🗊Презентация Introduction

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Слайды и текст этой презентации

Слайд 1


Lecture.1 Introduction National Aviation University Computer Sciences Faculty Department of software engineering
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Lecture.1 Introduction National Aviation University Computer Sciences Faculty Department of software engineering

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CONTENTS File systems and data bases Definitions of DB and DBMS Advantages of DB usage DBMS languages DBMS users Basic requirements to database systems
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CONTENTS File systems and data bases Definitions of DB and DBMS Advantages of DB usage DBMS languages DBMS users Basic requirements to database systems

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File Systems
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File Systems

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File System Drawbacks Data depends on programs Inflexibility of data structure Static data Absence of integration Data inconsistency Inefficient concurrent access Inefficient storage and processing
Описание слайда:
File System Drawbacks Data depends on programs Inflexibility of data structure Static data Absence of integration Data inconsistency Inefficient concurrent access Inefficient storage and processing

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Data Base Approach
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Data Base Approach

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Data Base Definition
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Data Base Definition

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DBMS Definition
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DBMS Definition

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DB Advantages Integrated data storage Centralized management Common usage (sharing) Data independence Data integrity Data security Effective data access management Data recovery
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DB Advantages Integrated data storage Centralized management Common usage (sharing) Data independence Data integrity Data security Effective data access management Data recovery

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Centralized DB Management DB schema design Development data storage structures DB restructuring and reorganization Supporting DB back-up and recovery mechanisms Data protection mechanisms DB Adjustments Regular observations
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Centralized DB Management DB schema design Development data storage structures DB restructuring and reorganization Supporting DB back-up and recovery mechanisms Data protection mechanisms DB Adjustments Regular observations

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Data Independence in DB Logical independence Physical independence
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Data Independence in DB Logical independence Physical independence

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Data integrity in DB The following causes integrity violation: Faults in hardware or software Incorrect data entering, modifications and deletions Concurrent data access and modifications
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Data integrity in DB The following causes integrity violation: Faults in hardware or software Incorrect data entering, modifications and deletions Concurrent data access and modifications

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Features of DB Integrity Supporting Back-up coping and restoring Checkpoints and rollbacks Integrity constraints Transactions Locking Logs activity
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Features of DB Integrity Supporting Back-up coping and restoring Checkpoints and rollbacks Integrity constraints Transactions Locking Logs activity

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Data Security User registration Control of access rights User identification Automatic logging Data encryption
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Data Security User registration Control of access rights User identification Automatic logging Data encryption

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DBMS Languages Data Definition language (DDL) Data Manipulation Language (DML) Query Language (QL)
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DBMS Languages Data Definition language (DDL) Data Manipulation Language (DML) Query Language (QL)

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Data Base Users DB administrator (group) System analytics and designers System and applied programmers End users Operators
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Data Base Users DB administrator (group) System analytics and designers System and applied programmers End users Operators

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Requirements to DB (1) Simplicity and flexibility of applications development Multiple-aspect data usage Simplicity and flexibility of data usage Simplicity and flexibility of data changes, modifications and adjustemts Efficiency, flexibility and productivity of storage and processing
Описание слайда:
Requirements to DB (1) Simplicity and flexibility of applications development Multiple-aspect data usage Simplicity and flexibility of data usage Simplicity and flexibility of data changes, modifications and adjustemts Efficiency, flexibility and productivity of storage and processing

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Requirements to DB (2) Protection against the non-authorized access, distortion and deletion Support of a required level of the data independence Support a required level of the data integrity Advanced DB administration features
Описание слайда:
Requirements to DB (2) Protection against the non-authorized access, distortion and deletion Support of a required level of the data independence Support a required level of the data integrity Advanced DB administration features

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