'Secondary index' presentation slideshows

Data Organization - B-trees

1.21k views • 87 slides

Chapter 14 Query Optimization

Chapter 14 Query Optimization. Chapter 14: Query Optimization. Introduction Statistical (Catalog) Information for Cost Estimation Estimation of Statistics Cost-based optimization Revisiting Selection Algorithms Transformation of Relational Expressions and Equivalence rules

1.04k views • 82 slides

Single level index

Single level index. Single-level index: file of entries Will point to : The record in the data file <field value, pointer to record> or The block which contains the record <field value, pointer to block> field value ordered by indexing field Single-level index:

1.37k views • 80 slides

CSCE 310 / 603 Database Systems

CSCE 310 / 603 Database Systems. Chapter 14: Index Structures. Indexes on Sequential Files. Effects of Actions on Index. Explanations for Actions. create/destroy empty overflow block has no effect on dense index since it refers to records sparse index since it refers to main records

842 views • 69 slides

Alan Fekete ( University of Sydney) Electrical Engineering and Computer Sciences

599 views • 48 slides

519 views • 48 slides

Indexing Techniques

807 views • 45 slides

More on Indexes

More on Indexes. Secondary Indexes B-Trees. Source: our textbook, slides by Hector Garcia-Molina. Secondary Indexes. Sometimes we want multiple indexes on a relation. Ex: search Candies(name,manf) both by name and by manufacturer

575 views • 40 slides

577 views • 39 slides

Physical Design

Physical Design. 3. Introduction. Database Design Methodology requirements specification ER/EER modelling validation of ER/EER models; aggregation of different views transformation of ER/EER model into relational model normalisation physical design monitor and tune operational system.

646 views • 34 slides

Lecture 9

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Chapter 16

647 views • 33 slides

DB2 Version 8 Partitioning Changes

DB2 Version 8 Partitioning Changes. Phil Grainger, Computer Associates. Disclaimer. This presentation has been written from documentation from IBM that existed in May 2003 and also takes some examples from early experiences with Version 8 itself

464 views • 33 slides

Index Structures

Index Structures. Chapter : Objectives. Types of Single-level Ordered Indexes Primary Indexes Clustering Indexes Secondary Indexes Multilevel Indexes Dynamic Multilevel Indexes Using B-Trees and B+-Trees Indexes on Multiple Keys. Indexes as Access Paths.

620 views • 33 slides

Indexes as Access Paths

Indexes as Access Paths. A single-level index is an auxiliary file that makes it more efficient to search for a record in the data file. The index is usually specified on one field of the file (although it could be specified on several fields)

424 views • 28 slides

Chapter 18 - basic definitions - binary trees - tree traversals

Chapter 18 - basic definitions - binary trees - tree traversals. Intro. to Trees. Trees. A recursively defined data structure Each node has links to two or more subtrees/children-nodes. Each node itself can be the beginning of a new tree.

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270 views • 17 slides

Tutorial 19

Tutorial 19. Dina Said. Indexing Data. 1. A data entry k* is an actual data record (with search key value k 2. A data entry is a (k, rid) pair, where rid is the record id of a data record with search key value k .

252 views • 13 slides

K-tree/forest: Efficient Indexes for Boolean Queries

K-tree/forest: Efficient Indexes for Boolean Queries. Rakesh M. Verma and Sanjiv Behl University of Houston www.cs.uh.edu/~rmverma. Boolean queries. Alice and Bob -- Retrieve documents containing Bob and Alice Alice or Bob -- Retrieve documents containing either Bob or Alice or both

254 views • 11 slides

14.14

14.14. Consider a disk with B= 512 bytes. P=6 bytes r=30,000 R=114 bytes bfr =4 b=7500 Suppose the file is ordered by the key field EmployeeID and we want to construct an index on EmpID. Calculate the following: What type of index would we create. Index blocking factor (bfri)

149 views • 2 slides