'Query optimizer' presentation slideshows

SQL: The Query Language

562 views • 46 slides

Query Optimization

Query Optimization. CS 157B Ch. 14 Mien Siao. Outline. Introduction Steps in Cost-based query optimization- Query Flow Projection Example Query Interaction in DBMS Cost-based query Optimization: Algebraic Expressions. Introduction. What is Query Optimization?

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Cost-Based Plan Selection Choosing an Order for Joins

Cost-Based Plan Selection Choosing an Order for Joins. Chapter 16.5 and16.6 by:- Vikas Vittal Rao ID: 124/227 Chiu Luk ID: 210. Agenda. Outline Cost Estimation Histograms Computation of statistics Reducing cost of heuristics Enumerating Physical Plans

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Query Optimization

Query Optimization. Query Optimization. The execution cost is expressed as weighted combination of I/O, CPU and communication cost. In earlier distributed query optimizers was ignored that local processing cost such as (I/O, CPU) are also important.

331 views • 19 slides

Query Optimization

Query Optimization. Query Optimization. The execution cost is expressed as weighted combination of I/O, CPU and communication cost. In earlier distributed query optimizers was ignored that local processing cost such as (I/O, CPU) are also important.

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Dive into the Query Optimizer

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Proxy-Server Architectures for OLAP

Proxy-Server Architectures for OLAP. Panos Kalnis, Dimitris Papadias THE HONG KONG UNIVERSITY OF SCIENCE AND TECHNOLOGY. The Problem. Data warehouses: Large repositories of historical summarized information Distributed: Centralized or decentralized. Static structure!

313 views • 15 slides

Proxy-Server Architectures for OLAP

Proxy-Server Architectures for OLAP. Panos Kalnis, Dimitris Papadias THE HONG KONG UNIVERSITY OF SCIENCE AND TECHNOLOGY. The Problem. Data warehouses: Large repositories of historical summarized information Distributed: Centralized or decentralized. Static structure!

166 views • 15 slides

Outline

Outline. SQL Server Optimizer Enumeration architecture Search space: flexibility/extensibility Cost and statistics Automatic Physical Tuning Database Tuning Advisor New Directions. Primary Index. Secondary Index. Running Example (TPC-H Database). Running Example (Query).

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SimpleDB Overview

9/18/2008. SimpleDB Overview. What is SimpleDB?. A basic database system What is has Heapfiles Basic Operators (Scan, Filter, JOIN, Aggregate) ? Buffer Pool Transactions SQL Front-end Things it doesn't have Query optimizer Fancy relational operators (UNION, etc) ? Recovery Indices.

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CompSci 296.2 Self-Managing Systems

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SQL: The Query Language

SQL: The Query Language. R1. Example Instances. S1. We will use these instances of the Sailors and Reserves relations in our examples. S2. SELECT [DISTINCT] target-list FROM relation-list WHERE qualification. Basic SQL Query.

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CS222 /CS122C : Principles of Data Management UCI, Fall 2018 Notes # 14 Open Topics and Wrap up

CS222 /CS122C : Principles of Data Management UCI, Fall 2018 Notes # 14 Open Topics and Wrap up. Instructor: Chen Li. Other indexing techniques. Spatial: R-tree Text: inverted index. R-Tree. Root. R1. R4. Q. R11. R3. R5. R13. R9. R8. R14. R10. R12. R7. R18. R17. R6. R16.

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DB2 Sybase

Applications. User query. APIs. The Kleisli Query Engine Query language Nested relational data model Query optimizer. Metadata. Ontologies Vocabularies. Wrapper. Wrapper. Wrapper. Wrapper. Wrapper. HTML. Flat File. DB2 Sybase. DB1 Oracle. XML. Flat File. HTML. XML.

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Hash-Based Algorithms For Operator Load-Balancing In Database Middleware Systems

Client. Client. DSS 1. DSS 1. Q. Q. R. R. R. R. QSB 1. QSB 1. Q 1. Q 3. R 2. Q 2. R 3. R 1. QSB 2. QSB 2. QSB 3. QSB 3. QSB 4. QSB 4. 6. Q. Q 1. Q. Q 2. Q 3. Q. Project Status. R. R 1. R 2. R. R 3. R. Centralized Query Optimizer. Traditional DBMS Plan.

130 views • 1 slides