UNDERSTANDING THE RELATIONAL DATABASES Student’s Name Instructor’s Name Course Name 03/05/2016 RELATIONAL DATABASES Being a data administrator is to handle and organize the bulk of data masses for easy and convenient retrieval of the information at any point of time. I generally believe that compiling a bulk of data is very difficult task for anyone who has the responsibility to manage the information. Therefore, here we go through and understand the concept of relational databases and use
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that preserves the dependencies? CASE STUDY : 3 1) Anyone can read BANKACNT relation except for the ACCT NO attribute. 2) Any accountholder can read the tuple corresponding to his/her own account number from the ACNT DETAIL relation. 3) Bank employees can read tuples from ACNT DETAIL relation, but only those employees whose job is TELLER can update entries in the ACNT DETAIL relation pertaining to any ACCT NO (this field cannot be modified). 4) Bank employees can read
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It helps to minimize data redundancy i.e. there should not be any multivalued attributes. Moreover eliminating the repeating groups. 2. Helps to make database structure flexible. It means it could allow to add new data values and rows in a relation structure without reorganizing the database structure. 3. To make consistency of data throughout the database i.e. it should not suffer from anomalies as given below: a. Insert Anomaly – It occurs due to lack of data i.e. data items are scattered
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In this exercise, you will use database software to design a database for managing inventory for a small business. Sylvester’s Bike Shop, located in San Francisco, California, sells road, mountain, hybrid, leisure, and children’s bicycles. Currently, Sylvester’s purchases bikes from three suppliers, but plans to add new suppliers in the near future. This rapidly growing business needs a database system to manage this information. Initially, the database should house information about suppliers
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schema is finalized. The database tables are created. Primary, Foreign keys, database constraints and database integrity rules are specified at this stage. At this stage, the file organization is performed. File organization is the way the database relations are to be stored on the storage medium. The file organization is decided on the basis of maximum speed of access, the type of access
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Let A1,A2,...,An be attribute names with associated domains D1, D2, . . . , Dn, then R(A1: D1,A2: D2,...,An: Dn) is a relation schema. For example, Student(StudId: integer, StudName: string, Major: string) • A relation schema specifies the name and the structure of the relation. • A collection of relation schemas is called a relational database schema. * 1. List the names of all students who have borrowed a book and who are CS majors. πStName(σSTUDENTS.StId=borrows.StId (σMajor=’CS’(STUDENTS)×borrows))
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Database Design Paper Joseph Schmosef University Of Phoenix (ecampus) DBM/380 Sunday, April 01, 2012 “A database is a structured collection of records or data that is stored in a computer system. In order for a database to be truly functional, it must not only store large amounts of records well, but be accessed easily. In addition, new information and changes should also be fairly easy to input.” (tech-faq.com) To ensure usefulness over the long-term, databases should be built with high
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Database Design DBM 380 | | Databases Databases are electronic filing systems that consist of objects (Microsoft, para 2.) providing a quicker means to data retrieval than traditional paper and pen models. They have more flexibility than standard spreadsheets and offer the ability to run query searches. A properly designed database can retrieve items in complex searches; a task that might take hours or days manually, in a matter of minutes. Databases are designed to store large amounts
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Big Data and NoSQL Abstract The combination between Big Data and NoSQL is one made of inevitability. As data grows larger and larger, the weaknesses in the relational data model are exacerbated. NoSQL technologies grew out of the need for fast query speed and real-time analytics from data sources too large for traditional SQL. Introduction A web site running with a large number of users/members will experience the dreaded Big Data Performance Inconsistency. When you need the web site to respond
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STRAYER UNIVERSITY Enterprise Technology Process Models – CIS 521 Midterm Exam Quarter: May 2007 Instructor: Prof. Mort Anvari (202) 294-4230 Morteza@Anvari.net Class Web Site: http://www.anvari.net 1. How has the modern enterprise architectures changed from the early network solutions of the 1970s? The modern enterprise architectures has changed from the early network solution in that the early solution followed by vertical, hierarchial approach versus the modern
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