists. The rewritten queries are used to generate a query execution plan that provides for several query execution optimizations.