Definitions and Component Database

Database
A Data Base Management System (DBMS) consists of a set of inter-related data and a set of programs that make access to the data
The objectives of the DBMS is the most efficient and 'convinient'
Management of data involving both the structure and mechanism of information in their manipulation of information.


Components Database
• DATA, the data stored in integrated and used together
• hardware, hardware used in managing the database system
• SOFTWARE, software intermediary between users with physical data. software can be a data base management system and the various application programs
• USER, as a user of the system
• Property is important DBMS data independency, which can be described as a condition in which data and application programs independent in the sense that the changes do not affect each other.
• Program applications are not affected by the changes made to the data and how data is organized by the physical DBMS
• DBMS gave abstraction the management of information on the level of logic. The view logic is not dependent on the physical representation means.
• Example: accessing certain rekord appear on the logic of such access as a table, while indeed saved the file as the file hash algorithms that do the transformation to address key
• complexity-level of complexity in accessing rekord that the user does not need to know the DBMS
• Scheme relationship DBMS and FMS
• DBMS gave abstraction the management of information on the level of logic.
• Users associated with the DBMS through the logic of the concept of DBMS
• DBMS interact dngan file management system, FMS (File Management system) for the transformation of information into the logic level of physical level.
• FMS menggunakanfungsi-primitive functions pengakswsan secondary storage provided by the operating system
• The main factor that determines user satisfaction and dissatisfaction is a database system functionality and performance of the DBMS
• One of the criteria for the performance of the DBMS is the response time (response time). If the DBMS response time is too long means the value of the performance of the system worse
• Goal computing is to provide information on which decisions can be made and actions can be done
• store the data in the DBMS, in which the DBMS save the file, rekord-rekord and the relationship between files in tecord
• There are fundamental to the operating records in the file:
- Insert records
- Modify record
- Search a record
- Read the entire file
- Reorganize the file

Comments

Post a Comment

Popular posts from this blog

Apple iWork '08

Image
Apple iWork '08 by Apple ( DVD-ROM - Aug 11, 2007) ( Mac OS X ) Buy new : $74.00 $67.99 24 Used & new from $50.00 Get it by Tuesday, Dec 2 if you order in the next 19 hours and choose one-day shipping. Eligible for FREE Super Saver Shipping. ( 117 ) Electronics: See all 5,375 items amazon.com
Read more

Science, engineering and technology

The distinction between science, engineering and technology is not always clear. Science is the reasoned investigation or study of phenomena, aimed at discovering enduring principles among elements of the phenomenal world by employing formal techniques such as the scientific method. Technologies are not usually exclusively products of science, because they have to satisfy requirements such as utility, usability and safety. Engineering is the goal-oriented process of designing and making tools and systems to exploit natural phenomena for practical human means, often (but not always) using results and techniques from science. The development of technology may draw upon many fields of knowledge, including scientific, engineering, mathematical, linguistic, and historical knowledge, to achieve some practical result. Technology is often a consequence of science and engineering — although technology as a human activity precedes the two fields. For example, science might study the flow o...
Read more

20 Tricks Extend Laptop Battery Use Time (part 1)

Image
Recently, mobile technology has become increasingly sophisticated with the components of the light, the better chip, and a faster processor. But there's one part laptop, which is always the "Achilles heel" of the battery. Operating system intensive, modern graphics, and various other advanced application is very rapacious spend your laptop battery every day. With the increasing sophistication, the average laptop battery life remains in the range of 3 - 4 hours. Of course, this is still a problem for workers who often travel long distance. Most effective way at this time, no other is to bring some spare batteries in your trip, although burdensome. But, under this there are at least a few tricks that can help you save laptop batteries. 1. Laptops with the form of a system defrag Regular Defragmenrtasi can help you manage the data to be more efficient and make the hard drive (HD) a little more work to access the data. The HD works more quickly, then the less the burden will ...
Read more