'Index scan' presentation slideshows

941 views • 71 slides

Chapter 15: Query Processing

Chapter 15: Query Processing. Chapter 15: Query Processing. Overview Measures of Query Cost Selection Operation Sorting Join Operation Other Operations Evaluation of Expressions. Basic Steps in Query Processing. 1. Parsing and translation 2. Optimization 3. Evaluation.

869 views • 59 slides

Chapter 15: Query Processing

Chapter 15: Query Processing. Chapter 15: Query Processing. Overview Measures of Query Cost Selection Operation Sorting Join Operation Other Operations Evaluation of Expressions. Basic Steps in Query Processing. 1. Parsing and translation 2. Optimization 3. Evaluation.

637 views • 59 slides

Oracle SQL Tuning

http://www.peerlabs.com. Oracle SQL Tuning. Presented By Akin S Walter-Johnson Ms Principal PeerLabs, Inc. Email akin@peerlabs.com. SCOPE. How data is accessed and reconstituted joins Inform the user on how identify problems with SQL Repair of SQL Tuning can occur at 2 levels

1.13k views • 45 slides

An Insiders View of How the Optimizer Works

An Insiders View of How the Optimizer Works. Tang Tao Oracle University Principal Instructor .

581 views • 44 slides

PostgreSQL Query Plans

CSI 3130 - 2009 - Lab 5. PostgreSQL Query Plans. Daniel Antwi www.site.uottawa.ca/~dantw005/csi3130. Outline. Review: building PostgreSQL Query Plans. Building PostgreSQL. Download the source code postgresql-8.4.1.tar.gz http://www.postgresql.org/ftp/source/v8.4.1/ Decompress

722 views • 43 slides

Query Processing

Query Processing. General Overview. Relational model - SQL Formal & commercial query languages Functional Dependencies Normalization Physical Design Indexing Query Processing and Optimization. Review. Data Retrieval at the physical level:

510 views • 38 slides

Choosing Access Path

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Database Systems 07 Physical Design & Tuning

Database Systems 07 Physical Design & Tuning. Last update: Apr 29, 2019. Announcements/Org. #1 Video Recording Since lecture 03, video/audio recording Link in TeachCenter & TUbe ( video recorder fixed? ) #2 Statistics Exercise 1 All submissions accepted (submitted/draft)

345 views • 34 slides

Evaluation of Objectivity Databases on the Sony HSM Software and Tape Robotics

Evaluation of Objectivity Databases on the Sony HSM Software and Tape Robotics. Michael Athanas Cornell Univ. * and Nobu Katayama, Atsushi Manabe KEK. * on leave to Cereon Genomics. Motivation.

411 views • 29 slides

Understanding Graphical Execution Plans Level 200

Understanding Graphical Execution Plans Level 200. Ashwani Roy. Agenda. Query Processing lifecycle by Database Engine Elements in a Execution Plans Important Execution Plan Operators. What Happens when a Query is submitted. Query Parsing Query Optimization Query Execution. Query Plan.

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Query Optimization

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Query Execution Professor: Dr T.Y. Lin

Query Execution Professor: Dr T.Y. Lin. Prepared by, Mudra Patel Class id: 113. Topics covered . Preview of Query Compilation Introduction to Physical-Query-Plan Operators Scanning tables Sorting while scanning tables Parameters for measuring costs I/O cost for scan operators

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System R Optimizer

System R Optimizer. Read the paper (available at the course web page):

276 views • 17 slides

ICS 421 Spring 2010 Relational Query Optimization

ICS 421 Spring 2010 Relational Query Optimization. Asst. Prof. Lipyeow Lim Information & Computer Science Department University of Hawaii at Manoa. Query Optimization. Query. Parse Query. Two main issues: For a given query, what plans are considered ?

278 views • 15 slides

Access Path Selection in an RDBMS

Access Path Selection in an RDBMS. ICS 624 Spring 2011 Zachary Heilbron. Motivation. SQL: What to get, not how to get it Up to the system to figure out how Of course, speed is ideal. Query Evaluation. What are some ways to evaluate a query?

361 views • 15 slides