Data modeling Essays

  • Data Modeling Advantages

    1234 Words  | 5 Pages

    Data modeling is the process of analyzing the things of interest to your organization and how these things are related to each other. The data modeling process results in the discovery and documentation of the data resources of your business. Data modeling asks the question “What?” instead of the more common data processing question, “How?” Data modeling asks the question “What?” Before implementing databases of any sort, a DBA or DA needs to develop a sound model of the data to be stored. Novice

  • Relational Database Management System Advantages And Disadvantages

    1500 Words  | 6 Pages

    relational database management system is a database management system that stores the data as tables which can related to each other. The tables might be related to each other by common attributes. It consists of a set of tables or files containing data that is fitted into some particular groups. These tables have data in the forms of rows and columns. Relational databases allows the user to update delete add and access a data entry from the tables. This is done by the help of structured query language,

  • Advantages And Disadvantages Of SQL

    1795 Words  | 8 Pages

    1. SQL History: SQL A structured query language used to delete, insert, update, and retrieve data from databases. It began in 1970 when Dr. E.F Codd published a paper entitled "A Relational Model of Data for Large Shared Data Banks." This paper described a new way of organizing data into a database and led to relational database systems that we use today. While the paper of Dr. Codd defined the structure, his colleagues Donald D. Chamberlain and Raymond F Boyce in IBM were developing the query language

  • Paypal Information System: A Case Study

    1653 Words  | 7 Pages

    1. Active: The ACTIVE state of a database transaction is the initial state of a transaction. The database remains in the active state so long as the instructions are executing. That is, while read and write operations concerning the data are taking place, and therefore the transaction is neither successful or failed yet the transaction is in an active state. For example, say we have an online store where customers can buy books by paying from funds in their PayPal account. The active state

  • Hamiltonian Path Theory

    1073 Words  | 5 Pages

    Telecoms, Architectures and Business Models Graph theory Hamiltonian Path, Minimum Spanning Tree 


Serafeim (Makis) Gravanis 4413512
 1) Is finding Hamiltonian path NP-complete? Why? Also explain in your own words what NP- complete means. 
 Before we explain why the Hamiltonian path is NP-complete, it will be worth mentioning to refer on the NP-completeness. NP stands for “nondeterministic polynomial time” and its roots are coming form the complexity theory. More

  • Database Normalization Essay

    844 Words  | 4 Pages

    columns (attributes) and tables (relations) of a relational database to reduce data redundancy and improve data integrity. It involves arranging attributes in relations based on dependencies between attributes, ensuring that the dependencies are properly enforced by database integrity constraints. The steps to do the normalization: Step 1: Create first normal form (1NF): The database normalization process involves getting data to conform to progressive normal forms, and a higher level of database normalization

  • Plc Advantages And Disadvantages

    784 Words  | 4 Pages

    designed to be used for. For example, if a PLC is t used in a fast-moving large-scale process you would want a PLC with a fast CPU and a large number of inputs/outputs. Communication and compatibility If the application of the PLC requires it to share data outside of the process it needs to be able to communicate with another electronic device such as a computer. It is important to know whether your desired PLC is compatible with other electronic devices and programs used by those devices. Environment

  • Advantages And Disadvantages Of A Flat File Database

    1389 Words  | 6 Pages

    Flat File Database Definition of a Flat File database A flat file/ flat form database is a system that stores data within a single table. It is known as a flatform database due to it only containing a two dimensional structure (data fields and records). Features: - The database contains data fields which is the name of each piece of data being collected example address meaning that there will be a list of multiple addresses contained within that column. - The database also contains records which

  • Database Management And Information Retrieval System Case Study

    1137 Words  | 5 Pages

    resources to the information relevant Offer Data modelling Facility Restricted to classify of object Structured data format Unstructured data format Provide precise semantics Provide imprecise semantics Complete of query specification Incomplete of query specification Data dictionary system management Item normalization Data transformation and presentation Document database search Backup and recovery management Index database search Data store management Selective dissemination of

