TITLE:
An Advanced Approach of Local Counter Synchronization to Timestamp Ordering Algorithm in Distributed Concurrency Control
AUTHORS:
Loc Nguyen
KEYWORDS:
Distributed Concurrency Control, Timestamp Ordering Algorithm, Local Counter Synchronization
JOURNAL NAME:
Open Access Library Journal,
Vol.2 No.10,
October
9,
2015
ABSTRACT: Concurrency control is the problem that database management system (DBMS)
meets with difficulties, especially distributed DBMS. There are two main
methods of concurrency control such as locking-based
and timestamp-based. Each method gets involved in its own disadvantages, but locking-based approach is often realized in most
distributed DBMS because its feasibility and strictness lessen danger in distributed environment.
Otherwise, timestamp ordering algorithm is merely implemented in central
DBMS due to the issue of local counter synchronization among sites in
distributed environment. The common solution is broadcasting the message about
the change of local counter (at one site) over distributed network so that all
remaining sites “know” to update their own counters. However, this solution
raises some disadvantages of low performance. So, an advanced approach is
proposed to overcome such disadvantages by giving out another measure so-called
active number that is responsible for harmonizing local counters among
distributed sites. Moreover, another method
is proposed to apply minimum spanning tree into reduce cost of broadcasting
messages over distributed network.