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:
Feb. 21, 2012
Filed:
Sep. 23, 2009
Ming LI, Beijing, CN;
Hai Feng LI, Beijing, CN;
Yun Feng Sun, Beijing, CN;
Sheng Zhao, Beijing, CN;
International Business Machines Corporation, Armonk, NY (US);
Abstract
A method for joining tables in multiple heterogeneous distributed databases implemented by at least two data sources accessible to a federal database server over a network includes: transmitting from the federated database server a sub-command to a first of the data sources responsive to the federated database server receiving a data query; retrieving, with the federated database server, block data from the first data source related to the data query using block fetching according to the sub-command; transmitting, with the federated database server, at least a portion of the block data to a second of the data sources together with an instruction for the second data source to perform a join operation on the portion of the block data and a data table stored by the second data source related to the query; and retrieving a result of the join operation with the federated database server.