aggregate query processing in data warehousing

Optimizing Aggregate Query Processing in Cloud Data Warehouses

Sep 02 2014 0183 32 In this paper we study and optimize the aggregate query processing in a highly distributed Cloud Data Warehouse where each database stores a subset of relational data in a star-schema Existing aggregate query processing algorithms focus on optimizing various query...

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Efficient Processin of Queries with Joints and Aggregate

Efficient Processin of Queries with Joints and Aggregate Functions in ROLAP Data Warehousing Environment Efficient processing of expensive queries that include joins and/or aggregate functions is crucial in data warehousing environment since there reside enormous volume of data In this paper we propose a new method for processing of queries that have both of joins and aggregate functions...

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Data Warehousing

Data warehousing is the process of constructing and using a data warehouse A data warehouse is constructed by integrating data from multiple heterogeneous sources that support analytical reporting structured and/or ad hoc queries and decision making Data warehousing involves data cleaning data integration and data...

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Processing Complex Aggregate Queries over Data Streams

sults to user queries while looking at the relevant data items only once and in axed 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 time required by the query...

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Performing Range Aggregate Queries in Stream Data Warehouse

In this paper we present a stream data warehouse cooperating with a network of sensors monitoring utilities consumption We focus on a problem of performing range aggregate queries over the sensors and processing data...

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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...

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Data warehousing query tools

Dec 18 2001 0183 32 Data warehousing query tools Open Aggregate Navigation - Aggregate navigation is the ability to automatically choose pre-stored summaries or aggregates in the course of processing a user s SQL requests Aggregate...

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Data Warehouse Design Techniques

Jul 05 2017 0183 32 Aggregates are to be considered for use when the number of detailed records to be processed is large and/or the processing of the customer queries begins to impact the performance of the BI application Customers of BI applications expect an application which is very responsive to their queri Aggregate Example Data Warehouse...

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NOVEL TECHNIQUES FOR DATA WAREHOUSING AND

aggregate queries on data streams which is to maintain and index a small subset of aggregate cells on a designed data structure Last we extend the data warehousing and OLAP techniques to tackle pattern-based clusters We propose an efficient method to construct a data warehouse of non-redundant pattern-based clusters v...

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How to write these two queries for a simple data warehouse

I am writing a simple data warehouse that will allow me to query the table to observe periodic say weekly changes in data as well as changes in the change of the data eg week to week change in...

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The cube data model a conceptual model and algebra for on

Dec 01 1999 0183 32 It is quite possible for a data warehouse to be hundreds of gigabytes to terabytes in size In this environment aggregated and summarized data are much more important than detailed records The emphasis in data warehousing is on query processing and response times rather than transaction processing...

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Processing Complex Aggregate Queries over Data Streams

sults to user queries while looking at the relevant data items only once and in axed 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 time required by the query processor...

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Approximate query processing in a data warehouse using

Approximate query processing in a data warehouse using random sampling Trong Duc Nguyen Iowa State University Follow this and additional works at https //libdriastateedu/etd Recommended Citation Nguyen Trong Duc Approximate query processing in a data warehouse using random sampling 2020 Graduate Theses and Dissertations 18195...

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How to write these two queries for a simple data warehouse

I am writing a simple data warehouse that will allow me to query the table to observe periodic say weekly changes in data as well as changes in the change of the data eg week to week change in the weekly sale amount For the purposes of simplicity I will present very simplified almost trivialized versions of the tables I am using here...

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Aggregate data warehouse

Aggregates are used in dimensional models of the data warehouse to produce positive effects on the time it takes to query large sets of dataAt the simplest form an aggregate is a simple summary table that can be derived by performing a Group by SQL query...

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SQL for Aggregation in Data Warehouses

Alternatively a data warehouse could have just partial materialization saving storage space but allowing only a subset of possible queries to be answered at highest speed If the queries cover the full range of aggregate groupings possible in its data...

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Use and manage aggregations in Power BI Desktop

Note The Sales Agg table like any table has the flexibility of being loaded in a variety of ways The aggregation can be performed in the source database using ETL/ELT processes or by the M expression for the table The aggregated table can use Import storage mode with or without incremental refresh in Power BI Premium or it can use DirectQuery and be optimized for fast queries...

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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...

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Columnstore indexes

1 Applies to SQL Server 2016 13x SQL Database Premium tiers Standard tiers - S3 and above and all vCore tiers and Parallel Data Warehouse For more information see the Query Processing Architecture Guide Aggregate Pushdown A normal execution path for aggregate computation to fetch the qualifying rows from the SCAN node and aggregate...

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Creating and Modeling Aggregate Tables

Aggregate tables should have fewer rows than the nonaggregate tables and therefore processing should be quicker The aggregate navigation capability of Oracle BI Server allows queries to use the information stored in aggregate tables automatically without query authors or tools having to specify aggregate tables in the queri...

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Deciding equivalences among conjunctive aggregate queries

Apr 01 2007 0183 32 Aggregate query processing in data warehous In Proceedings of the 21st International Conference on Very Large Data Bases Zurich Switzerland Morgan-Kaufmann San...

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Mastering Data Warehouse Aggregates Solutions for Star

Data warehouse expert Chris Adamson shows how a well-planned set of aggregates can have an extraordinary effect on the overall throughput of your data warehouse Regardless of your role or...

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On Index Structures for Star Query Processing in Data

aggregate queries along dimension hierarchies the analysis how the index is used for answering queries in an example data On Index Structures for Star Query Processing in Data Warehouse 5...

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Parallel Processing of Multi

2 Multi-Join Expansion_Aggregate Data Cube Query A Background Data cube aggregate queries normally involved a number of groups based on designated attributes where aggregate functions are carried out in each of the groups Star schemas based on relational databases are often applied to data warehousing ROLAP Relational OLAP...

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Aggregate data warehouse

Aggregate data warehouse Last updated December 21 2019 The basic architecture of a data warehouse Aggregates are used in dimensional models of the data warehouse to produce positive effects on the time it takes to query large sets of dataAt the simplest form an aggregate is a simple summary table that can be derived by performing a Group by SQL query...

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An overview of data warehousing and OLAP technology ACM

Mar 01 1997 0183 32 26 Gupta A Harinarayan V Quass D Aggregate-Query Processing in Data Warehouse Environments Proc of VLDB 1995 Google Scholar Digital Library 27 Chaudhuri S Shim K An Overview of Cost-based Optimization of Queries with Aggregates IEEE Data...

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Efficient Processin of Queries with Joints and Aggregate

Efficient Processin of Queries with Joints and Aggregate Functions in ROLAP Data Warehousing Environment Efficient processing of expensive queries that include joins and/or aggregate functions is crucial in data warehousing environment since there reside enormous volume of data In this paper we propose a new method for processing of queries that have both of joins and aggregate...

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