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@inproceedings{DBLP:conf/sigmod/HwangLYMMGCSS94,
author = {San-Yih Hwang and
Ee-Peng Lim and
H.-R. Yang and
S. Musukula and
K. Mediratta and
M. Ganesh and
Dave Clements and
J. Stenoien and
Jaideep Srivastava},
editor = {Richard T. Snodgrass and
Marianne Winslett},
title = {The MYRIAD Federated Database Prototype},
booktitle = {Proceedings of the 1994 ACM SIGMOD International Conference on
Management of Data, Minneapolis, Minnesota, May 24-27, 1994},
publisher = {ACM Press},
year = {1994},
pages = {518},
ee = {http://doi.acm.org/10.1145/191839.191986, db/conf/sigmod/sigmod94-518.html},
crossref = {DBLP:conf/sigmod/94},
bibsource = {DBLP, http://dblp.uni-trier.de}
}
BibTeX
An implementation of Myriad has been realized in the UNIX environment on a network of Sun SPARCstations. Currently, we have built gateways on two local DBMSs, namely Oracle and Postgres. To demonstrate the essential features of database integration in Myriad, we constructed several example databases on both Oracle and Postgres such that relations from these databases are merged into integrated relations using relational operations as well as user-defined integration functions. All programs are written in C and embedded query languages. The Myriad communication process is implemented using the BSD socket libraries.
The essential functionalities of all query processing components have been implemented. A simple query optimization strategy has been adopted to evaluate global SQL queries. A full-fledged query optimization is currently being developed and implemented.
We have implemented a Myriad transaction management subsystem that supports the general transaction model. Presently, each integrated local DBMS employs two-phase locking (2PL). The transaction management components support two-phase commit over local DBMSs so as to achieve serializable execution. With respect to the global deadlock problem, Myriad uses a timeout mechanism to resolve it. A timeout period is associated with each local query submitted to the gateway. If the result of a local query does not return within the timeout period, the entire global transaction is assumed to be involved in a global deadlock and is aborted.
At the application tool level, an easy-to-use query interface has been implemented. This allows federation users and DBAs to browse/modify/create federated schemas and pose transaction as well as query requests to the Myriad system.
Copyright © 1994 by the ACM, Inc., used by permission. Permission to make digital or hard copies is granted provided that copies are not made or distributed for profit or direct commercial advantage, and that copies show this notice on the first page or initial screen of a display along with the full citation.
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