In web-to-database middleware, ____ reads, validates, and executes the script.
Select one:
a.
Web server
b.
Web-to-database middleware
c.
TCP/IP Network
d.
Database server
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_____ is responsible for the definition, documentation, and communication of policies, standard
and procedures before enforcement.
Select one:
a.
Database Administrator
b.
System administrators
c.
Security Administrators
d.
Top management Stakeholders
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The DBMS _____ the SQL query and chooses the most efficient access/execution plan.
Select one:
a.
processes
b.
fetches
c.
parses
d.
executes
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Logical design is the second stage in the database design process. Which of the following would you
consider the correct steps in performing logical design?
1. Map the conceptual model to logical model components
2.Validate the logical model integrity constraints
3. Validate the logical data model using normalization
4. Validate the logical model against user requirement
Select one:
a.
1, 3, 4, and 2
b.
1, 4, 2, and 3
c.
1, 3, 2 and 4
d.
1, 2, 3, and 4
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____ are places on unique fields and they are used to locate a specific record pointed to by the
index.
Select one:
a.
Primary indexes
b.
Single-level indexes
c.
Secondary indexes
d.
Multi-Level indexes
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_____ distributed database management systems (DDBMS) integrate multiple instances of the
same DBMS over a network.
Select one:
a.
Fully heterogeneous
b.
Combination
c.
Heterogeneous
d.
Homogeneous
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In web-to-database middleware, ____ is responsible to receive, validate, and returns requests to
the client browser.
Select one:
a.
Web-to-database middleware
b.
Web server
c.
Client computer
d.
TCP/IP Network
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"A password must have a minimum of five characters" is an example of a _____.
Select one:
a.
procedure
b.
standard
c.
rule
d.
policy
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Use the scenario depicted in the figure and the SQL query that follows it to answer this question.
At Location C:
BEGIN WORK;
UPDATE CUSTOMER
SET CUS_BALANCE = CUS_BALANCE + 100
WHERE CUS_NUM='10936';
INSERT INTO INVOICE(INV_NUM, CUS_NUM, INV_DATE, INV_TOTAL)
VALUES ('986391', '10936', ‘15-FEB-2018’, 100);
INSERT INTO INV_LINE(INV_NUM, PROD_CODE, LINE_PRICE)
VALUES ('986391', '1023', 100);
UPDATE PRODUCT
SET PROD_QOH = PROD_QOH - 1
WHERE PROD_CODE = '1023';
COMMIT WORK;
What does this SQL sequence represents?
Select one:
a.
Remote transaction
b.
Remote request
c.
Distributed transaction
d.
Distributed request
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A[n] _____ data dictionary is not updated automatically and usually requires a batch process to
be run.
Select one:
a.
dynamic
b.
static
c.
active
d.
passive
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A distributed _____ contains the description of the entire database as seen by the database
administrator.
Select one:
a.
global catalog
b.
global index
c.
data thesaurus
d.
data dictionary
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Which of the following is a client-side extension?
Select one:
a.
TCP/IP
b.
ODBC
c.
ActiveX
d.
SQL*Net
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One of the important functions provided by the database _____ is to reserve the resources that
must be used by the database at run time.
Select one:
a.
initialization parameters
b.
security component
c.
administrator
d.
authorization manager
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_____ is the delay imposed by the amount of time required for a data packet to make a round trip
from point A to point B.
Select one or more:
a.
Network latency
b.
Replica transparency
c.
Network partitioning
d.
Data distribution
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On the client side, the objective is to generate an SQL query that returns a correct answer in the
least amount of time, using a minimum amount of resources at the server end. The activities
required to achieve this goal are commonly referred to as _____ tuning.
Select one:
a.
DBMS performance
b.
database SQL
c.
client SQL
d.
SQL performance
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A[n] _____ can use a shared connection to the database instead of creating a new one every time.
Select one:
a.
HTTP GET request
b.
web browser
c.
API
d.
DLL
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At the operational management level, the database must be able to ______.
Select one:
a.
Ensure the security evaluation
b.
Monitor and control the allocation and use of company resource
c.
Produce query results within specific performance levels
d.
Improve the likelihood of a positive return on investment
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The objective of concurrency control is to ensure the ____ of transactions in a multi-user
database management system.
Select one:
a.
Isolation
b.
Consistency
c.
