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With back-in-time debuggers, developers can explore what happened beforeobservable failures by following infection chains back to their root causes.While there are several such debuggers for object-oriented programminglanguages, we do not know of any back-in-time capabilities at thedatabase-level. Thus, if failures are caused by SQL scripts or storedprocedures, developers have difficulties in understanding their unexpectedbehavior.  In this paper, we present an approach for bringing back-in-time debuggingdown to the SAP HANA in-memory database. Our TARDISP debugger allows developersto step queries backwards and inspecting the database at previous and arbitrarypoints in time. With the help of a SQL extension, we can express queriescovering a period of execution time within a debugging session and handle largeamounts of data with low overhead on performance and memory. The entireapproach has been evaluated within a development project at SAP and showspromising results with respect to the gathered developer feedback.

Bringing Back-in-Time Debugging Down to the Database