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Reduced Disk Space Standby

  • US 20120054158A1
  • Filed: 08/30/2010
  • Published: 03/01/2012
  • Est. Priority Date: 08/30/2010
  • Status: Active Grant
First Claim
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1. A computer-implemented method, comprising:

  • a main standby database system applying changes to standby database files that were received from a primary database system;

    in response to applying changes, advancing an established logical time for computing queries to a particular logical time;

    sending to one or more subsidiary standby database systems said particular logical time, wherein said one or more subsidiary standby database systems do not apply said changes to said standby database files; and

    while said standby database system is applying said changes to said standby database files;

    receiving a query issued to a subsidiary standby database system of the one or more subsidiary database systems; and

    said subsidiary standby database system computing results for said query that are consistent with said particular logical time based on data read from said standby database files;

    wherein each of the above steps is performed by one or more computing devices.

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