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AssigneeMicrosoft Technology Licensing, LLC
InventorsHari Krishna Sunder, Sandeep Lingam, Donald Cha, Srikumar Rangarajan
Estimating the term…
Distributed database systems including a plurality of SQL compute nodes are described herein that enable such nodes to operate with versioned metadata despite the fact that SQL is only single-version aware. The distributed database system further includes a global logical metadata server to store and manage versions of metadata, to determine which of such versions should be visible at any given point in time, and enable creation of a virtual database that includes the proper versions of metadata. In an aspect, a central transaction manager manages global transaction identifiers and their associated start times, abort times and/or commit times that enables determination of transaction and metadata version visibility for any point in time. In an aspect, the visible metadata is included in a virtual database that logically overlays a physical database and provides the correct version of metadata in lieu of the current metadata version stored in the physical database.
A distributed database system, comprising:
A method comprising:
A computer program product comprising a computer-readable storage medium having computer program logic recorded thereon that, when executed by a processor, causes the processor to:
Dependencies are inferred from the claim text.