TI An Object-Based Approach to Implementing Distributed
Concurrency Control 

LT CUCS-051-90 

OR COLUM 

YR 1990 

AU Steven S. Popovich 

AU Gail E. Kaiser 

AU S.F. Wu 

AV ftp cs.columbia.edu:pubreportsreports-1990cucs-051-90.ps.Z 

AB We have added distributed concurrency control to the MELD
object system by representing in-progress transactions as
simulated objects. {\em Transaction objects} exploit MELD's
normal message passing facilities to support the concurrency
control mechanism.  We have completed the implementation of an
optimistic mechanism using transaction objects and have designed
a two-phase locking mechanism based on the same paradigm.  We
discuss the tradeoffs made and lessons learned, dealing both with
transactions {\em on} objects and with transactions {\em as}
objects.