Patents by Inventor Mark W. Sirek

Mark W. Sirek has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Efficiently performing inequality joins
    Patent number: 7644083
    Abstract: A database system is able to receive a query that specifies an inequality join involving at least a first relation and a second relation. A plurality of segments of the first relation are sorted in the cache. Each sorted segment of the first relation in the cache is compared with the second relation.
    Type: Grant
    Filed: September 30, 2004
    Date of Patent: January 5, 2010
    Assignee: Teradata US, Inc.
    Inventor: Mark W. Sirek
  • Emulating a database system
    Patent number: 7155428
    Abstract: A method and apparatus provides for the extraction of environment information from a target database system. The environment information includes at least one of cost-related information and random sample statistics. The cost-related information and/or random sample statistics are imported to a test system, where the cost-related information and/or random sample statistics are used in query plan analysis by an optimizer.
    Type: Grant
    Filed: December 31, 2001
    Date of Patent: December 26, 2006
    Assignee: NCR Corp.
    Inventors: Douglas P. Brown, Mark W. Sirek, Jeetendra Chaware