Processing Complex Aggregate Queries over Data Streams

sults to user queries while looking at the relevant data items only once and in a fixed order (determined by the stream-arrival pattern). Two key parameters for query processing over continuous data-streams are (1) the amount of memory made available to the on-line algorithm, and (2) the per-item processing timerequired by the query processor.

Aggregate-Query Processing in Data Warehousing ... - VLDB

Aggregate-Query Processing in Data Warehousing Environments* Ashish Gupta Venky Harinarayan Dallan Quass IBM Almaden Research Center Abstract In this paper we introduce generalized pro- jections (GPs), an extension of duplicate- eliminating projections, that capture aggre- gations, groupbys, duplicate-eliminating pro-

Aggregate data faster with approximate query processing ...

Aggregate data faster with approximate query processing. ... Approximate query processing was first seen in Oracle Database 11g when the APPROX_COUNT_DISTINCT function was added, but not documented, to improve the speed when gathering statistics using the DBMS_STATS package; then version 12.2 included the following query processing functions in ...

Query Processing Architecture Guide - SQL Server ...

Query Processing Enhancements on Partitioned Tables and Indexes. SQL Server 2008 improved query processing performance on partitioned tables for many parallel plans, changes the way parallel and serial plans are represented, and enhanced the partitioning information provided in both compile-time and run-time execution plans.

Aggregate Query Processing on Incomplete Data | SpringerLink

Jul 19, 2018· In this paper, we propose to directly estimate the aggregate query result on incomplete data, rather than imputing the missing values. An interval estimation, composed of the upper and lower bound of aggregate query results among all possible interpretation of …

definition of aggregate query processing - aircondi.co.za

Range Aggregate Processing in Spatial Databases - Hong Kong ... Abstract—A range aggregate query returns summarized information about the points falling in a hyper-rectangle (e.g., the total number of ... for example, is defined as sum/count. Holistic ... Aggregate processing of …

Aggregate function - Wikipedia

Decomposable aggregate functions. Aggregate functions present a bottleneck, because they potentially require having all input values at once.In distributed computing, it is desirable to divide such computations into smaller pieces, and distribute the work, usually computing in parallel, via a divide and conquer algorithm.. Some aggregate functions can be computed by computing the aggregate for ...

aggregate query - definition - English - Glosbe

Improved techniques are disclosed for processing data stream queries wherein a data stream is obtained, a set of aggregate queries to be executed on the data stream is obtained, and a query plan for executing the set of aggregate queries on the data stream is generated.

Aggregate-Query Processing in Data Warehousing ...

Aggregate-Query Processing in Data Warehousing Environments Gupta, A. and Harinarayan, V. and Quass, D. (1995) Aggregate-Query Processing in Data Warehousing Environments. In: 21th International Conference on Very Large Data Bases (VLDB …

Clustering Spatial Data for Aggregate Query Processing in ...

In this paper we propose a new Object-oriented HyperGraph-based Clustering (OHGC) approach based on a behavioral walkthrough system that uses traversal patterns to model relationships between users and exploits semantic-based clustering techniques, such as association, intra-relationships, and inter-relationships, to explore additional links ...

Aggregate Function (Report Builder and SSRS) - SQL Server ...

The Aggregate function provides a way to use aggregates that are calculated on the external data source. Support for this feature is determined by the data extension. For example, the SQL Server Analysis Services data processing extension retrieves flattened rowsets from an MDX query.

AQP++: Connecting Approximate Query Processing With ...

trying out all aggregate values as it will increase query processing time significantly. To this end, we propose an efficient aggregate-identification approach. The key idea is to quickly identify a small number of aggregate values whose corresponding queries look similar to the user query and then examine which one is the best only among them.

Foundations of Querying Microsoft SQL Server 2012 ...

Dec 15, 2012· Logical query processing is the conceptual interpretation of the query that defines the correct result, and unlike the keyed-in order of the query clauses, it starts by evaluating the FROM clause. Understanding logical query processing is crucial for …

Aggregate function - Wikipedia

In database management an aggregate function or aggregation function is a function where the values of multiple rows are grouped together to form a single ... or decomposable aggregate functions. ... (OLAP), as they allow aggregation queries to be computed on the pre-computed results in the OLAP cube, rather than on the base data. For ...

Aggregate Query Processing on XML Data - web.ncyu.edu.tw

Many XML query processing techniques have (b) Query been proposed for processing structural joins. These algorithms find all element sets that satisfy the query pattern efficiently. However, sometimes we only need an aggregate value of the final result. Simpler algo-rithms are needed for processing the aggregate operations.

Ad-hoc aggregate query processing algorithms based on bit ...

The paper focuses on proposing ad-hoc aggregate query algorithms based on bit-store. Firstly, the storage model of bit-store including its attribute encoding schemes and bit file organization is introduced. Secondly, different aggregate operations for query processing are presented based on different encoding schemes.

