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External data access with split index

  • US 9,715,515 B2
  • Filed: 01/31/2014
  • Issued: 07/25/2017
  • Est. Priority Date: 01/31/2014
  • Status: Active Grant
First Claim
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1. A method, comprising:

  • creating, by a processor, an index locally in a relational data storage system for data stored external to the relational data storage system in a non-relational data storage system;

    receiving a query, by the relational data storage system, for at least a portion of the data in the non-relational data storage system;

    determining that the index is current with respect to an indexed portion of the data stored external to the relational data storage system, and stale with respect to an updated portion of the data stored external to the relational data storage system;

    identifying, as a first selected data subset, data of the indexed portion that satisfies the query based on the index;

    scanning the updated portion of the data stored external to the relational data storage system to identify a second selected data subset matching the query; and

    returning the first selected data subset and the second selected data subset in response to the query.

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