International Business Machines Corporation

Andreas Lohrer

Namik Hrle

Daniel Martin

Matthias Tschaffler

Dispatching a database request. A database request is received. Latency times are determined for databases managed by the DBMS, the latency times being estimates of the times to complete replications from the other databases of all unreplicated data changes in the other databases. For each database, a capture velocity and an apply are determined, which are a number of data changes applied to the database that can be identified or applied in a predefined time interval. For each database, an estimated time to complete the database request is determined. The database request is dispatched to the database having an estimated minimum time of execution of the database request, wherein the time of execution is function of the estimated time for the database to complete the database request, the latency time of the database, and the capture and apply velocities of the database.

Query dispatching system and method

A computer receives a database request to be executed on a source database or a target database. The source database is configured to efficiently process database queries of a first query type, the target database is configured to efficiently process database queries of a second query type, data changes in the source database are asynchronously replicated to the target database, and all changed data in the source database impacting a result of the database request are replicated to the target database before executing the database request. The computer determines a latency time to asynchronously complete a replication of unreplicated data changes and determines a velocity of replication. The computer predicts, using the latency time and velocity of replication, which of the databases will complete an execution of the database request first and dispatches the database request to the database predicted to complete the execution of the database request first.

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Oberviechtach, Germany

Andreas Lohrer