David G Gagne

US Patent:

7599967, Oct 6, 2009

Filed:

Mar 20, 2007

Appl. No.:

11/688550

Inventors:

Mahesh Baburao Girkar - Cupertino CA, US
Steven McGee - Bedford NH, US
David Gagne - Goffstown NH, US

Assignee:

Oracle International Corporation - Redwood Shores CA

International Classification:

G06F 17/30

US Classification:

707200, 707202, 707204

Abstract:

Techniques for reducing commit latency in a database system having a primary database system and a standby database system that is receiving a stream of redo data items from the primary. The standby sends an acknowledgment for a received item of redo data before the standby writes the redo data item to a redo log for the stream. When a no more redo event occurs in the standby, the standby sets a “no data lost flag” in the redo log if the stream of redo data items has no gaps and all of the redo data items received in the standby have been written to the redo log. The database system may operate in a first mode in which an acknowledgment is sent as just described and a second mode in which an acknowledgment is sent after the redo data item has been written to the redo log.

US Patent:

20070110026, May 17, 2007

Filed:

Nov 14, 2005

Appl. No.:

11/274376

Inventors:

Amit Sinha - Marlborough MA, US
David Gagne - Newburyport MA, US

International Classification:

H04L 12/28

US Classification:

370351000

Abstract:

A system for providing power and data to at least two Ethernet devices over a common Ethernet cable includes a combiner circuit and a splitter circuit. The combiner circuit receives first and second Ethernet cables and is configured to route power and data signals communicated over the first and second Ethernet cables over a common cable. The splitter circuit is configured to receive the common cable and route the power and data signals routed over the common cable over third and fourth Ethernet cables.

US Patent:

53033477, Apr 12, 1994

Filed:

Dec 27, 1991

Appl. No.:

7/815007

Inventors:

David A. Gagne - Goffstown NH
Satish L. Rege - Groton MA

Assignee:

Digital Equipment Corporation - Maynard MA

International Classification:

G06F 1314

US Classification:

395250

Abstract:

A method and apparatus for transferring packets of information with different attributes from a device interface to buffers in a host memory dedicated to particular attribute values or ranges of values. The apparatus consists of multiple shared data structures in the form of receive rings, each associated with memory buffers dedicated to a particular range of values for a particular packet attribute. The device interface determines which receive ring is associated with a buffer dedicated to the proper attribute value range by comparing the value of the attribute of the received packet with the values of attributes associated with the buffers of each ring. A sequencing ring is provided to store the order in which each receive ring must be accessed by the host cpu when retrieving packets. This sequencing ring ensures that the host cpu will retrieve the packets in the order in which they were received.

US Patent:

53902998, Feb 14, 1995

Filed:

Dec 27, 1991

Appl. No.:

7/814998

Inventors:

Satish L. Rege - Groton MA
Kadangode K. Ramakrishnan - Maynard MA
David A. Gagne - Goffstown NH

Assignee:

Digital Equipment Corporation - Maynard MA

International Classification:

G06F 1342
G06F 1200

US Classification:

395250

Abstract:

In a network adapter for a host computer, the data occupancy level of a buffer memory used to store network packets is monitored, and the occupancy level is reported to the host. The buffer memory is organized as a plurality of fixed-size pages. A memory controller uses an allocation counter to track the number of pages available to store incoming data packets, and the value of the allocation counter is compared with a programmable threshold. A data word accompanies each packet delivered to the host to indicate whether the allocation count exceeds the threshold. When the buffer memory has insufficient free space to store an incoming packet, the packet is discarded. The network adapter keeps a count of the number of discarded packets. An adapter manager microprocessor, which is part of the network adapter, reports the count to the host computer on request. The adapter manager also reports the value of the allocation count and other important network adapter variables to the host computer.

US Patent:

20230033806, Feb 2, 2023

Filed:

Jul 30, 2021

Appl. No.:

17/389835

Inventors:

- Redwood Shores CA, US
Giridhar Ravipati - Foster City CA, US
Ian Neall - Henley-on-Thames, GB
Frank Lange - Woerden, NL
Jing Zheng - Foster City CA, US
Mahesh Girkar - Los Altos CA, US
David Gagne - Goffstown NH, US
Nitin Karkhanis - Nashua NH, US
Sadhana Kyathappala - Westford MA, US
Qingguang Cui - Redwood Shores CA, US

International Classification:

G06F 16/27
G06F 16/23
G06F 11/14

Abstract:

Herein is high availability for online transaction processing with redundancy and redo for a federation of pluggable databases and container databases. In an embodiment of a federation of container database management systems that includes a first container database, first redo data of a first pluggable database in a second container database is obtained based on a database dictionary in the first container database. To the first pluggable database in the first container database, the first redo data of the first pluggable database in the second container database is applied. Based on the database dictionary in the first container database, second redo data of a second pluggable database in a third container database is obtained. To the second pluggable database in the first container database, without modifying content of the first pluggable database in the first container database, the second redo data of the second pluggable database in the third container database is applied.