Tugas – True Or False : Database Design
1. A database is a collection of files.
A. True
B. False
2. Duplication of data items in multiple files is normally cited as the principal advantage of
file-based systems.
A. True
B. False
3. Conventional files are relatively easy to design and implement because they are normally
designed for use with a single application or information system.
A. True
B. False
4. The principal disadvantage of database systems is the inability to share the same data
across multiple applications and systems.
A. True
B. False
5. A common misconception about the database approach is that you can build a single superdatabase that contains all data items of interest to an organization.
A. True
B. False
6. Unfortunately, database technology cannot yet offer the advantage of storing data in
flexible formats. This is because databases are intricately tied to the information systems
and application programs that will use them. Users cannot use the data in ways not
originally specified by the database designers. This is known as data dependence.
A. True
B. False
7. Database technology is more complex than file technology.
A. True
B. False
8. A record is the physical implementation of a data attribute. Records are the smallest unit
of meaningful data to be stored in a file or database.
A. True
B. False
9. A secondary key is a field whose values identify the second record in a file.
A. True
B. False
10. A foreign key is an alternate identifier for a file. Its value may identify either a single file
or a subset of all files.
A. True
B. False
11. A secondary key might be created by combining the first and second fields. In this
situation, it is called a combination key.
A. True
B. False
12. A single file in a database may only have one foreign key, but it may have several primary
keys. To facilitate searching and sorting, a key sequence field is frequently created for
keys.
A. True
B. False
13. Concatenated keys are pointers to the records of a different file in a database and how
the database links the records of one type to those of another type.
A. True
B. False
14. A blocking factor is the number of logical records included in a single read or write
operation (from the computer's perspective). A block is sometimes called a physical
record.
A. True
B. False
15. A table is the relational database equivalent of a file.
A. True
B. False
16. Archival files or tables contain records that describe business events. The data describing
these events have an unlimited useful lifetime, and can be archived off-line.
A. True
B. False
17. Table look-up files are special records of updates to other files, especially master and
transaction files. They are used in conjunction with archival files to sort data. Archival
dictionaries are typically built into better database technologies.
A. True
B. False
18. To determine database requirements, a database administrator (DBA) models the system's
data requirements as entities and relationships. The entities and relationships provide for
the technical implementation of the database.
A. True
B. False
19. The database is built around the information systems to give both executives and data
administrators flexible access to data.
A. True
B. False
20. Operational databases and transactional databases are synonyms that refer to databases
that are developed to support day-to-day operations and business transaction processing
for major information systems.
A. True
B. False
21. Fourth-generation programming languages, query tools, and decision support tools are
used to generate reports and analyses off of data warehouses. This is also called data
mining.
A. True
B. False
22. Programmers and database designers purposely create personal and work group databases
to be extremely limited. These types of databases cannot contain unique data, or import
data from conventional files, operational databases, and/or data warehouses. This saves
on user training and maintenance costs.
A. True
B. False
23. Database administrators (DBAs) are responsible for the data planning, definition,
architecture, and management of databases.
A. True
B. False
24. One or more data administrators are responsible for the database technology, database
design and construction consultation, security, backup and recovery, and performance
tuning.
A. True
B. False
25. Database management system (DBMS) refers to the database technology including the
database engine, database utilities, database CASE tools for analysis and design, and
database application development tools.
A. True
B. False
26. Database architecture refers to the specialized computer software available from
computer vendors that is used to create, access, control, and manage the database.
A. True
B. False
27. The DDL and database engine hide details concerning how records are organized and
allocated to the disk.
A. True
B. False
28. Multidimensional databases implement data in a series of three-dimensional tables that
are linked to one another via primary keys. Each row (sometimes called a relation)
consists of named tables (which are fields or attributes) and any number of unnamed
columns (which correspond to records).
A. True
B. False
29. SQL is a DBMS that supports complete database creation, maintenance and usage, and can
hide details concerning how records are organized and allocated to the disk.
A. True
B. False
30. Triggering is a three-step technique that places the data model into first, second and
third normal forms.
A. True
B. False
31. Database design can proceed even if the underlying physical data model is only in second
normal form (2NF).
A. True
B. False
32. In a database, key integrity means that tables can have the same primary key values
across records.
A. True
B. False
33. The foreign key for a record must be allowed to have a NULL value.
A. True
B. False
34. Key integrity means that appropriate controls must be designed to ensure that no field
takes on a value that is outside the range of legal values.
A. True
B. False
35. Referential integrity means that a primary key cannot take on the NULL value.
A. True
B. False
36. Domain integrity means that the architecture of relational databases implements the
relationships between the records in tables via foreign keys.
A. True
B. False
37. Centralization analysis of a database establishes which business locations need access to
which logical data entities and attributes.
A. True
B. False
38. Distributed data analysis establishes that a database would be implemented on a single
server regardless of the number of physical locations that may require access to it.
A. True
B. False
39. Horizontal distribution of the data means that each table or entire rows in a table would
be assigned to different database servers and locations.
A. True
B. False
40. Horizontal distribution of the data results in efficient access and security of data because
each location has only those tables and rows required for that location.
A. True
B. False
41. Vertical distribution of the data means that each table or entire rows in a table would be
assigned to different database servers and locations.
A. True
B. False
42. Most modern data definition languages (DDL) include powerful, menu-driven database
generators that automatically create a DBMS and generate a prototype database from
that DBMS.
A. True
B. False
43. It is important for the data definition language (DDL) to estimate how much disk capacity
is required for a new database to ensure that sufficient disk space is available.
A. True
B. False