1 research outputs found
Transaction execution in multidatabase systems
Ankara : Department of Computer Engineering and Information Science and Institute of Engineering and Science, Bilkent Univ., 1996.Thesis (Master's) -- Bilkent University, 1996.Includes bibliographical references leaves 80-82.Most work in the multiclatabase systems (MDBSs) area has focused on the
issues of transaction management and concurrency control. It is difficult to
implement traditional transaction management techniques in a MDBS due to
the heterogeneity and autonomy of the connected local sites. In this thesis,
we present a new transaction execution model that captures the formalism
and semantics of various extended transaction models and adopts them to a
MDBS environment. The proposed model covers nested transactions, various
dejjendenc}' types among subtransactions, and commit-independent transactions.
The execution model does not make any assumption regarding the concurrency
control protocols executed at the local sites connected to the MDBS.
VVe also present a detailed simulation model of a MDBS to aiiiilyze the
performance of the proposed model. The performances of both the traditional
transaction model and the proposed transaction model are evaluated under
a range of workloads and system configurations. The performance impact of
global transactions’ behavior on local transactions is also discussed.Devirmiş, TimuçinM.S