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<p><it>Abstract</it>—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.</p>
Algorithms, concurrency control, database management, global reads, locking, long-lived transactions, and transaction processing.

S. Jajodia, P. Ammann and P. Mavuluri, "On-The-Fly Reading of Entire Databases," in IEEE Transactions on Knowledge & Data Engineering, vol. 7, no. , pp. 834-838, 1995.
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