Frage 1
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Which of the following is a benefit of using a DBMS?
Antworten
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They provide full security to data using private/public key encryption
-
They create automatic backups
-
They help create an environment for end users to have access to more data
-
They provide seamless Internet access to database data
Frage 2
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The hierarchical database model is based on a ____.
Antworten
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tree structure
-
lack of a parent segment
-
lack of a child segment
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matrix
Frage 3
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Because an RDBMS hides the system's complexity from the user/designer, ____.
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it does not exhibit data independence
-
it does not exhibit structural independence
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data management is easier
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data management is very difficult
Frage 4
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The ERD is used to graphically represent the ____ database model.
Antworten
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condensed
-
physical
-
logical
-
conceptual
Frage 5
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The property of ____ enables an entity subtype to inherit the attributes and relationships of the supertype.
Antworten
-
subtype discriminator
-
inheritance
-
specialization hierarchy
-
entity supertype
Frage 6
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At the implementation level, the supertype and its subtype(s) depicted in the specialization hierarchy maintain a ____ relationship.
Frage 7
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Which command would be used to delete the table row where the P_Code = '2238/QPD'?
Antworten
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DELETE FROM PRODUCT
WHERE P_CODE = '2238/QPD';
-
REMOVE FROM PRODUCT
WHERE P_CODE = '2238/QPD';
-
ERASE FROM PRODUCT
WHERE P_CODE = '2238/QPD';
-
ROLLBACK FROM PRODUCT
WHERE P_CODE = '2238/QPD';
Frage 8
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Which command is used to select partial table contents?
Antworten
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SELECT <column(s)>
FROM <Table name>
WHERE <Item>;
-
LIST <column(s)>
FROM <Table name>
WHERE <Conditions>;
-
SELECT <column(s)>
FROM <Table name>
WHERE <Conditions>;
-
LIST<column(s)>
FROM <Table name>
WHERE <Item>;
Frage 9
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Which query will output the table contents when the value of V_CODE is equal to 21344?
Antworten
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SELECT P_DESCRIPT, P_INDATE, P_PRICE, V_CODE
FROM PRODUCT
WHERE V_CODE <> 21344;
-
SELECT P_DESCRIPT, P_INDATE, P_PRICE, V_CODE
FROM PRODUCT
WHERE V_CODE <= 21344;
-
SELECT P_DESCRIPT, P_INDATE, P_PRICE, V_CODE
FROM PRODUCT
WHERE V_CODE = 21344;
-
SELECT P_DESCRIPT, P_INDATE, P_PRICE, V_CODE
FROM PRODUCT
WHERE V_CODE => 21344;
Frage 10
Frage
What is the command used to list the P_CODE, P_DESCRIPT, P_INDATE, and P_PRICE fields from the Product table in ascending order by P_PRICE?
Antworten
-
SELECT P_CODE, P_DESCRIPT, P_INDATE, P_PRICE
FROM PRODUCT
SEQUENCE BY P_PRICE;
-
SELECT P_CODE, P_DESCRIPT, P_INDATE, P_PRICE
FROM PRODUCT
LIST BY P_PRICE;
-
SELECT P_CODE, P_DESCRIPT, P_INDATE, P_PRICE
FROM PRODUCT
ORDER BY P_PRICE;
-
SELECT P_CODE, P_DESCRIPT, P_INDATE, P_PRICE
FROM PRODUCT
ASCENDING BY P_PRICE;
Frage 11
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The basic SQL aggregate function that gives the total of all values for a selected attribute in a given column is ____.
Frage 12
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____ is used to tally the number of specific "values" of an attribute.
Frage 13
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UPDATE tablename
*****
[WHERE conditionlist];
What command replaces the ***** in the above statement?
Frage 14
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When using a(n) ____ join, only rows that meet the given criteria are returned.
Frage 15
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What is the syntax for a left outer join?
Antworten
-
SELECT column-list
FROM table1 OUTER JOIN table2 LEFT
WHERE join-condition
-
SELECT column-list
FROM table1 LEFT [OUTER] JOIN table2
ON join-condition
-
SELECT column-list
WHERE LEFT table1 = table 2
-
SELECT column-list
FROM table1 LEFT table2 [JOIN]
WHERE join-condition
Frage 16
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In subquery terminology, the first query in the SQL statement is known as the ____ query.
