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Processing Complex Aggregate Queries over Data Streams

be used as the basis for determining the sketch partitions. 2. STREAMS AND RANDOM SKETCHES 2.1 The Stream Data-Processing Model We now briefly describe the key elements of our generic archi-tecture for query processing over continuous data streams (depicted in Figure 1); similar architectures for stream processing have been).

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Processing Data-Stream Join Aggregates Using Skimmed

Processing Data-Stream Join Aggregates Using Skimmed Sketches Sumit Ganguly, Minos Garofalakis, and Rajeev Rastogi Bell Laboratories, Lucent Technologies, Murray Hill NJ, USA. sganguly,minos,rastogi @research.bell-labs Abstract. There is a growing interest in on-line algorithms for analyzing and

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New Technologies for Approximate Query Processing

Sketch based Aproximate Query Processing. AGMS sketches are an interesting approximation technique that consist in combining +-1 pseudo random numbers with the data in a manner that allows computation of aggregates. Our contributions to this research area are:

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Processing Complex Aggregate Queries over Data Streams

• SKETCH-BASED APPROXIMATE PROCESSING ALGORITHMS FOR COMPLEX AGGREGATE QUERIES. We show how small, sketch synopses for data streams can be used to compute provably-accurate approximate answers to aggregate multi-join queries. Our tech- niques extend and generalize the earlier results of Alon et al. [3, 2] in two important respects.

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Processing Complex Aggregate Queries over Data Streams

• Sketch-based approximation of aggregate queries results • Sketch-partitioning for estimation accuracy boosting • Experimental evaluation • Summary Dobra, Garofalkis, Gehrke and Rastogi – Processing Aggregate Queries over Streams 10

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aggregate and sand processing sketch diagram

Emission Factor Documentation for AP-42 Section 11.19.1 Sand . 2-1 Process flow diagram for construction sand and gravel processing ... is as aggregate for the ... After processing, the sand is transported to storage bins or.

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Augmented Sketch: Faster and More Accurate Stream Processing

Our solution, called Augmented Sketch (ASketch), is based on a pre-filtering stage that dynamically identifies and aggregates the most frequent items. Items overflowing the pre-filtering stage are processed using a conventional sketch algorithm, thereby making the solution general and applicable in a wide range of contexts.

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Robust Approximate Aggregation in Sensor Data

—We extend well-knownduplicate insensitive sketches[Flajoletand Martin 1985]to handle SUM aggregates. We present a new algorithm that improves the insertion time of a new item ci into the sketch from O(log2 ci) to O(logci). Furthermore, our algorithm can work on small sensor devices with low-performance hardware.

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Aggregate Processing / Sand / Material / Build Install ...

Aggregate Processing - an expertise to design, build and install aggregate processing plants to handle and process all types of material, sand aggregates. Tel: +44 (0) 1782 566523 [email protected] duoplc. Material Handling / Engineering Design, Fabrication and Installation

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Processing Data-Stream Join Aggregates Using Skimmed Sketches

Processing Data-Stream Join Aggregates Using Skimmed Sketches. Download. Processing Data-Stream Join Aggregates Using Skimmed Sketches. Sumit Rastogi. Related Papers. Sketch techniques for approximate query processing. By M. Tamer Özsu. Survey on Query Estimation in Data Streams.

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Processing Complex Aggregate Queries over Data Streams

be used as the basis for determining the sketch partitions. 2. STREAMS AND RANDOM SKETCHES 2.1 The Stream Data-Processing Model We now briefly describe the key elements of our generic archi-tecture for query processing over continuous data streams (depicted in Figure 1); similar architectures for stream processing have been).

Read More
Moment-based quantile sketches for efficient aggregation ...

Aug 29, 2018  To illustrate the impact the moments sketch can have on production data systems, we implemented the sketch as a custom user defined aggregate and incorporated it into a Druid deployment. When computing a quantile query requiring 10 million merges, the default streaming-histogram sketch in Druid 0.11 provides 12 second query times.

