'Fixed length records' diaporamas de présentation

Computer Science I

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Fundamental File Structure Concepts

Fundamental File Structure Concepts. Reference: Folk, Zoellick and Riccardi. Sections 4.1, 5.1. Outline. Field and record organization (Section 4.1) Sequential search and direct access (Section 5.1) Sequential Files Sorted Sequential Files Co-sequential processing. Files.

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FILES (AND DISKS)

FILES (AND DISKS). Query Optimization and Execution. Relational Operators. Files and Access Methods. Buffer Management. Disk Space Management. DB. Block diagram of a DBMS. Query Optimization and Execution. Relational Operators. Files and Access Methods. Buffer Management.

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Storing Data: Disks and Files

Storing Data: Disks and Files. 11.1 Memory Hierarchy. Primary Storage : main memory. fast access, expensive. Secondary storage: hard disk. slower access, less expensive. Tertiary storage : tapes. slowest access, cheapest. 11.2 Disks. Characteristics of disks:

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Representing Data Elements

Representing Data Elements. Fields, Records, Blocks Variable-length Data Modifying Records. Source: our textbook. Overview. Attributes are represented by sequences of bytes, called fields Tuples are represented by collections of fields, called records

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Verification

Verification process of comparing the actual content of records to those portions of the supporting documentation that provide the file structure and coded values of relevant portions of the record. Importance

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Haiku Error Messages:

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RECORD MODIFICATION

AKSHAY SHENOY CLASS ID :108 Topic 13.8 Proffesor : T.Y Lin. RECORD MODIFICATION. INTRODUCTION. What is Record ? Record is a single, implicitly structured data item in the database table. Record is also called as Tuple. What is definition of Record Modification ?

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Records and Files

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Overview

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