Question 1

With the indexed sequential access method (ISAM),records cannot be accessed randomly.

Accepted Answer

ISAM allows for both sequential access and direct (random) access of records, using an index to quickly locate records.

Question 2

Updating a flat file system is efficient and consumes less time.

Accepted Answer

Updating a flat file system can be time-consuming as every time a change is made, the entire file needs to be rewritten. This can lead to inefficiency as the file size increases, making it difficult to manage and search for information. Modern database management systems like relational databases are designed to efficiently handle data updates and retrieval.

Question 3

The integrity rules component of a data model defines the boundaries of a database,constraints,and access methods.

Accepted Answer

The integrity rules component of a data model indeed defines the boundaries of a database, constraints, and access methods.

Question 4

Although a database can consist of only a single file,it is usually a group of files.

Accepted Answer

A database usually consists of multiple files, such as data files, index files, and transaction log files.

Question 5

A database engine converts logical requests from users into their physical equivalents by interacting with other components of the database management system (DBMS).

Accepted Answer

This statement is true. The database engine is a component of the DBMS that translates logical requests from users into physical operations that can be performed on the data stored in the database. It interacts with other components, such as the query processor and storage manager, to execute these operations.

Question 6

The network data model is similar to the hierarchical data model because records are organized in the same way.

Accepted Answer

The network model allows for many-to-many relationships between records, while the hierarchical model only allows for one-to-many relationships. Therefore, they are not organized in the same way.

Question 7

An advantage that a database has over a flat file system is that more information can be generated from the same data.

Accepted Answer

A database allows for more advanced queries and analysis of the data, leading to the generation of more information than a flat file system.

Question 8

Any changes to a database's structure,such as adding a field,deleting a field,changing a field's size,or changing the data type stored in a field,are made with the data manipulation component.

Accepted Answer

Changes to a database's structure are made with the data definition component, not the data manipulation component. The data manipulation component is used to add, delete, modify, and query data.

Question 9

Redundant data is eliminated by a process called normalization.

Accepted Answer

Normalization is the process of organizing data in a database so that redundant data is eliminated, which helps to improve data consistency and reduce data anomalies.

Question 10

The sequential access file structure method is effective when a large number of records are processed less frequently,perhaps on a quarterly or yearly basis.

Accepted Answer

The sequential access file structure method is effective when a large number of records are processed less frequently, as it allows for easy retrieval of specific records in the order they appear in the file. This makes it ideal for batch processing or infrequent updates.

Question 11

The indexed sequential access method (ISAM) is slow and becomes increasingly useful as the number of records becomes larger.

Accepted Answer

The indexed sequential access method (ISAM) is a fast method of accessing records, especially when the number of records is large. It is a commonly used file organization technique for managing large volumes of data.

Question 12

The database component of an information system can generate sufficient business intelligence by accessing just the internal data of an organization.

Accepted Answer

While the internal data of an organization is an important source of business intelligence, accessing only internal data may not provide a complete picture. External data, such as market trends and industry benchmarks, may also be necessary to generate sufficient business intelligence.

Question 13

Data redundancy is eliminated or minimized in a flat file system.

Accepted Answer

In a flat file system, data redundancy is common as data is stored in a single table or file, and multiple instances of the same data may be present.

Question 14

Disks are sequential access devices,whereas tapes are random access devices.

Accepted Answer

Disks are random access devices, as data can be accessed in any order by using the disk's read/write head to move directly to the desired location on the disk. Tapes, on the other hand, are sequential access devices, as data must be read or written sequentially from the beginning of the tape to access a specific location.

Question 15

A select operation pares down a table by eliminating columns according to certain criteria.

Accepted Answer

A select operation in SQL is used to retrieve specific rows from a table, not to eliminate columns. Eliminating columns is done using a "project" operation or by specifying the columns to retrieve in the SELECT statement.

Question 16

In a relational model,the rows are called attributes and the columns are called tuples.

Accepted Answer

In a relational model, the rows are called tuples and the columns are called attributes.

Question 17

For each database,there can be more than one physical view of data.

Accepted Answer

The answer of For each database,there can be more than...

Question 18

A database is a critical component of information systems because any type of analysis that is done is based on data available in the database.

Accepted Answer

A database is where all the data is stored and therefore any analysis that is done will come from the data available in the database. Without a database, there would be no data to analyze.

Question 19

In a hierarchical data model,nodes with the same parents are called siblings.

Accepted Answer

In a hierarchical data model, nodes with the same parents are called siblings.

Question 20

Labor and population statistics are sources of internal data that are accessed by a database.

Accepted Answer

Labor and population statistics are typically considered external data sources, as they are usually collected and provided by government agencies or other organizations outside of a company.

Quiz 3: Database Systems,data Warehouses,and Data Marts