Review Questions 1 – - By data, we mean known facts that can be recorded and that have implicit meaning - A database is a collection of related data - A database management system (DBMS) is a collection of programs that enables users to create and maintain a database. The DBMS is a general-purpose software sys- tem that facilitates the processes of defining, constructing, manipulating, and sharing databases among various users and applications. - A fundamental characteristic of the database
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21. _____ is an example of a personal DBMS. access 22. _____ is the process of converting a data model into tables, relationships, and data constraints. database design 23. The _____ problem is unique to a multiuser database environment. lost-update _____ show data in a structured context. reports A ______ is a collection of forms, reports, queries, and programs that process a database. database application ______ is a popular enterprise DBMS. DB2 ______ is the most popular diagramming
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Define the following terms: data, database, DBMS, database system, database Catalog, program-data independence, user view, DBA, end user, canned transaction, deductive database system, persistent object, meta-data, and transaction-processing application. Data: Known facts that can be recorded and that have implicit meaning. Database: A collection of related data with an implicit meaning. DBMS: A collection of programs that enables users to create and maintain a database. Database System:
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Review of Major DB Concepts • Data and Information – Data: raw facts – Information: processed data • • • • Database Metadata DBMS: Database management system Database system 1 An Example of Data • Sales per employee for each of Xcompany’s two divisions 2 Data and Its Structure • Data is actually stored as bits, but it is difficult to work with data at this level. • It is convenient to view data at different levels of abstraction. • Schema: Description of data at some level.
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300 MHz–3 GHz: UHF, 3–30 GHz: SHF 7. A microwave transmitter typically requires a +8-dBm audio level to drive the input fully. If a +10-dBm level is measured, what is the actual voltage level measured? Assume a 600- sys- tem. (2.45 V) 9. Convert the following powers to their dBm equivalents: (a) p = (b) p = (c) p = (d) p = 1 W (30 dBm) 0.001 W (0 dBm) 0.0001 W (-10 dBm) 25mW (-16 dBm) 15. Define information theory. 16. What is Hartley’s law? Explain its significance. 23. A triangle
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| |the System | | | | |Fleet Truck Maintenance |Relational database and |Fleet Maintenance |The DBMS will house |Drivers, Fleet |Ease of use – This DBMS has a | |Database Management |an information | |all the maintenance |Maintenance, and the|familiar Windows ‘look and | |System |management tool that |
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Review Questions 1. What are the problems of managing data resources in a traditional file environment and how are they solved by a database management system? List and describe each of the components in the data hierarchy. Figure 6–1 shows the data hierarchy. The data hierarchy includes bits, bytes, fields, records, files, and databases. Data are organized in a hierarchy that starts with the bit, which is represented by either a 0 (off) or a 1 (on). Bits can be grouped to form a byte to
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accessing databases on network servers – enterprise-wide distributed applications. Course Description • Introduces the basic and fundamental concepts on databases and the management of databases in terms of the different applications. • Exposes the use of DBMS to create and maintain applications. – – – – table construction Forms queries and report generations Course Objectives • Trace the growth and importance of database application; • Identify the advantages and disadvantages of database systems; • Apply
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Chapter 10 Transaction Management and Concurrency Control Discussion Focus Why does a multi-user database environment give us a special interest in transaction management and concurrency control? Begin by exploring what a transaction is, what its components are, and why it must be managed carefully even in a single-user database environment. Then explain why a multi-user database environment makes transaction management even more critical. Emphasize the following points: • A
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will be able to reach more customers. The Bead Bar should use an Enterprise DBMS to The Bead Bar. The enterprise DBMS will allow The Bead Bar is a large enough company that an enterprise DBMS will be what they need. Enterprise DBMS's are perfect for organizations, and companies that have multiple locations. The enterprise DBMS can give prices, changes, and inventory information to the different locations. Enterprise DBMS runs from one central location, then branches out to the other locations. They
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