Expressing and Optimizing Sequence Queries in Database Systems pdf
Expressing and Optimizing Sequence Queries in Database Systems pdf
... determines how far the pattern should be advanced in the input, and ACM Transactions on Database Systems, Vol. 29, No. 2, June 2004. Expressing and Optimizing Sequence Queries in Database Systems •295—next( ... Transactions on Database Systems, Vol. 29, No. 2, June 2004. Expressing and Optimizing Sequence Queries in Database Systems •309WHERE A.PageType <>‘p’ AND X.ccount < 100 AND X.first + 20 Minute ... zero.ACM Transactions on Database Systems, Vol. 29, No. 2, June 2004. Expressing and Optimizing Sequence Queries in Database Systems REZA SADRIProcom Technology Inc., Irvine, CaliforniaCARLO ZANIOLOUCLA...
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Water and energy sustainable management in irrigation systems network
... demand site and flow requirement. 2. Runoff and infiltration from catchments, assuming no irrigation inflow. 3. Inflows and outflows of water for every node and link in the system. This includes ... of simulating operating rules. In AQUATOOL, operating rules are fixed and in WEAP they are defined as a combination of system states and hydrologic conditions. Both AQUATOOL and WEAP include ... decision makers in evaluating water policies and developing sustainable water resource management plans. WEAP operates following the basic principles of water balance accounting and links water supplies...
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An Analysis of Geometric Modeling in Database Systems docx
... Key Words and Phrases: Engineering database systems, geometric modeling, object-oriented database systems INTRODUCTION Motivation The last few years have shown a rapid increase in the use ... engineering database systems investigated in the remainder of this section. 3.1 The (Pure) Relational Database Systems In the introduction to this paper we cited a few reasons why database management ... to use by the database user, that is, the engineer, in order to retrieve and manipulate the data because it requires an intrinsic knowledge of the underlying schema definition. In order to...
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Báo cáo khoa học: "EXPERT SYSTEMS AND OTHER NEW TECHNIQUES IN MT SYSTEMS " ppt
... metho- dology by incorporating advanced techniques from software engineering, moving toward third-genera- tion systems by incorporating expert systems, and returning to interactive techniques ... algebraic and less geometric in nature, and we prefer to use a speci- fication in terms of the kind of structures we are accustomed to manipulating. 2 - Grafting o n expert systems Seeing that linguistic ... to design such a system, and to propose an initial implementation. The expertise to be incorporated in this system includes linguistic, metalinguistic, and extralinguistic knowledge. The system...
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Progressive Skyline Computation in Database Systems potx
... dominance checking, which can be expen-sive if the skyline contains numerous points. In order to speed up this processwe insert the skyline points found in a main-memory R-tree. Continuing ... Skyline Computation in Database Systems •59Fig. 10. Incremental skyline maintenance for insertion.Fig. 11. Incremental skyline maintenance for deletion.skyline (of the whole dataset). In Section ... Enumerating and K -Dominating Queries Enumerating queries return, for each skyline point p, the number of pointsdominated by p. This information provides some measure of “goodness” for theskyline...
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The Case for Determinism in Database Systems doc
... that minimizing superfluous context switches (i.e.avoiding prematurely scheduling threads blocked on mul-tiple contentions) is key to maintaining acceptable perfor-mance in deterministic systems ... shifting between execution models presents anintriguing future avenue of research.3. THE CASE FOR NONDETERMINISMBefore making the case for disallowing nondeterministicbehavior in database systems, ... (“nodes”) and distribute transactional execution across multiple par-titions while maintaining the same interface as a single-node system—is an increasingly important goal for today’sdatabase...
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Query Optimization In Compressed Database Systems pdf
... block-nested-loops, and sort-merge join. Weplan to implement hash join in the future and study its im-pact on our techniques. Queries: We are interested in queries (particularly joins)involving compressed ... Data compression support in databases. In Proc.ofVLDB, pages 695–704, 1994.[20] T. J. Lehman and M. J. Carey. Query processing in main memory database management systems. In Proc.of SIGMOD,, pages ... significant cost during queryprocessing, since there is a tradeoff between the I/O savingsby pushing down a predicate and the extra CPU processingof doing so. Similarly, the pulling up (delaying) of a...
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MauveDB: Supporting Model-based User Views in Database Systems pptx
... raw-temp-readingswhere raw-temp-readings.sensorid = M and timebetween training-start and training-endobservations select * from raw-temp-readingswhere raw-temp-readings.sensorid = M and time > training-endFigure ... handlingincomplete information in databases. In PODS, 1989.[16] S. Grumbach, P. Rigaux, and L. Segoufin.Manipulating interpolated data is easier than youthought. In VLDB, 2000.[17] C. Guestrin, ... Site.http://www-306.ibm.com/software/data/iminer/.[21] T. Imielinski and W. Lipski Jr. Incomplete infor-mation in relational databases. JACM, 31(4), 1984.[22] C. Intanagonwiwat, R. Govindan, and D. Estrin.Directed diffusion:...
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Tài liệu Working through Screens-100 Ideas for Envisioning Powerful, Engaging, and Productive User Experiences in Knowledge Work pdf
... simplifying certain interacon objects make more sense than agging important pieces of informaon within them? Do you have enough informaon to usefully answer these and other envisioning ques-ons? ... your team is striving to mediate?How do the mindsets and constraints inherent in dierent tasks or larger acvies drive work-ers to adopt dierent frameworks for thinking and acng?How might ... envisioning ideas in this book:C1. Intenonal and arculated conceptual modelsC2. Applicaon interacon modelC3. Levels of interacon paernsC4. Pathways for task and acvity based wayndingC5....
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Credit Growth and the Effectiveness of Reserve Requirements and Other Macroprudential Instruments in Latin America pdf
... deposit and lending interest rates. These findings, more generally support the use of RRs as a policy instrument in an inflation-targeting regime in terms of their effectiveness in reinforcing ... measures in Latin America is reported in Table 1. Despite their increasing use, the effectiveness of macroprudential policies in leaning against credit growth and in protecting financial stability ... measure is based on a simple average of rates (in Brazil of demand and savings deposits; in Colombia of checking and saving accounts, CD and bonds, and in Peru the required rate as published by...
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