Patents by Inventor Vinay Srihari

Vinay Srihari 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).

  • Patent number: 10055250
    Abstract: Each of a plurality of Worker processes are allowed to perform any and all of the following tasks involving logged work items: (1) reading a subset of the work items from a log; (2) sequentially ordering work items for corresponding data objects; (3) applying a sequentially ordered set of work items to a corresponding data object; and (4) transmitting a subset of work items to a Worker process running on another database server in a cluster, if necessary. These tasks can be performed concurrently, at will, and as available, by the Worker processes. An improved checkpointing technique eliminates the need for the Worker processes to get to a synchronization point and stop. Instead, a Coordinator process examines the current state of progress of the Worker processes and computes a past point in the sequence of work items at which all work items before that point have been completely processed, and records this point as the checkpoint.
    Type: Grant
    Filed: October 21, 2013
    Date of Patent: August 21, 2018
    Assignee: Oracle International Corporation
    Inventors: Wei Hu, Yunrui Li, Vinay Srihari, Ramana Yerneni
  • Patent number: 9519589
    Abstract: Techniques are provided for managing caches in a system with multiple caches that may contain different copies of the same data item. Specifically, techniques are provided for coordinating the write-to-disk operations performed on such data items to ensure that older versions of the data item are not written over newer versions, and to reduce the amount of processing required to recover after a failure. Various approaches are provided in which a master is used to coordinate with the multiple caches to cause a data item to be written to persistent storage. Techniques are also provided for transferring data items and locks associated with the data items from one node to another.
    Type: Grant
    Filed: August 8, 2011
    Date of Patent: December 13, 2016
    Assignee: ORACLE INTERNATIONAL CORPORATION
    Inventors: Sashikanth Chandrasekaran, Roger J. Bamford, William H. Bridge, David Brower, Neil MacNaughton, Wilson Wai Shun Chan, Vinay Srihari
  • Patent number: 9189502
    Abstract: Techniques for moving data files without interrupting access are described. A first process moves a database file from a first location to a second location while the database file is accessible to one or more other processes for read or write operations. According to one technique, the first process communicates a move status and a copy range into the database file to one or more database server instances executing the one or more other processes. The one or more other processes then perform input/output (IO) operations on the database file based at least in part on the move status and the copy range communicated by the first process.
    Type: Grant
    Filed: September 28, 2012
    Date of Patent: November 17, 2015
    Assignee: Oracle International Corporation
    Inventors: Vsevolod Panteleenko, Yunrui Li, Jonghyun Lee, Margaret M. Susairaj, William H. Bridge, Jr., Vinay Srihari
  • Publication number: 20140196055
    Abstract: Each of a plurality of Worker processes are allowed to perform any and all of the following tasks involving logged work items: (1) reading a subset of the work items from a log; (2) sequentially ordering work items for corresponding data objects; (3) applying a sequentially ordered set of work items to a corresponding data object; and (4) transmitting a subset of work items to a Worker process running on another database server in a cluster, if necessary. These tasks can be performed concurrently, at will, and as available, by the Worker processes. An improved checkpointing technique eliminates the need for the Worker processes to get to a synchronization point and stop. Instead, a Coordinator process examines the current state of progress of the Worker processes and computes a past point in the sequence of work items at which all work items before that point have been completely processed, and records this point as the checkpoint.
    Type: Application
    Filed: October 21, 2013
    Publication date: July 10, 2014
    Applicant: Oracle International Corporation
    Inventors: Wei Hu, Yunrui Li, Vinay Srihari, Ramana Yerneni
  • Publication number: 20140095553
    Abstract: Techniques for moving data files without interrupting access are described. A first process moves a database file from a first location to a second location while the database file is accessible to one or more other processes for read or write operations. According to one technique, the first process communicates a move status and a copy range into the database file to one or more database server instances executing the one or more other processes. The one or more other processes then perform input/output (IO) operations on the database file based at least in part on the move status and the copy range communicated by the first process.