  • Advantages And Disadvantages Of Distributed Database Systems

    1085 Words  | 5 Pages

    systems (SBDD) are two approaches to meeting the data processing which may seem diametrically opposed: technology systems and the database of computer networks. Database systems have evolved from data processing in which each application to define and maintain their own data, to one in which the data are defined and managed centrally. This new orientation leads to independent data, such applications become immune to changes in physical or logical data organization and vice versa. A major motivation

  • SSH Proxy Tunneling Case Study

    835 Words  | 4 Pages

    round table. Everyone speaks the same language English (open connections). Simultaneous conversations are going on across the table (__data transmissions__). Anything that is said could be overheard, listened to, repeated or stolen (__vulnerable__ data) from and by anyone present or in close proximity to the round table. Your conversation is not secure! You can decide to speak in another language hoping others do not understand(__encryption__). It is somewhat secure, but definitely not guaranteed

  • Examples Of Feminist Ethnography

    1631 Words  | 7 Pages

    Thick description Observation is a systematic approach of data collection. Researchers use different methods to understand people behavior in natural way. As I complete my assignment on the observation in the library. My first goal in this assignment was to observe something where I "really expected something to happen." Linnaeus University 's library is a big library. It has three floors. There are number of staff members who always help to the students to find different books as well as to

  • Database Management And Information Retrieval System Analysis

    1371 Words  | 6 Pages

    their information / data efficiently. Question 1 Differentiate between database management system and information retrieval system by focusing on their functionalities. Database management system is a software system that enable user to define, create, maintain and control access to the database (document). It is can be found when some document need software to open it. DBMS is a database system that works with relational databases and also connected well with structured data. It allows organizations

  • Difference Between Normalization And De-Normalization

    1395 Words  | 6 Pages

    efficiency. So when performance does matter, one prefer De-normalized database. Following are the major differences between the two processes. 1. Normalization is the process of dividing the large tables into two to remove the redundancies and to achieve data integrity. While De-normalization is the reverse of normalization, in which one combines

  • Advantages And Disadvantages Of File Based System Approach

    2654 Words  | 11 Pages

    File Based System 8 c. Describe the following job roles RDBMS i. Data Administrator 10 ii. Database Administrator 11 iii. Database Designer 12 iv. Application Developer 13 v. End User

  • Essay On Memory Checker

    770 Words  | 4 Pages

    cores) in [13]. The main focus of their work is the detection of memory consistency bugs when multiple cores execute multiple threads. It works on the principle that when program execution progresses, memory accesses are tracked in the background by L1 data cache of each core. When logging resources are full, program execution

  • Essay On Digital Library

    818 Words  | 4 Pages

    Definition A digital library is the collection of services and the collection of information objects that support users in dealing with information objects and the organization and presentation of those objects available directly or indirectly via electronic/digital means. Further, there must be an appropriate multimedia repository available for the storage of digital content and metadata. Other important elements are client services for the browser, including repository querying and workflow, content

  • John Locke's Concept Of Innate Knowledge

    1226 Words  | 5 Pages

    eventually learn more things, and this is our way of letting those things from outside the jar to enter inside it. IDEAS VS SENSES According to the modern philosopher John Locke, knowledge has 2 sources: sensation and reflection. Sensation is the data perceived by our five senses. When we touch a cup of coffee, we gain

  • Algorithm Analysis Of Dynamic Table

    1280 Words  | 6 Pages

    In other words, create a new table of smaller size, and copy the data over. We need to reduce the table size when the size of our remaining data set shrinks too much. The rule for the insertion-only case was to double the table when it is full. We could simply reverse that rule, and copy our data to an array of half the current size, when it goes from just over half-full to exactly half-full. This would cost O(n)time, where n is

  • Integrity In Database Research

    1421 Words  | 6 Pages

    should depict a company’s operations if the database is required to meet the organization's data requirements. It forms the foundation for whether the included entities are correct and adequate as well as on the relationships between those entities. It is also used as a final cross check against the proposed data dictionary entries, in other words, the data dictionary contains descriptions about the data objects. When designing database tables, the difference between a good, efficient design and