Relational Databases Lee Rudd Abstract Data for our programs are stored in various formats. The most commonly used format is in the form of a database since databases are not dependent on a single program or hardware platform. These databases are stored in five structures of hierarchical‚ network‚ relational‚ multidimensional‚ and object-oriented. Hierarchical structure organizes data in a one to many relationship. The network goes of the hierarchical structure by organizing data in
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ITM540 – Database and Knowledge-base Management Module 3 Case Assignment 3 Robert T. Goodwin Database Applications In his book Groupware -- Computer Support for Business Teams‚ Robert Johansen defines groupware as "specialized computer aids that are designed for the use of collaborative work groups." This definition is better than the "shared data" definition because it helps eliminate multiuser databases from the groupware category
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Part 1 Background Chapter 1 Introduction to Databases 1.1 A database management system provides a number of facilities that will vary from system to system. Describe the type of facilities you might expect‚ especially those that aid the initial implementation of a database and its subsequent administration. Initially‚ the type of facilities expected should be described. These include: data storage and retrieval‚ concurrency control mechanism‚ authorization services‚ integrity mechanisms
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Server Express. The advanced services have a database engine‚ full text search‚ reporting services‚ business intelligence development studio‚ and SQL server management studio. The tools have a database engine‚ and SQL server management studio. The SQL Server SQL Express has just a Database engine. The Limitations are there can only be 1 CPU‚ only 1GB of memory‚ only 10GB of size‚ and you can only do replication if you are a subscriber. [3] Oracle Database 11g Express has limitations of 1 CPU‚ 1GB
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1. Advantages of database over Advantages of spread sheets; One of the advantages of database is that it reduced data redundancy this is because in databases‚ there is an identifier. The identifier is the primary key‚ where when it is entered‚ all other details‚ which saved under the primary key‚ will be revealed. Therefore‚ there’ll be less repetition of data. Next‚ databases improved data integrity‚ which it will guaranteed the data proven to be correct. Linked to the primary key function‚ the
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MOBILE DATABASE CONTENTS | Page No. | i. Abstract | 3 | 1. Introduction | 3 | 2. Background | 4 | 3. Mobile Database Architecture | 5 | 4. Technique to Secure database 4.1 Data Synchronization 4.2 Mobile transaction 4.3 Embedded database 4.4 Authentication from the Web Server 4.5 Data Privacy 4.6 Adaptability to Middleware 4.7 Communication 4.8 Data Encryption at client side | 67788991010 | 5. Resisting
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of the database applications. 2. What is the role of the database in the IS generic architecture? 3. What is file-based system? Give 2 examples of FBS. 4. What are main limitations of FBS? 5. What is database? 6. What does it mean that database is self-describing collection of interrelated records? 7. What does it mean that data is integrated? 8. What does it mean that database is collection of logically related data? 9. What is DBMS? 10. What are the main categories of database languages
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NORMALIZATION OF DATABASE NORMALIZATION- is the process for evaluating and correcting table structures to minimize data redundancies‚ thereby‚ reducing the livelihood of data anomalies. The normalization process involves assigning attributes to tables based on the concept of determination. Normalization works through a series of stages called normal forms. 3 Stages of Normalization 1. 1NF or FIRST NORMALIZATION FORM 2. 2NF or SECOND NORMALIZATION FORM 3. 3NF or THIRED NORMALIZATION
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Normalization A logical design method which minimizes data redundancy and reduces design flaws. Consists of applying various “normal” forms to the database design. The normal forms break down large tables into smaller subsets. First Normal Form (1NF) Each attribute must be atomic • No repeating columns within a row. • No multi-valued columns. 1NF simplifies attributes • Queries become easier.
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DATABASE SPECIFICATIONS 1. TABLE NAME : TBLGENDER FIELD NAME DATA TYPE SIZE CONSTRAINT REFERENCES GID IntN/A PK‚ IDENTITY NONE GDESC Varchar6 NOT NULL NONE 2. TABLE NAME: TBLGRDLVL FIELD NAME DATA TYPE SIZE CONSTRAINT REFERENCES GRDID IntN/A PRIMARY KEY‚IDENTITY NONE GRDLVLDESC VarChar15 NOT NULL NONE GRDSECTION Varchar15 NOT NULL NONE 3. TABLE NAME: TBLRANK FIELD NAME DATA TYPE SIZE CONSTRAINT REFERENCES RANKID IntN/A PRIMARY KEY‚IDENTITY NONE RANKDESC Varchar20 NOT NULL NONE 4.
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