    Type: Application
    Filed: September 28, 2012
    Publication date: April 3, 2014
    Applicant: ORACLE INTERNATIONAL CORPORATION
    Inventors: Vsevolod PANTELEENKO, Yunrui LI, Jonghyun LEE, Margaret M. SUSAIRAJ, William H. BRIDGE, Jr., Vinay SRIHARI
  • Patent number: 8566326
    Abstract: Each of a plurality of Worker processes are allowed to perform any and all of the following tasks involving logged work items: (1) reading a subset of the work items from a log; (2) sequentially ordering work items for corresponding data objects; (3) applying a sequentially ordered set of work items to a corresponding data object; and (4) transmitting a subset of work items to a Worker process running on another database server in a cluster, if necessary. These tasks can be performed concurrently, at will, and as available, by the Worker processes. An improved checkpointing technique eliminates the need for the Worker processes to get to a synchronization point and stop. Instead, a Coordinator process examines the current state of progress of the Worker processes and computes a past point in the sequence of work items at which all work items before that point have been completely processed, and records this point as the checkpoint.
    Type: Grant
    Filed: November 5, 2004
    Date of Patent: October 22, 2013
    Assignee: Oracle International Corporation
    Inventors: Wei Hu, Yunrui Li, Vinay Srihari, Ramana Yemeni
  • Patent number: 8438169
    Abstract: Each of a plurality of Worker processes are allowed to perform any and all of the following tasks involving logged work items: (1) reading a subset of the work items from a log; (2) sequentially ordering work items for corresponding data objects; (3) applying a sequentially ordered set of work items to a corresponding data object; and (4) transmitting a subset of work items to a Worker process running on another database server in a cluster, if necessary. These tasks can be performed concurrently, at will, and as available, by the Worker processes. An improved checkpointing technique eliminates the need for the Worker processes to get to a synchronization point and stop. Instead, a Coordinator process examines the current state of progress of the Worker processes and computes a past point in the sequence of work items at which all work items before that point have been completely processed, and records this point as the checkpoint.
    Type: Grant
    Filed: November 5, 2004
    Date of Patent: May 7, 2013
    Assignee: Oracle International Corporation
    Inventors: Wei Hu, Yunrui Li, Vinay Srihari, Ramana Yemeni
  • Publication number: 20110295822
    Abstract: Techniques are provided for managing caches in a system with multiple caches that may contain different copies of the same data item. Specifically, techniques are provided for coordinating the write-to-disk operations performed on such data items to ensure that older versions of the data item are not written over newer versions, and to reduce the amount of processing required to recover after a failure. Various approaches are provided in which a master is used to coordinate with the multiple caches to cause a data item to be written to persistent storage. Techniques are also provided for transferring data items and locks associated with the data items from one node to another.
    Type: Application
    Filed: August 8, 2011
    Publication date: December 1, 2011
    Inventors: Sashikanth Chandrasekaran, Roger J. Bamford, William H. Bridge, David Brower, Neil MacNaughton, Wilson Wai Shun Chan, Vinay Srihari
  • Patent number: 8051046
    Abstract: Techniques are provided for managing caches in a system with multiple caches that may contain different copies of the same data item. Specifically, techniques are provided for coordinating the write-to-disk operations performed on such data items to ensure that older versions of the data item are not written over newer versions, and to reduce the amount of processing required to recover after a failure. Various approaches are provided in which a master is used to coordinate with the multiple caches to cause a data item to be written to persistent storage. Techniques are also provided for managing checkpoints associated with the caches, where the checkpoints are used to determine the position at which to begin processing recovery logs in the event of a failure.
    Type: Grant
    Filed: February 20, 2007
    Date of Patent: November 1, 2011
    Assignee: Oracle International Corporation
    Inventors: Sashikanth Chandrasekaran, Roger J. Bamford, William H. Bridge, David Brower, Neil MacNaughton, Wilson Wai Shun Chan, Vinay Srihari
  • Publication number: 20110173169
    Abstract: Techniques are provided for managing caches in a system with multiple caches that may contain different copies of the same data item. Specifically, techniques are provided for coordinating the write-to-disk operations performed on such data items to ensure that older versions of the data item are not written over newer versions, and to reduce the amount of processing required to recover after a failure. Various approaches are provided in which a master is used to coordinate with the multiple caches to cause a data item to be written to persistent storage. Techniques are also provided for managing checkpoints associated with the caches, where the checkpoints are used to determine the position at which to begin processing recovery logs in the event of a failure.
