Navathe, Shamkant B.

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Now showing 1 - 2 of 2
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    Towards Transactional Data Management over the Cloud
    (Georgia Institute of Technology, 2010) Tiwari, Rohan G. ; Navathe, Shamkant B. ; Kulkarni, Gaurav J.
    We propose a consistency model for a data store in the Cloud and work towards the goal of deploying Database as a Service over the Cloud. This includes consistency across the data partitions and consistency of any replicas that exist across different nodes in the system. We target applications which need stronger consistency guarantees than the applications currently supported by the data stores on the Cloud. We propose a cost-effective algorithm that ensures distributed consistency of data without really compromising on availability for fully replicated data. This paper describes a design in progress, presents the consistency and recovery algorithms for relational data, highlights the guarantees provided by the system and presents future research challenges. We believe that the current notions of consistency for databases might not be applicable over the Cloud and a new formulation of the consistency concept may be needed keeping in mind the application classes we aim to support.
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    Minimizing Redundant Work in Lazily Updated Replicated Databases
    (Georgia Institute of Technology, 2000) Omiecinski, Edward ; Navathe, Shamkant B. ; Yee, Wai Gen
    Modern databases which manage lazy (or deferred updates) to clients which subscribe to replicated data do so on a client-by-client basis. They ignore any redundant work done during update processing caused by the commonality in client subscriptions to replicas. This paper proposes a new way to process updates which minimizes this redundancy and results in a reduction of update processing cost at the server in terms of disk space and time consumed in this phase. Ultimately, updates are available quicker, and duration during which clients must enduring stale data is reduced. Results of studies involving, iMobile, a currently available system, are reported, and are extremely encouraging.