Atomicity
d.
serializability
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Shoprite is a South Africa (SA) based company. The company also has other branches in different
African countries like Nigeria and Angola. Shoprite has an EMPLOYEE table containing the
following attributes EM_NAME, EMP_SALARY, EMP_ADDRESS, EMP_BRANCH,
EMP_DEPARTMENT, EMP_DOB. Shoprite EMPLOYEE data are distributed over three
locations: South Africa, Nigeria, and Angola. The table is divided by location; that is, the South
African employee data are stored in fragment A, Nigeria employee data are stored in fragment B
and Angola employee data are stored in fragment C. See Figure 1 below.
Angola employee data are stored in fragment C. See Figure1 attached below
Having gone through the scenario which type of transparency feature does it represents?
Select one:
a.
Performance transparency
b.
Heterogeneity transparency
c.
Distribution transparency
d.
Transaction transparency
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A database management system needs _____ to prepare the data for presentation to the end user
or to an application program.
Select one:
a.
security
b.
formatting
c.
concurrency control
d.
I/O interface
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Query optimization routines are more complicated in DDBMS because DDBMS must
decide______.
Select one:
a.
Whose and what fragment of the database to access
b.
What and which fragment of the database to access
c.
Where and which fragment of the database to access
d.
Where and what fragment of the database to access
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Data definition is an essential part of ______ database life circle’s phase.
Select one:
a.
Four
b.
Three
c.
One
d.
Two
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One disadvantage of a distributed database management system (DDBMS) is:
Select one:
a.
slower data access.
b.
processor dependence.
c.
site additions affects other operations.
d.
absence of standard.
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_____ activities cover all tasks directly related to the day-to-day operations of the DBMS and its
applications.
Select one:
a.
Security auditing and monitoring
b.
System support
c.
Backup and recovery
d.
Performance monitoring and tuning
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Shoprite is a South Africa (SA) based company. The company also has other branches in different
African countries like Nigeria and Angola. Shoprite has an EMPLOYEE table containing the
following attributes EM_NAME, EMP_SALARY, EMP_ADDRESS, EMP_BRANCH,
EMP_DEPARTMENT, EMP_DOB. Shoprite EMPLOYEE data are distributed over three
locations: South Africa, Nigeria, and Angola. The table is divided by location; that is, the South
African employee data are stored in Fragment A, Nigeria employee data are stored in Fragment B
and Angola employee data are stored in Fragment C. See Figure 1 below.
Angola employee data are stored in fragment C. See Figure attached.
Based on the above scenario, the following query is written.
SELECT *
FROM EMPLOYEE
WHERE EMP_DOB = ’10-DEC-1988’
What transparency feature does the query represent and why?
Select one:
a.
Fragmentation transparency because the query does not indicate the fragment names or location.
b.
Local mapping transparency because the query does not specify the fragment names and their
locations.
c.
Location transparency because the query does not specify the location of the fragments
d.
Transaction transparency because the query does not indicate the fragment, location and the
mapping of the query.
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In most highly distributed database systems, designers tend to emphasize ______ over data_____
and _____?
Select one:
a.
Confidentiality, partition, and consistency
b.
Consistency, availability, and confidentiality
c.
Availability, consistency, and partition
d.
Partition, confidentiality, and availability
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Peter Kruger is a manager of a small product distribution company in Port Elizabeth. As the
business is fast growing, Peter sees the need to manage the massive information pool to help guide
the fast growth. Peter is familiar with spreadsheet software and he currently employs a sales force
of four people. Because of your knowledge and small experience in database, Peter approached you
to develop a data warehouse application prototype. This prototype will enable him to study sales
figures by year, region, salesperson, and product.
Based on this scenario, which data warehouse subset would you create to assist Peter?
Select one:
a.
relational mart
b.
data mart
c.
data mining
d.
star schema
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At the middle management level, the database must be able to______.
Select one:
a.
Improve the likelihood of a positive return on investment
b.
Provide access to external and internal data
c.
Monitor and control the allocation and use of company resource
d.
Provide feedback to monitor whether the company is achieving its goals
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Which of the processing is used to represent the process of storing separate copies of the database
at multiple locations?
Select one:
a.
Data Replication
b.
Data Redundancy
c.
Mixed Replication
d.
Cloud Computing
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Which of the following would Not be considered an advantage of SQL data services in
comparison with in-house database systems.
Select one:
a.
Dynamic and automatic load balancing
b.
High level of failure tolerance
c.
High reliability and scalability of relational database capabilities at a low cost
d.
