By Hans -Peter Steiert, Jürgen Zimmermann (auth.), Suzanne M. Embury, Nicholas J. Fiddian, W. Alex Gray, Andrew C. Jones (eds.)
This publication constitutes the refereed complaints of the sixteenth British nationwide convention on Databases, BNCOD sixteen, held in Cardiff, Wales, united kingdom, In July 1998.
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Extra info for Advances in Databases: 16th Brirish National Conference on Database BNCOD 16 Cardiff, Wales, UK, July 6–8, 1998 Proceedings
Now, the system crashes before committing ' a / l ' . So, all messages written by transaction ' a / l ' must be removed from the queue. This means that all messages in message state (a/l/S, e, a / l ) are deleted, an operation easily performed using the set-oriented operations of the RDBMS. Undo of dequeue operations is also easy. All messages dequeued by transaction 'b/2' are in message state (a/$/$, d, b/2). Hence, undo is done by updating the message state as shown in (Fig. 6, left) to the new state (a/$/$, c, *).
2 The Layered Approach We consider a three layered approach to designing schemas for DBMS as represented by the three boxes in the middle column of Figure 1. A central point of this work is to allow not only a transparency of the mapping from EER to relational, but also its inverse. Commonly only the forward mapping from the EER to the relational model is considered in the design process. This is insufficient to support general visual browsing with genuine traceability. Appropriate structures must be found for storing this bidirectional interrelationship (Meta-Schema, left column of Figure 1).
I,\ ,P~th, "- - . - ? l-" " . ~' .... Z__ 9 ~un i y p e ::iUD l ype 9 . 4M e m b e r s h z p. , ' "/. C~edon.. i ". " / / i ..... "A" / /\ Fore~n*'-Candklate ~ ~i Pmje~ed Attribute Fig. 2. CDIF-DMOD: overview of objects and relationships foreign keys or supertype/subtype) only for one. CDIF does not provide structures to relate EER objects to relational objects. We circumvent this problem by extending the subject-area to cope with these correspondences as depicted in Figures 3 and 4. Migration rules for implementing primary and foreign relational keys from EER candidate keys are not included in the model, since we rely on the mapping procedure of the S-Designor modeling tool which does not support them.