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On-the-fly reading of entire databases

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3 Author(s)
Ammann, P. ; Dept. of Inf. & Software Syst. Eng., George Mason Univ., Fairfax, VA, USA ; Jajodia, S. ; Mavuluri, P.

A common database need is to obtain a global-read, which is a consistent read of an entire database. To avoid terminating normal system activity, and thus improve availability, we propose an on-the-fly algorithm that reads database entities incrementally and allows normal transactions to proceed concurrently. The algorithm assigns each entity a color based on whether the entity has been globally read, and a shade based on how normal transactions have accessed the entity. Serializability of execution histories is ensured by requiring normal transactions to pass both a color test and a shade test before being allowed to commit. Our algorithm improves on a color-only-based scheme from the literature; the color-only scheme does not guarantee serializability

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Knowledge and Data Engineering, IEEE Transactions on  (Volume:7 ,  Issue: 5 )