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Crowd op query optimization for declarative crowdsourcing systems

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Crowd op query optimization for declarative crowdsourcing systems

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Crowd op query optimization for declarative crowdsourcing systems

  1. 1. Do Your Projects With Domain Experts… Copyright © 2015 LeMeniz Infotech. All rights reserved LeMeniz Infotech 36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue, Pondicherry-605 005. Call: 0413-4205444, +91 9566355386, 99625 88976. Web : www.lemenizinfotech.com / www.ieeemaster.com Mail : projects@lemenizinfotech.com CrowdOp: Query Optimization for Declarative Crowdsourcing Systems Abstract Query optimization problem in declarative crowdsourcing systems. Declarative crowdsourcing is designed to hide the complexities and relieve the user of the burden of dealing with the crowd. The user is only required to submit an SQL-like query and the system takes the responsibility of compiling the query, generating the execution plan and evaluating in the crowdsourcing marketplace. A given query can have many alternative execution plans and the difference in crowdsourcing cost between the best and the worst plans may be several orders of magnitude. Therefore, as in relational database systems, query optimization is important to crowdsourcing systems that provide declarative query interfaces. In this paper, we propose CROWDOP, a cost-based query optimization approach for declarative crowdsourcing systems. CROWDOP considers both cost and latency in query optimization objectives and generates query plans that provide a good balance between the cost and latency. We develop efficient algorithms in the CROWDOP for optimizing three types of queries: selection queries, join queries, and complex selection-join queries. We validate our approach via extensive experiments by simulation as well as with the real crowd on Amazon Mechanical Turk. EXISTING SYSTEM A given query can have many alternative execution plans and the difference in crowdsourcing cost between the best and the worst plans may be several orders
  2. 2. Do Your Projects With Domain Experts… Copyright © 2015 LeMeniz Infotech. All rights reserved LeMeniz Infotech 36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue, Pondicherry-605 005. Call: 0413-4205444, +91 9566355386, 99625 88976. Web : www.lemenizinfotech.com / www.ieeemaster.com Mail : projects@lemenizinfotech.com of magnitude. Therefore, as in relational database systems, query optimization is important to crowdsourcing systems that provide declarative query interfaces. DRAWBACK OF EXISTING SYSTEM  Execution plan has a significant impact on overall performance.  It includes the number of questions being asked.  The types/difficulties of the questions and the monetary cost incurred. PROPOSED SYSTEM Declarative crowdsourcing is designed to hide the complexities and relieve the user of the burden of dealing with the crowd. So we propose CROWDOP, a cost-based query optimization approach for declarative crowdsourcing systems. ADVANTAGE OF PROPOSED SYSTEM  Cost and latency in query optimization objectives and generates query plans that provide a good balance between the cost and latency.  Collect the answers.  Handle errors and resolve the inconsistencies in the answers. SYSTEM SPECIFICATION Hardware Requirements System : Pentium IV 2.4 GHz Hard Disk : 40 GB
  3. 3. Do Your Projects With Domain Experts… Copyright © 2015 LeMeniz Infotech. All rights reserved LeMeniz Infotech 36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue, Pondicherry-605 005. Call: 0413-4205444, +91 9566355386, 99625 88976. Web : www.lemenizinfotech.com / www.ieeemaster.com Mail : projects@lemenizinfotech.com Floppy Drive : 1.44 Mb Monitor : 15 VGA Colour Mouse : Logitech Ram : 512 Mb Software Requirements Operating system : Windows Family Tools : eclipse/Netbeans Technology Used : Java Backend Used : SQL Server

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