'Primary index' diaporamas de présentation

CS232A: Database System Principles Indexing

CS232A: Database System Principles Indexing. Goal of Indexing. Given condition(s) on attribute(s) find qualified records Attr = value Condition may also be Attr>value Attr>=value. Qualified records. ?. value. value. value. Indexes (or Indices).

1.54k views • 138 slides

Chapter 12: Indexing and Hashing

Chapter 12: Indexing and Hashing. Basic Concepts Ordered Indices B+-Tree Index Files B-Tree Index Files Static Hashing Dynamic Hashing Comparison of Ordered Indexing and Hashing Index Definition in SQL Multiple-Key Access. Basic Concepts.

1.09k views • 91 slides

Chapter 12: Indexing and Hashing

Chapter 12: Indexing and Hashing. Chapter 12: Indexing and Hashing. Basic Concepts Ordered Indices B + -Tree Index Files B-Tree Index Files Static Hashing Dynamic Hashing Comparison of Ordered Indexing and Hashing Index Definition in SQL Multiple-Key Access. Basic Concepts.

902 views • 90 slides

Data Organization - B-trees

1.21k views • 87 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

Chap 12 Indexing and Hashing

990 views • 76 slides

Chapter 12: Indexing and Hashing

Chapter 12: Indexing and Hashing. Basic Concepts Ordered Indices B+-Tree Index Files B-Tree Index Files Static Hashing Dynamic Hashing Comparison of Ordered Indexing and Hashing Index Definition in SQL Multiple-Key Access. Basic Concepts.

886 views • 75 slides

Chapter 13

Chapter 13. CS 157 B Presentation -- Query Processing (origional from Silberschatz, Korth and Sudarshan) Presented By Laptak Lee. Introduction.

794 views • 72 slides

Chapter 12: Indexing and Hashing

Chapter 12: Indexing and Hashing. Chapter 12: Indexing and Hashing. Basic Concepts Ordered Indices B + -Tree Index Files B-Tree Index Files Static Hashing Dynamic Hashing Comparison of Ordered Indexing and Hashing Index Definition in SQL Multiple-Key Access. Basic Concepts.

720 views • 72 slides

Chapter 12: Indexing and Hashing

Chapter 12: Indexing and Hashing. Chapter 12: Indexing and Hashing. Basic Concepts Ordered Indices B + -Tree Index Files B-Tree Index Files Hashing Static Hashing Dynamic Hashing Comparison of Ordered Indexing and Hashing Multiple-Key Access and Bitmap indices

890 views • 71 slides

Indexing and Hashing

Indexing and Hashing. Basic Concepts Ordered Indices B+-Tree Index Files B-Tree Index Files Static Hashing Dynamic Hashing Comparison of Ordered Indexing and Hashing Index Definition in SQL Multiple-Key Access. Basic Concepts.

981 views • 70 slides

Basic Concepts of Relational Databases

714 views • 61 slides

Query Processing

Query Processing. Review. Support for data retrieval at the physical level: Indices : data structures to help with some query evaluation: SELECTION queries (ssn = 123) RANGE queries (100 <= ssn <=200)

761 views • 51 slides

File Structures Course: 03-60-415

File Structures Course: 03-60-415. Dr. Joan Morrissey School of Computer Science University of Windsor Windsor, Canada. What are file structures and why we need them.

653 views • 48 slides

Indexing Techniques

806 views • 45 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

Chapter 11: Indexing and Hashing

Chapter 11: Indexing and Hashing. Indexing Basic Concepts Ordered Indices B+-Tree Index Files Hashing Static Dynamic Hashing. search key pointer. Basic Concepts. Value Search Key - set of attributes used to look up records in a file. record. ?. value. Index Evaluation Metrics.

460 views • 34 slides

Chapter 8 File organization and Indices

Chapter 8 File organization and Indices. File Organization and Indexing. Assume that we have a large amount of data in our database which lives on a hard drive(s) What are some of the things we might wish to do with the data? Scan: Fetch all records from disk Equality search

510 views • 26 slides

Indexes

Indexes. An index on a file speeds up selections on the search key fields for the index. Any subset of the fields of a relation can be the search key for an index on the relation. Search key is not the same as key (minimal set of fields that uniquely identify a record in a relation).

289 views • 19 slides

index Bplus calculations

202 views • 14 slides