Logical Query Processing in SQL Server - tech-recipes.com

Jan 30, 2017· To learn the basics of SQL Server, you must have an understanding of how an SQL Server query engine executes an SQL query. T-SQL involves both logical and physical query processing. Physical query processing is about how a database engine processes a query. Logical query processing is a conceptual flow, an order of the clauses […]

Processing Aggregate Queries over Continuous Data Streams

Alin Dobra – Processing Aggregate Queries over Continuous Data Streams 20 Binary Sketch Partitioning Breiman’s Theorem[BFOS84]: For q i > 0,r i > 0 and Φ(x) concave, an optimum of

Distinct Aggregation Considered Harmful – Tips, Tricks ...

Sep 22, 2008· The query processing team – query optimization & execution – providing tips, tricks, advice and answers to freqeuently-asked questions in a continued effort to make your queries run faster and smoother in SQL Server. ... Distinct Aggregation Considered Harmful ... Note how the aggregate functions used depend on the initial aggregates: count ...

Probabilistic Threshold Range Aggregate Query Processing ...

Probabilistic Threshold Range Aggregate Query Processing over Uncertain Data Shuxiang Yang∗, Wenjie Zhang+, Ying Zhang∗, and Xuemin Lin+ ∗The University of New South Wales, Australia + The University of New South Wales & NICTA, Australia {syang, zhangw, yingz, …

Approximate Query Processing in Oracle Database 12c ...

Home » Articles » 12c » Here. Approximate Query Processing in Oracle Database 12c Release 2 (12.2) The APPROX_COUNT_DISTINCT function was added, but not documented, in Oracle 11g to improve the speed of calculating the number of distinct values (NDV) when gathering statistics using the DBMS_STATS package. Oracle Database 12c Release 1 (12.1) documented it for the first time, …

definition of aggregate query processing - Mine Equipments

Aggregate-Query Processing in Data Warehousing Environments view definition.Figure 3 is obtained. Using our algorithm for an- swering aggregate queries using materialized aggregate views (see Section 5), we can now ...

Aggregation Pipeline Stages — MongoDB Manual

For aggregation expression operators to use in the pipeline stages, see Aggregation Pipeline Operators. db.aggregate() Stages ¶ Starting in version 3.6, MongoDB also provides the db.aggregate method:

Aggregate Processing of Planar Points - MAFIADOC.COM

Aggregate Processing of Planar Points Yufei Tao, Dimitris Papadias, Jun Zhang Department of Computer Science Hong Kong University of Science and Technology Clear Water Bay, Hong Kong {taoyf, dimitris, [email protected]} Abstract Aggregate window queries return summarized information about objects that fall inside a query rectangle (e.g., the number of objects instead of their concrete ids).

Wolap: Wavelet-based range aggregate query processing

M. JAHANGIRI AND C. SHAHABI 1 WOLAP: Wavelet-Based Range Aggregate Query Processing Mehrdad Jahangiri and Cyrus Shahabi Abstract— The Discrete Wavelet Transform has emerged as Instead, we employed wavelet transform to compact incoming an elegant tool for data analysis queries.

Query Processing Architecture Guide - SQL Server ...

Mar 10, 2015· 3. Aggregate query processing. In this section, we consider aggregate queries with the SQL-syntax presented in Section 1. 3.1. The LCA algorithm: one-phase aggregation. A naive brute-force (BF) algorithm can be designed as follows. All sensor nodes take their readings periodically and keep these readings into their local tables.

Graph Databases for Beginners: A (Brief) Tour of Aggregate ...

Query vs. Processing in NoSQL Aggregate Stores On balance, the similarities between NoSQL aggregate stores are greater than the differences. While each has a different storage strategy, they all share similar characteristics when it comes to querying data. For simple queries, aggregate stores use indexing, basic document linking or a query ...

Logical Query Processing Part 7: GROUP BY and HAVING | IT Pro

Oct 13, 2016· Parts 2, 3, 4 and 5 covered the logical query processing aspects of the first major query clause—the FROM clause. Part 6 covered the second major query clause—the WHERE clause. In this article I continue the series by describing the logical query processing aspects of the third and fourth major query clauses—GROUP BY and HAVING, respectively.

db.collection.aggregate() — MongoDB Manual

Optional. Specifies to return the information on the processing of the pipeline. ... Enables db.collection.aggregate to bypass document validation during the operation. This lets you insert documents that do not meet the validation requirements. ... The query …

Aggregate- Join Query Processing in Parallel Database Systems

Aggregate- Join Query Processing in Parallel Database Systems D. Taniar Department of Computer Science Royal Melbourne Institute of Technology GPO Box 2476V, Melbourne 3001, Australia taniar @ cs.rmit.edu.au Abstract Queries containing aggregate functions ofen combine

SQL Server - Microsoft Tech Community

Query Processing Presentation Craig_Freedman on 03-23-2019 05:21 AM. First published on MSDN on May 15, 2008 Last week, I had the opportunity to talk to the New England SQL Server Users Gro... 77. Conversion and Arithmetic Errors ...

Aggregate-Query Processing in Data Warehousing ...

We develop powerful query rewrite rules for aggregate queries that unify and extend rewrite rules previously known in the literature. We then illustrate the power of our approach by solving a very practical and important problem in data warehousing: how to answer an aggregate query on base tables using materialized aggregate views (summary tables).

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