Abstract
In order to recover data from embedded real-time main memory databases effectively and efficiently, this paper proposes a real-time log-based recovery approach. With respect to the real-time requirement in embedded systems, we classify the consistency in real-time main memory databases into data and transaction consistencies, analyze them theoretically, design rules for correct recovery strategy, and propose real-time log-based recover algorithms for different types of transactions. The experiments show that the proposed approach is more effective and efficient than methods in both traditional and eXtremeDB database systems.
Highlights
In order to recover data from embedded real-time main memory databases effectively and efficiently, this paper proposes a real-time log-based recovery approach
These strategies only take the requirement of real-time into consideration, and ignore other specific requirements in embedded systems, so they cannot be applied to the embedded environment efficiently
3 Rules for correct recovery strategy Taking the internal consistency and time consistency of transactions and data in embedded real-time main memory databases into consideration, we present some rules for correct recovery strategies
Summary
In order to recover data from embedded real-time main memory databases effectively and efficiently, this paper proposes a real-time log-based recovery approach. With respect to the real-time requirement in embedded systems, we classify the consistency in real-time main memory databases into data and transaction consistencies, analyze them theoretically, design rules for correct recovery strategy, and propose real-time log-based recover algorithms for different types of transactions. The logs in embedded systems record the behaviors of embedded systems, and researchers use different logs to design different recovery strategies, such as partition log [14], real-time log [15], remote log [16], and operation log [17] These strategies only take the requirement of real-time into consideration, and ignore other specific requirements in embedded systems, so they cannot be applied to the embedded environment efficiently. 2.1 Data consistency The embedded real-time main memory databases include three types of data, i.e., image objects, derived objects, and invariant objects
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