NDLI: Processing operations with restrictions in RDBMS without external sorting: the Tetris algorithm

Content Provider	IEEE Xplore Digital Library
Author	Markl, V. Zirkel, M. Bayer, R.
Copyright Year	1999
Description	Author affiliation: Bayerisches Forschungszentrum fur Wissensbasierte Syst., Munchen, Germany (Markl, V.)
Abstract	Most operations of the relational algebra or SQL require a sorted stream of tuples for efficient processing. Therefore, processing complex relational queries relies on efficient access to a table in some sort order. In principle, indexes could be used, but they are superior to a full table scan only if the result set is sufficiently restricted in the index attribute. We present the Tetris algorithm, which utilizes restrictions to process a table in sort order of any attribute without the need for external sorting. The algorithm relies on the space partitioning of a multidimensional access method. A sweep line technique is used to read data in sort order of any attribute, while accessing each disk page of a table only once. Results are produced earlier than with traditional sorting techniques allowing better response times for interactive applications and pipelined processing of the result set. We describe a prototype implementation of the Tetris algorithm using UB-Trees on top of Oracle 8, define a cost model and present performance measurements for some queries of the TPC-D benchmark.
Starting Page	562
Ending Page	571
File Size	209100
Page Count	10
File Format	PDF
ISBN	0769500714
ISSN	10636382
DOI	10.1109/ICDE.1999.754972
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1999-03-23
Publisher Place	Australia
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Sorting Multidimensional systems Relational databases Indexes Query processing Ear Delay Prototypes Costs Warehousing
Content Type	Text
Resource Type	Article

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