    Type: Application
    Filed: March 23, 2011
    Publication date: July 14, 2011
    Applicant: ORACLE INTERNATIONAL CORPORATION
    Inventors: Sashikanth Chandrasekaran, Roger J. Bamford, William H. Bridge, David Brower, Neil Macnaughton, Wilson Wai Shun Chan, Vinay Srihari
  • Patent number: 7930278
    Abstract: Techniques are provided for managing caches in a system with multiple caches that may contain different copies of the same data item. Specifically, techniques are provided for coordinating the write-to-disk operations performed on such data items to ensure that older versions of the data item are not written over newer versions, and to reduce the amount of processing required to recover after a failure. Various approaches are provided in which a master is used to coordinate with the multiple caches to cause a data item to be written to persistent storage. Techniques are also provided for managing checkpoints associated with the caches, where the checkpoints are used to determine the position at which to begin processing recovery logs in the event of a failure.
    Type: Grant
    Filed: February 20, 2007
    Date of Patent: April 19, 2011
    Assignee: Oracle International Corporation
    Inventors: Sashikanth Chandrasekaran, Roger J. Bamford, William H. Bridge, David Brower, Neil Macnaughton, Wilson Wai Shun Chan, Vinay Srihari
  • Patent number: 7734580
    Abstract: A standby database system or another replica data system replicates changes, made to data blocks at a source database system or another primary data copy, to replicas of the data blocks at the standby database system or other replica. While replicating the changes to the data blocks thereof, the standby database system (or other replica) receives queries (or reads) issued thereto and computes the queries based on data read from the data blocks thereof.
    Type: Grant
    Filed: January 29, 2007
    Date of Patent: June 8, 2010
    Assignee: Oracle International Corporation
    Inventors: Tirthankar Lahiri, Kiran Goyal, Jia Shi, Wei-Ming Hu, Neil MacNaughton, Jaebock Lee, Bharat Baddepudi, Yunrui Li, J. William Lee, Vipin Gokhale, Mark Dilman, Niloy Mukherjee, Vinay Srihari, Kumar Rajamani, Hochak Hung
  • Patent number: 7702660
    Abstract: In a multi-node database system, a list of data blocks to perform recovery operations on in the event of failure of a given node is dynamically maintained on another node. List is available when the given node fails, and allows the database to be made available more quickly.
    Type: Grant
    Filed: December 12, 2006
    Date of Patent: April 20, 2010
    Assignee: Oracle International Corporation
    Inventors: Wilson Wai Shun Chan, Vinay Srihari, Tak Fung Wang, Tolga Yurek, Angelo Pruscino
  • Patent number: 7627614
    Abstract: Techniques are provided for detecting lost writes so that data corruption can be avoided. According to one technique, lost writes are detected by comparing version numbers that are indicated in redo log entries with version numbers that are indicated in corresponding blocks in a standby database. According to one technique, which may be used in conjunction with the above technique, lost writes are detected by logging read operations that occur relative to a primary database, and comparing version numbers that are indicated in read log entries with version numbers that are indicated in corresponding blocks in a standby database. According to one technique, lost writes are detected by comparing, in response to read operations, (a) version numbers that are stored in a persistent in-memory cache with (b) version numbers that are indicated in corresponding blocks that are read from a primary database.
    Type: Grant
    Filed: March 3, 2005
    Date of Patent: December 1, 2009
    Assignee: Oracle International Corporation
    Inventors: Wei Ming Hu, Mark Dilman, J. William Lee, Juan R. Loaiza, Vinay Srihari
  • Patent number: 7577690
    Abstract: Techniques are provided for managing caches in a system with multiple caches that may contain different copies of the same data item. Specifically, techniques are provided for coordinating the write-to-disk operations performed on such data items to ensure that older versions of the data item are not written over newer versions, and to reduce the amount of processing required to recover after a failure. Various approaches are provided in which a master is used to coordinate with the multiple caches to cause a data item to be written to persistent storage. Techniques are also provided for managing checkpoints associated with the caches, where the checkpoints are used to determine the position at which to begin processing recovery logs in the event of a failure.