Central creation and allocation of database processes with the server
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Peter Kruger is a manager of a small product distribution company in Port Elizabeth. As the
business is fast growing, Peter sees the need to manage the massive information pool to help guide
the fast growth. Peter is familiar with spreadsheet software and he currently employs a sales force
of four people. Because of your knowledge and small experience in database, Peter approached you
to develop a data warehouse application prototype. This prototype will enable him to study sales
figures by year, region, salesperson, and product.
The above scenario would allow you to create fact and dimension tables. Which attribute would
the fact table use to connect to the dimension tables?
Select one:
a.
Primary keys
b.
Composite keys
c.
Candidate keys
d.
Superkeys
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______ fragmentation allows you to break a single object into two or more segments or
fragments.
Select one:
a.
Data
b.
Vertical
c.
Horizontal
d.
Mixed
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Assuming DBMS has three transactions (T1, T2 and T3) to execute at the same time. To properly
execute these transactions, the DBMS schedules the concurrent execution of the transaction
operations.
In the above case, which transaction properties should individual transactions comply with to
enable the execution of these transactions?
Select one:
a.
Atomicty, Consistency, Isolation, and Durability
b.
Serializability
c.
All transaction properties including serializability
d.
Isolation and serializability
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A[n] _____ phase in a two phase lock is when a transaction releases all locks and cannot obtain a
new lock.
Select one:
a.
locking
b.
shrinking
c.
unlocking
d.
growing
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What is the responsibility of Data replication and partitioning as a star schema performance
improvement technique?
Select one:
a.
Splits and makes a copy of a database table
b.
Fragments the database table
c.
Horizontally and vertically divide the database
d.
Develop multiple facts of the database tables
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Query optimization must provide ______ transparency in distributed database systems.
Select one:
a.
Transaction transparency
b.
Distribution transparency
c.
Performance transparency
d.
Heterogeneity transparency
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The main requirements for a decision support database are______.
a. Data extraction and loading
b. Database schema
c. Data manipulation and processing
d. Data storage improvement
Select one:
a.
a, b
b.
a, c
c.
b, c
d.
b, d
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Which of the following database middleware provides end users support to access both relational
and non-relational data?
Select one:
a.
Remote Data Objects (RDO)
b.
Object Linking and Embedding for Database (OLE-DB)
c.
Atomicity Open Database Connectivity (ODBC)
d.
Data Access Objects (DAO)
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The attribute hierarchy provides a top-down data organization that is used for two main
purposes: _____ and drill-down/roll-up data analysis.
Select one:
a.
decomposition
b.
de-normalization
c.
aggregation
d.
normalization
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Read the following query and answer the question
SELECT P_CODE, P_PRICE
FROM PRODUCT
WHERE P_PRICE >= (SELECT AVG(P_PRICE) FROM PRODUCT);
Assuming the table used in the above query do not have table statistics, which type of optimization will
the DBMS use?
Select one:
a.
DBMS will use cost-based optimization
b.
DBMS will use SQL performance tuning
c.
DBMS will use rule-based optimization
d.
DBMS will use database performance tuning
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A distributed request allows us reference data from several different data processor (DP) sites.
Since each request can access data from more than one DP site, a transaction can access several DP
sites. Which type of distributed processing is required to execute a distributed request?
Select one:
a.
Fragmented distributed database processing
b.
Replicated distributed database processing
c.
Partial distributed database processing
d.
Fully distributed database processing
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You work with a group on a database project. The project group is ready to make a final decision
between relational online transaction processing (ROLAP) and multidimensional online
transaction processing (MOLAP). What should be the basis for this decision?
Select one:
a.
The systems requirements
b.
The system and end users requirements
c.
The end users requirements
d.
The requirements of all the stakeholders
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Which of the following is a rule that applies to the two-phase locking protocol?
Select one:
a.
No data is affected until the transaction is released
b.
No data is affected until locks are released
c.
No unlock operation can precede a lock operation in a different transaction
d.
Two transactions cannot have conflicting locks
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Lock _____ indicates the level of lock use.
Select one:
a.
shrinking
b.
growing
c.
serializability
d.
granularity
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From the data analyst’s point of view, decision support system (DSS) data differ from operational
data in the following ways except for_____.
Select one:
a.
dimensionality
b.
query activity (frequency and complexity)
c.
timespan
d.
granularity (level of organisation)
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Dirty data means data that is NOT ____?
Select one:
a.
Available
b.
Partitioned
c.
Consistent
d.
Confidential
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Every XML document has a _____.
