Describe the three types of anomalies associated with database tables that have not been normalized
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- Describe the three types of anomalies associated with database tables that have not been normalized.
- Using and Inventory table as an example, explain the operational implications of each anomaly.
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- A transitive dependencya. is a database condition that is resolved through special monitoring software.b. is a name given to one of the three anomalies that result from unnormalized database tables.c. can exist only in a table with a composite primary key.d. cannot exist in tables that are normalized at the 2NF level.e. is none of the above.Which of the following is NOT a data communications control objective?a. maintaining the critical application listb. correcting message loss due to equipment failurec. preventing illegal accessd. rendering useless any data that a perpetrator successfully capturesBriefly describe record counts, batch totals, and hash totals. What types of errors in input wouldeach of these controls likely identify?
- Discuss the importance of the role of the database administrator. In the flat-file environment, why is such a role not necessary? What tasks does the DBA perform?Which of the following statements is not correct? a.The database approach uses one common database to promote the concept of single user view. b.Database systems resolve task data dependency. c.The flat-file model encourages data redundancy. d.A primary goal of databasesystems is to minimize data redundancy. e.Database systems provide increased accessibility to data and data integration.Repeating group dataa. is a form of data redundancy common to replicated databases in a distributed database environment.b. is a name given to one of the three anomalies that result from unnormalized database tables.c. can exist only in a table with a composite primary key.d. cannot exist in tables that are normalized at the 2NF level.e. is none of the above.
- Which statement is NOT correct? The indexed sequential access methoda. is used for very large files that need both direct access and batch processing.b. may use an overflow area for records.c. provides an exact physical address for each record.d. is appropriate for files that require few inser- tions or deletions.Which statement is NOT true? a. Drill-down capability is an OLAP feature of data mining tools available to the user. b. The data warehouse should be separate from operational systems. c. Denormalization of data involves dividing the data into very small tables that support detailed analysis. d. Some decisions supported by a data warehouse are not fundamentally different from those that are supported by traditional databases. e. Data cleansing involves transforming data into standard business terms with standard data values.Which of the following is NOT part of the systems implementation process? a. converting databases b. documentation c. systems design d. testing and correction
- The installation of a database management system is likely to have the least impact ona. data redundancy.b. entity-wide sharing of common data.c. exclusive ownership of data.d. the logic needed to solve a problem in an application program.e. the internal controls over data access.Its specifics have been extensively implemented in third- and fourth-generation database management systems. The Three Schema Architecture does not conform to this rule. why?Discuss why control procedures over access to the data resource become more crucial under the database approach than in the flat-file environment. What role does the DBMS play in helping to control the database environment?