Patents by Inventor Prakash Sundaresan

Prakash Sundaresan 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).

  • Method and apparatus for performing a join query in a database system
    Patent number: 5987453
    Abstract: A computer implemented method for generating a response to a join. Two tables are divided into fragments. A join fragment map identifies, for each respective fragment from the first table, the fragments from the second table which contain a record that satisfies the join predicate with a record from the respective fragment from the first table. The map is used to eliminate fragments which cannot satisfy the join predicate.
    Type: Grant
    Filed: April 7, 1997
    Date of Patent: November 16, 1999
    Assignee: Informix Software, Inc.
    Inventors: Murali M. Krishna, Anurag Kashyap, Robert Howard Gerber, Paul Sherwood Taylor, Scott Alan Shurts, Shengsong Ni, Prakash Sundaresan
  • Generalized key indexes
    Patent number: 5870747
    Abstract: Generalized key indexes enable a first table of a relational database to be indexed using an index key and index conditions, wherein either or both of the index key and index conditions may reference multiple tables of the database or may be an expression using fields of one or more tables other than the first table. The generalized key indexes directly associate generalized index key values with record identifiers of records of the first table, thus enabling efficient storage and data retrieval.
    Type: Grant
    Filed: July 9, 1996
    Date of Patent: February 9, 1999
    Assignee: Informix Software, Inc.
    Inventor: Prakash Sundaresan