    Type: Grant
    Filed: April 17, 2006
    Date of Patent: August 18, 2009
    Assignee: Oracle International Corporation
    Inventors: Sashikanth Chandrasekaran, Roger J. Bamford, William H. Bridge, David Brower, Neil MacNaughton, Wilson Wai Shun Chan, Vinay Srihari
  • Publication number: 20080235291
    Abstract: A standby database system or another replica data system replicates changes, made to data blocks at a source database system or another primary data copy, to replicas of the data blocks at the standby database system or other replica. While replicating the changes to the data blocks thereof, the standby database system (or other replica) receives queries (or reads) issued thereto and computes the queries based on data read from the data blocks thereof.
    Type: Application
    Filed: January 29, 2007
    Publication date: September 25, 2008
    Inventors: Tirthankar Lahiri, Kiran Goyal, Jia Shi, Wei-Ming Hu, Neil MacNaughton, Jaebock Lee, Bharat Baddepudi, Yunrui Li, J. William Lee, Vipin Gokhale, Mark Dilman, Niloy Mukherjee, Vinay Srihari, Kumar Rajamani, Hochak Hung
  • Publication number: 20080140733
    Abstract: In a multi-node database system, a list of data blocks to perform recovery operations on in the event of failure of a given node is dynamically maintained on another node. List is available when the given node fails, and allows the database to be made available more quickly.
    Type: Application
    Filed: December 12, 2006
    Publication date: June 12, 2008
    Applicant: Oracle International Corporation
    Inventors: Wilson Wai Shun Chan, Vinay Srihari, Tak Fung Wang, Tolga Yurek, Angelo Pruscino
  • Patent number: 7296039
    Abstract: Techniques are provided for managing caches in a system with multiple caches that may contain different copies of the same data item. Specifically, techniques are provided for coordinating the write-to-disk operations performed on such data items to ensure that older versions of the data item are not written over newer versions, and to reduce the amount of processing required to recover after a failure. Various approaches are provided in which a master is used to coordinate with the multiple caches to cause a data item to be written to persistent storage. Techniques are also provided for managing checkpoints associated with the caches, where the checkpoints are used to determine the position at which to begin processing recovery logs in the event of a failure.
    Type: Grant
    Filed: October 12, 2004
    Date of Patent: November 13, 2007
    Assignee: Oracle International Corporation
    Inventors: Sashikanth Chandrasekaran, Roger J. Bamford, William H. Bridge, David Brower, Neil MacNaughton, Wilson Wai Shun Chan, Vinay Srihari
  • Publication number: 20070174541
    Abstract: Techniques are provided for managing caches in a system with multiple caches that may contain different copies of the same data item. Specifically, techniques are provided for coordinating the write-to-disk operations performed on such data items to ensure that older versions of the data item are not written over newer versions, and to reduce the amount of processing required to recover after a failure. Various approaches are provided in which a master is used to coordinate with the multiple caches to cause a data item to be written to persistent storage. Techniques are also provided for managing checkpoints associated with the caches, where the checkpoints are used to determine the position at which to begin processing recovery logs in the event of a failure.
    Type: Application
    Filed: February 20, 2007
    Publication date: July 26, 2007
    Inventors: Sashikanth Chandrasekaran, Roger Bamford, William Bridge, David Brower, Neil Macnaughton, Wilson Chan, Vinay Srihari
  • Patent number: RE47106
    Abstract: Each of a plurality of Worker processes are allowed to perform any and all of the following tasks involving logged work items: (1) reading a subset of the work items from a log; (2) sequentially ordering work items for corresponding data objects; (3) applying a sequentially ordered set of work items to a corresponding data object; and (4) transmitting a subset of work items to a Worker process running on another database server in a cluster, if necessary. These tasks can be performed concurrently, at will, and as available, by the Worker processes. An improved checkpointing technique eliminates the need for the Worker processes to get to a synchronization point and stop. Instead, a Coordinator process examines the current state of progress of the Worker processes and computes a past point in the sequence of work items at which all work items before that point have been completely processed, and records this point as the checkpoint.
    Type: Grant
    Filed: February 28, 2014
    Date of Patent: October 30, 2018
    Assignee: Oracle International Corporation
    Inventors: Wei Hu, Yunrui Li, Vinay Srihari, Ramana Yerneni