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Spatio-Temporal Aggregation Using Sketches

only one sketch that is randomly selected from the m sketches (i.e., thus the processing cost is still O(1)). As a result, each sketch is responsible for approximately n/m (distinct) objects, and this is reflected in the modified estimation formula. Specifically, given

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Processing Data-Stream Join Aggregates Using Skimmed Sketches

Processing Data-Stream Join Aggregates Using Skimmed Sketches. March 2004. DOI: 10.1007/978-3-540-24741-8_33. Source. DBLP. Conference: Advances in Database Technology - EDBT 2004, 9th ...

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Processing Complex Aggregate Queries over Data Streams

• Sketch-based approximation of aggregate queries results • Sketch-partitioning for estimation accuracy boosting • Experimental evaluation • Summary Dobra, Garofalkis, Gehrke and Rastogi – Processing Aggregate Queries over Streams 10

Read More
Processing Complex Aggregate Queries over Data Streams

• SKETCH-BASED APPROXIMATE PROCESSING ALGORITHMS FOR COMPLEX AGGREGATE QUERIES. We show how small, sketch synopses for data streams can be used to compute provably-accurate approximate answers to aggregate multi-join queries. Our tech- niques extend and generalize the earlier results of Alon et al. [3, 2] in two important respects.

Read More
Robust Approximate Aggregation in Sensor Data

scribed in Section 2.1. Previous frameworks for processing aggregates are cov-ered in 2.2, and multipath routing techniques are covered in 2.3. Finally, the sketches which we use to improve upon these frameworks are introduced in Section 2.4. 2.1 Sensor Devices Today’s sensor motes (e.g., Horton et al. [2002]) are full-fledged computer sys-

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Proof Sketches: Verifiable Multi-Party Aggregation

γ(σpred(R)), where γis an aggregate function, σpred is a selection operator, and R is a set of values. We develop logarithmic-sized proof sketches for a broad class of count aggregates, and prove that they detect tampering beyond a small factor of the true count. We extend that scheme to develop compact proof sketches for verifi-

Read More
Robust Approximate Aggregation in Sensor Data

—We extend well-knownduplicate insensitive sketches[Flajoletand Martin 1985]to handle SUM aggregates. We present a new algorithm that improves the insertion time of a new item ci into the sketch from O(log2 ci) to O(logci). Furthermore, our algorithm can work on small sensor devices with low-performance hardware.

Read More
Services - Mueller Aggregate Processing Solutions LLC

At Mueller Aggregate Processing Solutions LLC, I’m here to assist you in the areas of design, application, and AggFlow simulation. I specialize in working on plant efficiencies and plant balance. As your consultant, you can also rely on me to identify any problems with your plant processes and provide you with solutions for all your ...

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Sketch-Based Multi-Query Processing over Data Streams ...

Jul 12, 2016  A. Dobra, M. Garofalakis, J. Gehrke, R. Rastogi, Processing complex aggregate queries over data streams, in Proc. of the 2002 ACM SIGMOD Intl. Conference on Management of Data, Madison, Wisconsin (2002), pp. 61–72 CrossRef Google Scholar

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StrokeAggregator: Consolidating Raw Sketches into Artist ...

Given such sketches, human observers can readily envision the intended aggregate curves, and can mentally assemble the artist’s envisioned 2D imagery. Algorithmic stroke consolidation—replacement of overdrawn stroke clusters by corresponding aggregate curves—can benefit a range of sketch processing and sketch-based modeling applications ...

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aggregate and sand processing sketch diagram

Emission Factor Documentation for AP-42 Section 11.19.1 Sand . 2-1 Process flow diagram for construction sand and gravel processing ... is as aggregate for the ... After processing, the sand is transported to storage bins or.

Read More
Moment-based quantile sketches for efficient aggregation ...

Aug 29, 2018  To illustrate the impact the moments sketch can have on production data systems, we implemented the sketch as a custom user defined aggregate and incorporated it into a Druid deployment. When computing a quantile query requiring 10 million merges, the default streaming-histogram sketch in Druid 0.11 provides 12 second query times.

Read More
Processing Data-Stream Join Aggregates Using Skimmed Sketches

Processing Data-Stream Join Aggregates Using Skimmed Sketches. March 2004. DOI: 10.1007/978-3-540-24741-8_33. Source. DBLP. Conference: Advances in Database Technology - EDBT 2004, 9th ...

