By Thomas Gustafsson.
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Further, Bernstein et al. have shown that 2V2PL is view-serializable [9]. , the effect of execution of transactions is as an execution of the transactions in sequence. One benefit or using serializability as a correctness criterion, as pointed out by Graham [21], is that it is easy to reason about the execution of transactions in sequence. , serializability might exclude execution orderings of operations that make sense for the application. Thus, the performance of the system can be increased by relaxing the serialization as correctness criterion.
Air pressure sensor, lambda sensor in the catalyst, and engine temperature sensor. Control loops in the EECU software derive values that are sent to actuators, which are the means to control the engine. Examples of actuator signals are fuel injection times that determine the amount of fuel injected into a cylinder and ignition time that determines when the air/fuel mixture should be ignited. , they have deadlines, thus, an EECU is a real-time system. All calculations are executed in a best effort way meaning that a calculation that has started executes until it is finished.
If the data item is already locked and the new requested lock conflicts with it, then the operation is delayed until the conflicting lock is released. Otherwise, the data item is locked and the operation is accepted. 2. When the TO scheduler has set a lock for a transaction, the TO scheduler may not release the lock until the database module acknowledges that it has processed the corresponding operation. 3. When the TO scheduler has released one lock it may not acquire anymore locks for this transaction.