definition of aggregate query processing

Advanced Database Aggregation Query Processing - CiteSeerX

Processing. Donghui ... The aggregation query is an important but costly operation ... Definition 1. range-temporal aggregation (RTA): given a set of temporal.

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TinyDB: An Acquisitional Query Processing System for Sensor ...

To determine their own level, nodes pick a parent node that is (by definition) .... The basic approach of aggregate query processing in TinyDB is as follows: as...

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Randomized Algorithms for Data Reconciliation in Wide Area ...

Area Aggregate Query Processing∗ ... answering of aggregate queries over data that have been dis- .... a user-defined reconciliation function Rec() that per-.

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Rewriting Aggregate Queries using Description Logic - CEUR-WS

An aggregate query is a query that contains an aggregate function. Aggregate functions ... In this section we define a Description Logic called DLFDE and an object-relational query language ..... Aggregate-query processing in data warehous-.

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Processing Complex Aggregate Queries over Data Streams Cornell

Jun 4, 2002 ... Processing Complex Aggregate Queries over Data Streams. Alin Dobra∗ ..... idea of their scheme is to define a random variable Z that can be.

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Containment of Aggregate Queries∗

aggregate-query containment and equivalence prob- lems. ... variables in A define the conditions appearing in the ...... query processing in data warehouses.

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Aggregate Queries in NoSQL Cloud Data Stores - Globule

Formally, data aggregate queries are defined as functions where the values of .... with data flowing from an online transaction processing database into the data...

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Approximate Query Processing

The importance of region Rj is defined as fj*nj2, where fj is the sum of the weights ... Aggregate queries- SQL-like language, then distributed across the network.

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Aggregate function

In database management an aggregate function is a function where the values of multiple rows are grouped together as input on certain criteria to form a single value of more significant meaning or m...

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Multi-Objective Query Processing for Data Aggregation

We also introduce our techniques in defining query classes for ... in data aggregation systems, the primary query processing task of the mediator is to select.

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Efficient OLAP Query Processing in Distributed Data Warehouses

group definition and aggregate computation, allowing considerable flexibility in the expression of OLAP queries. The processing and optimization of these com-.

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metadata challenge for query processing over heterogeneous - Aircc

operators such as selection, projection, union and aggregation. Advanced research has been ... Section 1 includes query processing definition and related work.

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RPK-table based efficient algorithm for join-aggregate query on ...

May 28, 2016 ... Then we propose an optimization join-aggregate query processing algorithm ... between primary and foreign key is defined as reference table.

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Aggregate Functions - Amazon Redshift - AWS Documentation

Describes the aggregate functions for SQL that Amazon Redshift supports. ... Tutorial: Configuring WLM Queues to Improve Query Processing · Section 1: Understanding the Default Queue ... Creating User-Defined Functions · UDF Constraints...

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Approximate Query Processing Concepts and Techniques | Hend ...

Approximate query processing (AQP) is the best approach for data analysis scenarios ... Histograms, Error Estimation 1 BACKGROUND Query processing definition is ... Thus, running aggregate queries on complete data without reduction...

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Aggregate-Query Processing in Data Warehousing Environments

Feb 1, 1995 ... Processing in Data Warehousing ... tables to help answer aggregate queries has not been .... The tree corresponding to the view definition.

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Efficient Ranking and Aggregate Query Processing in Probabilistic ...

Uncertainty opens the gate to many possible definitions for ranking and aggregate queries. This project systematically examines the underlying properties...

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Top-K Aggregation Queries Over Large Networks - UCSB Computer ...

there is a growing need of processing very standard queries efficiently in ... average aggregation of h-hop neighbors is defined as F(u) = ∑. veSh(u) f(v). |Sh(u)|.

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Query Processing in Sensor Networks

A smart sensor query-processing architecture using database technology can facilitate deployment of ..... a parent node that is (by definition) one level closer to the root .... floor. Figure 3. Sensor network executing a simple aggregate query.

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Convex Optimization for Linear Query Processing under ... - sigkdd

definition (also called approximate differential privacy, explained in Section 2), the ... strategy for processing a batch of arbitrary linear aggregate queries.

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