Select one:
a.
root element
b.
DTD
c.
schema
d.
base tag
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Which of the following is a characteristic of the XML metalanguage?
Select one:
a.
You can use the // symbol for entering a comment in the XML document
b.
It allows the definition of new tags.
c.
It can be used as a replacement for HTML.
d.
It is concerned with the way data are displayed.
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______ is the OLE-DB object that manages connection with data source and provide data to the
consumers.
Select one:
a.
Providers
b.
Consumers
c.
Drivers
d.
Suppliers
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If a company has 300,000 product sales records, they wind up summarizing at least 300,000 rows.
Although such summaries may not be a very taxing operation for a DBMS initially, a comparison
of ten or twenty years' worth of sales is likely to start bogging the system down. In such cases, it
will be useful to have special aggregate tables, which are _______.
For example a YEAR_TOTAL table may contain the following fields:
YEAR_ID, MONTH_1, MONTH_2,....MONTH12, YEAR_TOTAL
Select one:
a.
Denormalized
b.
Partitioned and replication
c.
Normalized
d.
Create and can maintain multiple fact table
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Three transactions T1, T2 and T3 are being executed simultaneously. T1 updates the university
database with students that registered for INF3703, T2 updates INF3708 registered students and
T3 draws reports on the lists of students that have registered for both module. T2 is however roll
back after the T3 have already drawn report from T2 that have not been finalised.
Which transaction property does this scenario violate?
Select one:
a.
Consistency
b.
Isolation
c.
Atomicity
d.
Durability
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The implicit beginning of a transaction is when _____.
Select one:
a.
the first SQL statement is encountered
b.
a table is accessed for the first time
c.
the COMMIT command is issued
d.
a database is started
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Coordinating, monitoring, and allocating database administration resources is included in a
DBA's _____ role.
Select one:
a.
operative
b.
managerial
c.
technical
d.
arbitration
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Which of the following is NOT true about the dimensions component of star schema? They are
____.
Select one:
a.
qualifying characteristics that provide additional perspectives to a given fact
b.
of interest because decision support data is almost always viewed in relation to other data
c.
ways through which facts are studied
d.
stored in star schema table do for all
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Which one of the following describes the general condition in which a company operates?
Select one:
a.
Company situations
b.
Company operations
c.
Company structure
d.
Company conditions
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Query optimization functions are associated to which transparency feature of Distributed
Database Management System (DDBMS)?
Select one:
a.
Performance transparency
b.
Heterogeneity transparency
c.
Transaction transparency
d.
Distribution transparency
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In the context of RAID levels, _____ refers to writing the same data blocks to separate drives.
Select one:
a.
aggregating
b.
partitioning.
c.
mirroring
d.
striping
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SELECT
CUS_CODE, MAX(LINE_TOTAL)
FROM
CUSTOMER NATURAL JOIN INVOICE NATURAL JOIN LINE
WHERE
CUS_AREACODE = ‘615’
GROUP BY
CUS_CODE;
Based on the above query, what indexes would you recommend?
Select one:
a.
CUS_INVOICE
b.
CUS_CODE
c.
V_ CUS_AREACODE and CUS_CODE
d.
V_ CUS_AREACODE
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An multidimensional database management systems (MDBMS) uses proprietary techniques to
store data in _____ n-dimensional arrays.
Select one:
a.
matrix-like
b.
network-like
c.
table-like
d.
cube-like
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The most time consuming of all the phases in query processing is___.
Select one:
a.
Execution
b.
Parsing
c.
Fetching
d.
None of the phases is the most time consuming
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When designing a database you realised that a database column can have different values assigned to it.
________refers to the number of different values a column could possibly have.
Select one:
a.
Data sparsity
b.
Primary keys
c.
Column attributes
d.
Database statistics
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A cloud infrastructure built for the military is an example of ____.
Select one:
a.
Service cloud
b.
Public cloud
c.
Community cloud
d.
Private cloud
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Which of the following is covered during the evaluation process of database application.
Select one:
a.
Security auditing and monitoring
b.
Performance monitoring and tuning
c.
Enforcement of all data validation rules
d.
Vendor downtime history
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Most query optimization techniques are designed to make the optimizer’s work easier. Which
combination of the following factors should you keep in mind if you intend to write conditional
expressions in SQL code?
a. Use of conditional expressions with functions whenever possible
b. Numeric field comparisons are faster than character, date, and NULL comparisons
c. Equality comparisons are faster than inequality comparisons
d. When using multiple conditional expressions, write the equality conditions first
Choose one of the following that depict the factors you will consider.
