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Introducing Snapshots to Database Pointer Transactions


Publication Type:

Report - MRTC




We present 2V-DBP-SNAP, an algorithm that allow hard real-time tasks in an embedded real-time control system to read a snapshot of a number of data elements in a real-time database. Furthermore, 2V-DBP-SNAP allows these data elements to be shared with soft real-time tasks, which access them using a database query language, and with other hard real-time tasks that use database pointers. 2V-DBP-SNAP allows temporal behavior and memory consumption to be accurately predicted. Introducing snapshot transactions is beneficial for embedded control-systems, such as for engine control in an automotive system, since a snapshot of the state of the environment can be collected, e.g., the state of all cylinders in the engine. 2V-DBP-SNAP is lightweight and predictable, both with respect to computational and memory overhead, and is therefore highly suited for resource constrained systems.


author = {Dag Nystr{\"o}m and Mikael Sj{\"o}din and Christer Norstr{\"o}m},
title = {Introducing Snapshots to Database Pointer Transactions},
number = {ISSN 1404-3041 ISRN MDH-MRTC-175/2005-1-SE},
month = {April},
year = {2005},
url = {}