'Retrieving matching reserves tuples' diaporamas de présentation

CAS CS 460/660 Introduction to Database Systems Query Evaluation II

CAS CS 460/660 Introduction to Database Systems Query Evaluation II. Query Parser. Catalog Manager. Query Optimizer. Plan Generator. Plan Cost Estimator. Schema. Statistics. Query Plan Evaluator. Cost-based Query Sub-System. Select * From Blah B Where B.blah = blah. Queries.

446 views • 44 slides

Evaluation of Relational Operations

Evaluation of Relational Operations. Relational Operations. We will consider how to implement: Selection ( ) Selects a subset of rows from relation. Projection ( ) Deletes unwanted columns from relation. Join ( ) Allows us to combine two relations.

369 views • 28 slides

Query Optimization II

273 views • 27 slides

Overview of Query Evaluation

Overview of Query Evaluation. Chapter 12. Objectives. Preliminaries: Core query processing techniques Catalog Access paths to data Index matching Summary of query processing algorithms Selection Projection Join Introduction to query optimization Query plans

378 views • 22 slides

Overview of Query Evaluation

Overview of Query Evaluation. Chapter 12. Overview of Query Evaluation. Plan : Tree of R.A. ops, with choice of alg for each op. Two main issues in query optimization: For a given query, what plans are considered ?

315 views • 22 slides

Overview of Query Evaluation

Overview of Query Evaluation. Chapter 12. Objectives. Preliminaries: Core query processing techniques Catalog Access paths to data Index matching Summary of query processing algorithms Selection Projection Join Introduction to query optimization Query plans

227 views • 22 slides

Overview of Query Evaluation

213 views • 21 slides