Select one:
a.
a, b, & d
b.
a, b, c & d
c.
b, c, & d
d.
a, c and d
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Which of the following is true of a web application server?
Select one:
a.
It is automatically invoked by the browser when needed.
b.
It runs on the client machine, freeing server resources.
c.
It is Microsoft’s implementation of a superset of the SQL Access Group CLI standard for database
access.
d.
It provides security and authentication of users through user IDs and passwords.
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Enforcing and ensuring the security and privacy of data in the database are activities that
are performed at the ______.
Select one:
a.
Top management
b.
Middle management
c.
Operational management
d.
At all level of management
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Each time an end-user clicks a hyperlink, the browser generates a[n] _____ request that is sent to
the designated web server using the TCP/IP Internet protocol.
Select one:
a.
HTML
b.
XML
c.
HTTP GET
d.
API
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Distributed processing does not require:
Select one:
a.
an existing distributed database.
b.
processing function distribution to all storage sites.
c.
multiple sites to share processing chores.
d.
interconnected networks of components.
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The level of transparency supported by the DDBMS differs from system to system. Which of the
following is not an example of distributed transparency?
Select one:
a.
local mapping
b.
Transaction
c.
Location
d.
Fragmentation
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In the ADO.NET framework, the _____ is a disconnected, memory-resident representation of
the database.
Select one:
a.
Data Set
b.
Data Reader
c.
Command
d.
Data Adapter
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Data visualization has its roots in the _____ sciences, which focus on how the human brain
receives, interprets, organizes, and processes information.
Select one:
a.
social
b.
health
c.
developmental
d.
cognitive
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The data cache or _____ is a shared, reserved memory area that stores the most recently accessed
data blocks in RAM.
Select one:
a.
permanent storage
b.
procedure cache
c.
buffer cache
d.
SQL cache
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A _____ request lets a single SQL statement reference data located at several different local or
remote DP sites.
Select one:
a.
transaction
b.
fragmented
c.
distributed
d.
remote
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The _____ guarantees that if a portion of a transaction operation cannot be committed, all
changes made at the other sites participating in the transaction will be undone to maintain a
consistent database state.
Select one:
a.
coordinator protocol
b.
write-ahead protocol
c.
two-phase commit protocol (2PC)
d.
DO-UNDO-REDO protocol
Question 75
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The objective of query optimization functions is to minimize the total costs associated with the
execution of a database request. The costs associated with a request are functions of the following
EXCEPT?
Select one:
a.
CPU time cost
b.
The access time (I/O) cost
c.
End users access cost
d.
Communication cost
Question 76
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Database administration operations are commonly defined and divided according to the phases of
the _____.
Select one:
a.
DBLC
b.
SLA
c.
SDLC
d.
MRA
Question 77
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Assuming you have been hired by an organisation “data dynamics”. Your main responsibility is to
manage the entire organisation’s data set. Which of the following would you NOT consider as
characteristic for their data dictionary?
Select one:
a.
Relationships among data elements
b.
Access authorizations for all users of database
c.
Checklist of data duplication conflict
d.
Programs that access the database
Question 78
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_____ security breaches include database access by computer viruses and by hackers whose
actions are designed to destroy or alter data.
Select one:
a.
Preserving
b.
Corrupting
c.
Debilitative
d.
Destructive
Question 79
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Supposed you are given FIVE SQL statements to update the database of your company, upon the
execution of the first THREE statements, the computer system loses power due to load shedding
in your area and there is no backup power supply to complete the transaction. Assuming your
company uses database management system (DBMS) to support transaction management, what
function will the DBMS perform in this regards?
Select one:
a.
Save the executed transactions and roll back to the previously consistent state
b.
None of the option is correct
c.
Roll back the database to previously consistent state.
d.
Recover the database by saving the executed transactions to prevent database from moving into
inconsistent state
Question 80
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The DBA’s _______ role is focused on personnel management and on interactions with the enduser community.
Select one:
a.
Technical
b.
Arbitration
c.
Managerial
d.
Administrative
Question 81
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Which of the following is NOT among the desirable DDBMS transparency features?
Select one:
a.
Heterogeneity transparency
b.
Failure transparency
c.
Homogeneity transparency
d.
Distributed transparency
Question 82
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Decision on the appropriate use of index demands a knowledge of _______?
Select one:
a.
Optimization.
b.