Read More
Proof Sketches: Verifiable Multi-Party Aggregation

γ(σpred(R)), where γis an aggregate function, σpred is a selection operator, and R is a set of values. We develop logarithmic-sized proof sketches for a broad class of count aggregates, and prove that they detect tampering beyond a small factor of the true count. We extend that scheme to develop compact proof sketches for verifi-

Read More
Robust Approximate Aggregation in Sensor Data

scribed in Section 2.1. Previous frameworks for processing aggregates are cov-ered in 2.2, and multipath routing techniques are covered in 2.3. Finally, the sketches which we use to improve upon these frameworks are introduced in Section 2.4. 2.1 Sensor Devices Today’s sensor motes (e.g., Horton et al. [2002]) are full-fledged computer sys-

Read More
Robust Approximate Aggregation in Sensor Data

—We extend well-knownduplicate insensitive sketches[Flajoletand Martin 1985]to handle SUM aggregates. We present a new algorithm that improves the insertion time of a new item ci into the sketch from O(log2 ci) to O(logci). Furthermore, our algorithm can work on small sensor devices with low-performance hardware.

Read More
Approximate Aggregation Techniques for Sensor Databases

tention paid to efficient query processing for aggregate queries [15, 20, 23]. In the TAG system [15], users connect to the sen-sor network using a workstation or base station directly connected to a sensor designated as the sink. Aggregate queries over the sensor data are formulated using a sim-ple SQL-like language, then distributed across ...

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Sketching and Streaming Algorithms for Processing

for processing such large amounts of data: the external memory model [3, 21] ... sketches. A sketch is with respect to some function f, and a sketch of a ... to compute some function of the aggregate data, or similarity or di erence measures across di erent data sets.

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Accuracy vs. Lifetime: Linear Sketches for Aggregate ...

Accuracy vs. Lifetime: Linear Sketches for Aggregate Queries in Sensor Networks ... of the processing power of the sensors to aggregate the data from different nodes as it gets forwarded to the base–station, thereby reducing the communication costs greatly.

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[PDF] StrokeAggregator: consolidating raw sketches into ...

Given such sketches, human observers can readily envision these intended, aggregate, curves, and mentally assemble the artist's envisioned 2D imagery. Algorithmic stroke consolidation---replacement of overdrawn stroke clusters by corresponding aggregate curves---can benefit a range of sketch processing and sketch-based modeling applications ...

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Enterprise Integration Patterns - Aggregator

A Splitter is useful to break out a single message into a sequence of sub-messages that can be processed individually. Likewise, a Recipient List or a Publish-Subscribe Channel is useful to forward a request message to multiple recipients in parallel in order to get multiple responses to choose from. In most of these scenarios, the further processing depends on successful processing of the sub ...

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CONSTRUCTION AND ACCEPTANCE TESTING OF SUBGRADE

VDOT Soils and Aggregate Compaction ... lead to significant damage to the pavement. If the pavement is thick, as shown in the left hand sketch, the stress imposed by the traffic load through the pavement is distributed over a large area, making for low stresses on the ...

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aggregate processing and properties

aggregate processing plant design in malaysia; aggregate quarry processing equipment; aggregate processing and road construction equipment; aggregate mineral processing methods; Aggregate Crushing Plant And Processing; vacuum processing plant for aggregate; Aggregate And Sand Processing Sketch Diagram; aggregate processing solutions careers; jv ...

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Terms of Service Sketch

May 02, 2021  To the maximum extent permitted by applicable law, the total aggregate liability of Sketch B.V., its Affiliates, personnel, subcontractors, agents or any third party that has been involved in the creation, production, or delivery of the Sketch Platform for all damages arising out of or in any way relating to the Sketch Platform, shall in no ...

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Aggregate query processing in the presence of duplicates ...

Mar 10, 2015  Considine et al. presented a robust method using FM sketch and multi-path routing for processing approximate aggregate queries in the presence of failures. Shrivastava et al. [25] developed the q-digest structure to support approximate processing for quantile queries.

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