By Hans -Peter Steiert, Jürgen Zimmermann (auth.), Suzanne M. Embury, Nicholas J. Fiddian, W. Alex Gray, Andrew C. Jones (eds.)
This e-book constitutes the refereed lawsuits of the sixteenth British nationwide convention on Databases, BNCOD sixteen, held in Cardiff, Wales, united kingdom, In July 1998.
The eleven revised complete papers awarded including seven posters have been conscientiously chosen for inclusion within the booklet. The papers are geared up in topical sections on middleware, existence cycles, pictures, heterogenity, and languages.
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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Additional resources for Advances in Databases: 16th Brirish National Conference on Database BNCOD 16 Cardiff, Wales, UK, July 6–8, 1998 Proceedings
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Both result from the need to make all messages of a single writer invisible to other transactions, if transaction 'b/2' reads the first message of writer 'a' (Fig. 6, center). Assume transaction '2' of reader 'b' reads message 'a/2/m'. In this case, the VSF of all messages 'a/$/$' is set to 'b/2', making these messages invisible to transactions other than %/2'. Here '$' may be any T or M in 'S/T/M'. If transaction ' a / l ' commits after 'b/2' has read a message %/$/$' from the queue, the state of the message ' a / 1 / n ' enqueued by ' a / l ' is ( a / l / n , c, b/2) instead of (a/l/n, c, *).
Now, the system crashes before committing ' a / l ' . So, all messages written by transaction ' a / l ' must be removed from the queue. This means that all messages in message state (a/l/S, e, a / l ) are deleted, an operation easily performed using the set-oriented operations of the RDBMS. Undo of dequeue operations is also easy. All messages dequeued by transaction 'b/2' are in message state (a/$/$, d, b/2). Hence, undo is done by updating the message state as shown in (Fig. 6, left) to the new state (a/$/$, c, *).