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Belford, Geneva G. Shi, Shaw-Ben 2011-05-07T12:44:30Z 2011-05-07T12:44:30Z 10000-01-01 1990 This thesis addresses the issue of ensuring user programs to be executed reliably by making use of the idle resources provided by the workstation environment. In particular, we examine how to replicate user programs so that user programs can continue to work in the face of system failures. We present a paradigm of replication called replicated transaction. In our system, a user computation is cast as an atomic transaction. A transaction is executed as several concurrent and independent copies. The replicated transaction approach has one serious problem: different transaction replicas might behave differently. This thesis identifies the reasons why transaction replicas behave differently. We present the necessary algorithms for ensuring transaction replicas to behave consistently. The algorithms include a multi-level concurrency control scheme, a token based message ordering protocol and a primary copy scheme. We also provide a formal model with which to prove the correctness of our concurrency control scheme and how our algorithms can ensure transaction replicas to behave consistently. We have written a simulation program to model the replicated transaction system. The simulation program is written in C++ and uses an event-driven simulation package, CSIM. Made available in DSpace on 2011-05-07T12:44:30Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9114411.pdf: 5090055 bytes, checksum: dbcfa86af40e0e563901e1b559a36221 (MD5) Previous issue date: 1990 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:45:08Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:19:57-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission ETDs are only available to UIUC Users without author permission U of I Only AAI9114411 (UMI)AAI9114411 http://hdl.handle.net/2142/20621 eng Copyright 1990 Shi, Shaw-Ben Computer Science Building reliable programs through active replication text Computer Science Computer Science University of Illinois at Urbana-Champaign Dissertation Ph.D.