Patents by Inventor Gangavara Prasad Varakur

Gangavara Prasad Varakur 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).

  • Publication number: 20080208938
    Abstract: A distributed database system providing data and space management methodology. In a distributed system comprising a plurality of servers sharing access to data pages, a method for setting a timestamp indicating when modifications to data pages are made in a non-regressing fashion comprises steps of: maintaining a local sequence at each server and an allocation page timestamp on an allocation page; upon allocation of a data page, applying a timestamp to the data page which is greater than the allocation page timestamp; upon modification of a given data page at a particular server, setting the timestamp on the given data page to the greater of the local sequence at the particular server and an existing timestamp already on the given data page; and when data pages are deallocated, adjusting the allocation page timestamp to a value greater than the timestamp value on any deallocated data page.
    Type: Application
    Filed: February 22, 2008
    Publication date: August 28, 2008
    Applicant: SYBASE, INC.
    Inventors: Mei-Lin Linda Lin, Fei Zhou, Joe Francis, Srikanth Sampath, Satya N. Ramachandran, Gangavara Prasad Varakur
  • Patent number: 7403945
    Abstract: A distributed database system providing data and space management methodology is described. In one embodiment, for example, a method is described for detection of deadlocks in a distributed database system comprising a plurality of servers sharing access to data, the method comprises steps of: in response to a task at a first server waiting to obtain a lock regulating access to data, sending a search request including lock information to a second server holding the lock; at the second server, examining dependencies of the task holding the lock based on the lock information received with the search request and local lock information; if the task holding the lock is waiting to obtain a lock held by an additional server, forwarding the search request and local lock information to the additional server; repeating the examining and forwarding steps until all dependencies are examined; and responding to the search request indicating whether a deadlock was detected and providing lock information found.
    Type: Grant
    Filed: November 1, 2004
    Date of Patent: July 22, 2008
    Assignee: Sybase, Inc.
    Inventors: Mei-Lin Linda Lin, Fei Zhou, Joe Francis, Srikanth Sampath, Satya N. Ramachandran, Gangavara Prasad Varakur
  • Publication number: 20080172429
    Abstract: A distributed database system providing data and space management methodology. In one embodiment a system for allocating resources amongst a plurality of database servers sharing resources comprises: an input module for receiving user input for allocating resources shared amongst a plurality of database servers and establishing thresholds for utilization of resources at each database server; a monitoring module at each database server for monitoring local resource utilization at each database server and sending a request for balancing resources to a second database server when local resource utilization reaches an established threshold at a first database server; and a load balancing module for receiving the request for balancing resources and determining whether to adjust resources allocated to the first database server and the second database server in response to the request.
    Type: Application
    Filed: March 25, 2008
    Publication date: July 17, 2008
    Applicant: SYBASE, INC.
    Inventors: Mei-Lin Linda Lin, Fei Zhou, Joe Francis, Srikanth Sampath, Satya N. Ramachandran, Gangavara Prasad Varakur
  • Publication number: 20070276833
    Abstract: System and method for assignment of unique identifiers in a distributed environment. In a distributed system having a plurality of nodes, a method for allocating identifiers comprises steps of: allocating a pool of identifiers for use; maintaining lists of free identifiers in the pool at participating nodes; obtaining at a first node permission to update the lists of free identifiers; upon receiving permission to update the lists, allocating for the first node a set of identifiers from the lists; updating the lists of free identifiers to reflect allocation of the set of identifiers for the first node; sending the updated lists from the first node to other participating nodes; upon receiving the updated lists of free identifiers at each other participating node, updating each other participating node's respective copy of the lists of free identifiers; and relinquishing the first node's permission to update the lists of free identifiers.
    Type: Application
    Filed: March 26, 2007
    Publication date: November 29, 2007
    Applicant: SYBASE, INC.
    Inventors: Raj Kumar Sen, Gangavara Prasad Varakur
  • Publication number: 20060101081
    Abstract: A distributed database system providing data and space management methodology is described. In one embodiment, for example, a method is described for detection of deadlocks in a distributed database system comprising a plurality of servers sharing access to data, the method comprises steps of: in response to a task at a first server waiting to obtain a lock regulating access to data, sending a search request including lock information to a second server holding the lock; at the second server, examining dependencies of the task holding the lock based on the lock information received with the search request and local lock information; if the task holding the lock is waiting to obtain a lock held by an additional server, forwarding the search request and local lock information to the additional server; repeating the examining and forwarding steps until all dependencies are examined; and responding to the search request indicating whether a deadlock was detected and providing lock information found.
    Type: Application
    Filed: November 1, 2004
    Publication date: May 11, 2006
    Applicant: SYBASE, INC.
    Inventors: Mei-Lin Lin, Fei Zhou, Joe Francis, Srikanth Sampath, Satya Ramachandran, Gangavara Prasad Varakur