Talks and Poster Presentations (with Proceedings-Entry):
V. Savenkov, R. Pichler, C. Koch:
"Loop Elimination for Database Updates";
Talk: 29th British National Conference on Databases, BNCOD 2013,
- 07-10-2013; in: "Big Data - 29th British National Conference on Databases, BNCOD 2013, Oxford, UK, July 8-10, 2013. Proceedings",
G. Gottlob, G. Grasso, D. Olteanu, C. Schallhart (ed.);
The additional expressive power of procedural extensions of query and update languages come at the expense of trading the efficient set-at-a-time processing of database engines for the much less efficient tuple-at-a-time processing of a procedural language. In this work, we consider the problem of rewriting for-loops with update statements into sequences of updates which do not use loops or cursors and which simultaneously carry out the action of several loop iterations in a set-at-a-time manner. We identify idempotence as the crucial condition for allowing such a rewriting. We formulate concrete rewrite rules for single updates in a loop and extend them to sequences of updates in a loop.
Database updates, Update loops, Query translation
"Official" electronic version of the publication (accessed through its Digital Object Identifier - DOI)
Electronic version of the publication:
Project Head Reinhard Pichler:
Heterogene Information Integration
Created from the Publication Database of the Vienna University of Technology.