Sparsity
c.
Extend
d.
Statists
Question 83
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The _____ component of a CASE tool produces the information system’s input/output formats.
Select one:
a.
partitioned
b.
replicated
c.
analysis
d.
centralized
Question 84
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Concurrency control with optimistic methods moves through which phases.
Select one:
a.
Read, write, and execute
b.
Read, write, and validate
c.
Read, write, and shrinking
d.
Read, validation, and growing
Question 85
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The DBMS ____ the SQL query and chooses the most efficient access or execution plan.
Select one:
a.
Executes
b.
Fetches
c.
Processes
d.
Parses
Question 86
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Which of the following is the first step of query processing at the DBMS server end?
Select one:
a.
Delivering
b.
Parsing
c.
Executing
d.
Fetching
Question 87
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From a data analyst’s point of view, decision support data differ from operational data in three
main areas: time span, granularity, and _____.
Select one:
a.
dimensionality
b.
usability
c.
sparsity
d.
transaction processing
Question 88
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One of the actions performed in database initial study is:
Select one:
a.
Analysing the company operation
b.
Solving problems and constraints
c.
Defining the questions
d.
Defining the scope and boundaries
Question 89
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Which Database Management System component is responsible for concurrency control?
Select one:
a.
Stamping
b.
Locks
c.
Optimistic
d.
Scheduler
Question 90
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Peter Kruger is a manager of a small product distribution company in Port Elizabeth. As the
business is fast growing, Peter sees the need to manage the massive information pool to help guide
the fast growth. Peter is familiar with spreadsheet software and he currently employs a sales force
of four people. Because of your knowledge and small experience in database, Peter approached you
to develop a data warehouse application prototype. This prototype will enable him to study sales
figures by year, region, salesperson, and product.
Based on this scenario, what would you identify as the appropriate dimension tables?
1. product
2. sale
3. year
4. region
5. salesperson
Select one:
a.
1, 3, 4, and 5
b.
1, 2, and 3
c.
2, 3, and 5
d.
2, 3, 4, and 5
Question 91
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A multi-user database allows for multiple accesses and updates to the database. ______ is the
transaction property that is particularly useful for this environment.
Select one:
a.
Atomicity
b.
Consistency
c.
Durability
d.
Isolation
Question 92
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During _____ data allocation, the database is divided into two or more disjointed parts
(fragments) and stored at two or more sites.
Select one:
a.
mixed
b.
centralized
c.
replicated
d.
partitioned
Question 93
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Managers are seldom interested in a specific sales invoice to customer X; rather, they tend to focus
on sales generated during the last month, the last year, or the last five years. This example would
be used to depict which one of the following?
Select one:
a.
Time span
b.
Dimensionality
c.
Optimisation
d.
Granularity
Question 94
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A DBA determines the initial size of the data files that make up the database; however, as
required, the data files can automatically expand in predefined increments known as _____.
Select one:
a.
Buffer cache
b.
Supplements
c.
Procedure cache
d.
Extents
Question 95
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At the top management level, the database must be able to______.
Select one:
a.
Monitor and control the allocation and use of company resource
b.
Enhance the company’s short-term operations
c.
Improve the likelihood of a positive return on investment
d.
Ensure the security evaluation
Question 96
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_____is the transparency that does not require the end user or programmer to know that a
database is partitioned.
Select one:
a.
Fragmentation transparency
b.
Heterogeneity transparency
c.
Local mapping transparency
d.
Location transparency
Question 97
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In the optimistic approach, during the_____ phase, a transaction scans the database, executes the
needed computations, and makes the updates to a private copy of the database values.
Select one:
a.
write
b.
Read
c.
shared
d.
validation
Question 98
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Of the following events, which is defined by ANSI as being equivalent to a COMMIT?
Select one:
a.
The end of a program is successfully reached.
b.
The program is abnormally terminated.
c.
Five SQL statements are executed.
d.
The database is shut down for maintenance.
Question 99
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The _____ approach to scheduling concurrent transactions assigns a global unique stamp to each
transaction.
Select one:
a.
table-locking
b.
unique
c.
scheduled
d.
time stamping
Question 100
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The statement “A transaction is a logical unit of work” is different from “a transaction is any
action that reads from or write to a database” Why?
Select one:
a.
Because with the former, multicomponent transaction must not be partly completed.
b.
Because the later is a signal statement that leaves database in a consistent state.
c.
The former is a collection of related statement that leaves database in an acceptable intermediate
state.