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.
Type:
Grant
Filed:
September 23, 2009
Date of Patent:
February 21, 2012
Assignee:
International Business Machines Corporation
Inventors:
Ming Li, Hai Feng Li, Yun Feng Sun, Sheng Zhao
Abstract: A current-mode analog-to-digital converter includes: a current input node; a current-mode sample and hold circuit configured to output a steady source of electrical current having an analog value proportional to a sampled analog value of an electrical current at the current input node; and at least one current comparator that compares the electrical current output by the current-mode sample and hold circuit to at least one reference current to produce a digital representation of the sampled analog value of the electrical current at the current input node.
Type:
Grant
Filed:
August 27, 2010
Date of Patent:
September 27, 2011
Assignee:
Siflare, Inc.
Inventors:
Rex K. Hales, Marcellus C. Harper, Tracy Johancsik, Yusuf Haque