Performance of concurrency control methods in multidatabase system

Recently, a number of concurrency control algorithms have been proposed for multidatabase system (MDBS) concurrency control methods (CCMs) and the most challenging issue of them has been a concern about how to ensure global serializability (GSR). In this paper, we examine two concurrency control algorithms of MDBS through simulation approach: optimistic ticket method (OTM) and global ticket method(GTM). In historical note, OTM is known to be the first practical solution, since this approach ensures GSR by way of automatically resolving indirect conflicts among global transactions without making any restrictions on local CCMs. However, OTM is expected to yield poor performance since it enforces all global transactions to take a local ticket which causes direct conflicts between them. In GTM, the global transaction manager in an MDBS assigns a global ticket to global transactions rather than accessing a local ticket as in OTM. Our experimental results showed that GTM outperforms OTM in cases that short timeout values are given. However, in case that the timeout value relatively becomes long, our results demonstrated that OTM outperforms GTM.
Publisher
IEICE-INST ELECTRON INFO COMMUN ENG
Issue Date
1996-04
Language
ENG
Citation

IEICE TRANSACTIONS ON INFORMATION AND SYSTEMS, v.E79D, no.4, pp.321 - 332

ISSN
0916-8532
URI
http://hdl.handle.net/10203/4191
Appears in Collection
KGSM-Journal Papers(저널논문)
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