Existing concurrency control algorithms do not well
conform to various environments, in the performance
perspective. Each algorithm has some assumption on the
conflict characteristic of its execution environment, and
its performance degrades when the assumption fails.
rl per-object hybrid scheme integrating two-phase
locking algorithm with parallel validation technique is
presented to solve this problem. Read and write accesses
on each database object are controlled by one algorithm
at a time. This controlling algorithm can alter during
transactions are running, in order to enhance the overall
system performance. In the simulation studv, proposed
scheme with the proposed algorithm alteration strategy is
shown to well conform to various execution environments,
better than both two-phase locking algorithm and parallel
validation technique.