Learning Objectives Sisber
-Able to understand the file organization and manipulation.
-Can explain file organization and management.
-Can be explained in the file storage.
-Can explain the various devices
-Manipulation of files: sorting and merging.
-Able to work with various types of file organization.
-Able to understand the file organization and manipulation.
-Can explain file organization and management.
-Can be explained in the file storage.
-Can explain the various devices
-Manipulation of files: sorting and merging.
-Able to work with various types of file organization.
Preliminary
-File System Concepts
-Data Representation
-Data Classification
-General Definitions
-Various File Types
File-Access Model
-Accessing Files & Engineering Organization
-Model usage
File-Model Operation
File System Concepts (1)
* The purpose of the computing process: generate the information required (sesuaidenganrequirement user) within which is still acceptable to the user.
* When computing the volume of data that is processed / processed.
* Data Management in the amount of besarmembutuh kaneffort more, both in terms of storage devices and management (storage and accessing it means). Such data should:
Multi-user accessible
-Is always available at any time needed for processing
Relatively fast-access time
-Stored in secondary storage media
File System Concepts (2)
In General:
File System: storage systems, organization, management of data on external storage devices, using a specific data organization technique
More spesisfik:
System Access File and related to how to insert data, update and reorganization of data
Data Representation
There are two types:
By logical
Dilevel data depiction conceptual depiction of the data by methods such as ER, model object, model semantics, and others.
Physical representations of physical dilevel data, how data is represented in storage media
Data Classification
* Fixed data-group data that does not change, at least within the lama.-Example: Personal data of students.
* Data Not Fixed-group data that are routinely experienced perubahan.-Example: The data plan for student studies.
* Data this time usually increases according to-group data is data accumulation of fixed data and data groups do not tetap.-Example: The data transcripts.
General Definitions (1)
* Database (Database)
A collection of interrelated data. Data stored in the data base is a collection of several files. The data base can be defined in a number of perspectives such as:
The set of group-related data are organized in such a way so that later can be recovered quickly and easily;
-A collection of interrelated data stored together in such a manner and without repetition (redundancy) is not necessary, to meet various needs;
-Set of interrelated files stored on electronic storage
General Definitions (2nd)
* File
A collection of records which states that entities terogranisir collection and stored on electronic storage media
KarakteristikFile
Persistance (BertahanLama)
An ability to be accessible in the future;
-Sharability (Multi User)
Can be used simultaneously by multiple users and computer programs;
-Size (size)
Having a relatively large size compared to main memory
DefinisiUmum (3)
* Record
A set of fields that are interconnected and well organized within the file.
KlasifikasiRecord
-Fixed Length
All fields in the record which remain mempunyaipanjangyang
-Variable Length
Fields contained in the record has a different length
General Definitions (4)
* Field
-Contains basic values (basic values) that form a record
-Attributes that contain a particular data item
It consists of component-data type and value (value).
Classification Field
-Fixed Length Field
Field with fixed size;
Field-Variable Length
Field sizes vary.
Various Kinds Files (1)
There are several kinds of files, including:
-Master File (Master File)
Master File (Master File), File parent who became the main reference of a process; Example Master File in the organization of a factory: * Payroll Master File * Customer Master File * Personnel Master File * Inventory Master File
there 2 types of Master File:
1. Reference Master File; berisirecord-Files which takberubah / jarangberubah.
-Example: Customer file contains the account number field, the name and address.
2. Dynamic Master File;-File that contains a record of continuous change within
Specific time or based on an event transaction.
-Example: * *File File stock goods seating reservations
File-Transaction (Transaction File)
* Files thatcontains information used for updating the file parent.
* In a certain period of reorganization that involved the file master file transaction and Produce a new master file.
-Report File (File report)
That is a file containing the data for the purposes of making reports
This file can be printed on paper or just displayed on the screen
-Work File (File Work)
Is a temporary file in sistem.A work files is a tool to pass the data created by a program to another program. Usually this file is created at the time of the process of sorting.
-File Program (Program Files)
That is a file contains instructions for processing data to be stored in other files / on the main.Instruksi memory may be written in high level languages (COBOL, FORTRAN, BASIC, etc.), assembler language and machine language.
-Text File (Text File)
Is a file that contains alpha numeric input data and graphs that are used by a text editor programs. Text files can only be processed with a text editor
-Dump-File (File Capacity)
Is a file that is used for security purposes (security), notes about the activities of the update, a set of transactions that have been processed or a program that has errors ..
-Library file (File Library)
Is a file that is used for storage of application programs, utility programs or other programs
-File History
WHO is a file storing data within a specified period of time that has past, usually used to compile statistical reports or summary
