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Advances in Databases: 16th Brirish National Conference on - download pdf or read online

By Hans -Peter Steiert, Jürgen Zimmermann (auth.), Suzanne M. Embury, Nicholas J. Fiddian, W. Alex Gray, Andrew C. Jones (eds.)

ISBN-10: 3540646590

ISBN-13: 9783540646594

This ebook constitutes the refereed complaints of the sixteenth British nationwide convention on Databases, BNCOD sixteen, held in Cardiff, Wales, united kingdom, In July 1998.
The eleven revised complete papers provided including seven posters have been rigorously chosen for inclusion within the ebook. The papers are geared up in topical sections on middleware, existence cycles, photos, heterogenity, and languages.

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Read or Download Advances in Databases: 16th Brirish National Conference on Database BNCOD 16 Cardiff, Wales, UK, July 6–8, 1998 Proceedings PDF

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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

Example text

If there are operations of uncommitted transactions pending, undo recovery is necessary. There is no need for any redo recovery, because all operations of a queue transaction are reflected in the database after their commit. As messages cannot be changed while they are held under control of the QS and dequeued messages remain in the database until commit, there is no need for logging before-images. Instead, JPMQ writes log entries only for the operations performed upon the queue during a transaction into the log tables.

Today's business applications are developed using objectoriented design methods (3, ll). ode 1 "~ ~ j ~ . ~mp,~ Fig. 1. Metamodel of the JPMQ type system (UML notation) in the design phase is often reflected by the usage of structured data in the implementation. Hence, an adequate representation of data transferred by messages is not a flat byte stream but a structured data type. This leads to the conclusion that the QS should be aware of the structure of the messages stored. In JPMQ, this is obtained by strict typing, which means that a message type is associated with every message.

I Cluster - I\ l . "- "'. : _ ~. % % I 9 uomponant Object I I ','. Constraint'' -. ",-'" ", . I . -'Ve~- - I Relation* --aP~*J~loi+ ship ~ " " - .... to AccessPath "'". ','l% , ,- ,, I \ I ,' ,' / ~ i , ," , ! % ,, ,, 1 Ii ,; . xl~.. Attdbute*', - -~'~- - -- Re/" _ ....... ~ ~" " P ~ y e r 9 ~ -~' ; . ~" I ' , ~ _ Key ~I . '| I.. _. , . , . - , - - ~ .... O b l9e ~ - - ~ - -- ~ ...... /#n 9 -~ ~ c . / , 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.

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Advances in Databases: 16th Brirish National Conference on Database BNCOD 16 Cardiff, Wales, UK, July 6–8, 1998 Proceedings by Hans -Peter Steiert, Jürgen Zimmermann (auth.), Suzanne M. Embury, Nicholas J. Fiddian, W. Alex Gray, Andrew C. Jones (eds.)


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