Frage 17
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In a subquery, which query is executed first?
Antworten
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Leftmost
-
Rightmost
-
Innermost
-
Outermost
Frage 18
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Creating the conceptual design, selecting DBMS software, creating the logical design, and creating the physical design are part of the ____ phase.
Frage 19
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Which of the conceptual design steps defines entities, attributes, and relationships?
Antworten
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Database analysis and requirements
-
Entity relationship modeling and normalization
-
Data model verification
-
Distributed database design
Frage 20
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What is the primary objective of database design?
Antworten
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To create the most efficient database possible
-
To create complete, normalized, non-redundant, and fully integrated conceptual, logical, and physical database models
-
To create the fastest queries
-
To be able to add data quickly
Frage 21
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The most common algorithms for concurrency control are locks, ____ stamping, and optimistic methods.
Frage 22
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____ requires that all operations of a transaction be completed.
Antworten
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Specificity
-
Atomicity
-
Durability
-
Time stamping
Frage 23
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The ____ establishes the order in which the operations within concurrent transactions are executed.
Antworten
-
transaction log
-
timer
-
lock manager
-
scheduler
Frage 24
Frage
When is the implicit beginning of a transaction?
Antworten
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When the database is started
-
When a table is accessed for the first time
-
When the first SQL statement is encountered
-
When the COMMIT command is issued
Frage 25
Frage
A(n) ____ phase in a two-phase lock is when a transaction releases all locks and cannot obtain any new lock.
Antworten
-
growing
-
shrinking
-
locking
-
unlocking
Frage 26
Frage
What is a consistent database?
Antworten
-
One in which all tables have foreign keys
-
One in which all data integrity constraints are satisfied
-
One in which all tables are normalized
-
One in which all SQL statements only update one table at a time
Frage 27
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A transaction acquires a ____ prior to data access.
Frage 28
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Changes are permanently applied to the database during the ____ phase of a transaction.
Antworten
-
commit
-
write
-
input
-
output
Frage 29
Frage
The phenomenon of ____ occurs when two transactions, T1 and T2, are executed concurrently and the first transaction (T1) is rolled back after the second transaction (T2) has already accessed the uncommitted data—thus violating the isolation property of transactions.
Antworten
-
lost updates
-
uncommitted data
-
transaction failure
-
inconsistent retrieval
Frage 30
Frage
____ occur when a transaction calculates some summary (aggregate) functions over a set of data while other transactions are updating the data.
Antworten
-
Lost updates
-
Uncommitted data
-
Transaction failures
-
Inconsistent retrievals
Frage 31
Frage
The scheduler facilitates data ____ to ensure that two transactions do not update the same data element at the same time.
Antworten
-
durability
-
isolation
-
atomicity
-
serializability
Frage 32
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Which is not a DML statement?
Antworten
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CREATE TABLE
-
SELECT
-
INSERT
-
DELETE
Frage 33
Frage
What feature is a DDBMS disadvantage?
Frage 34
Frage
What feature is a DDBMS advantage?
Antworten
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Greater difficulty in managing the data environment
-
Less danger of a single-point failure
-
Increased training cost
-
Complexity of management and control
Frage 35
Frage
____ distributed database systems integrate different types of centralized DBMSs over a network.
Antworten
-
Homogeneous
-
Heterogeneous
-
Fully homogeneous
-
Fully heterogeneous
Frage 36
Frage
____ transparency allows a transaction to update data at several network sites.
Antworten
-
Transaction
-
Distribution
-
Failure
-
Performance
Frage 37
Frage
____ transparency ensures that the system will continue to operate in the event of a node failure.
Antworten
-
Transaction
-
Distribution
-
Failure
-
Performance
Frage 38
Frage
The ____ contains the description of the entire database as seen by the database administrator.
Antworten
-
distributed global dictionary
-
distributed data dictionary
-
distributed global schema
-
distributed data schema
Frage 39
Frage
____ query optimization means that the DDBMS finds the most cost-effective access path without user intervention.
Antworten
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Static
-
Dynamic
-
Automatic
-
Commit
Frage 40
Frage
____ query optimization takes place at execution time.
Antworten
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Automatic
-
Static
-
Manual
-
Dynamic
Frage 41
Frage
A ____ based query optimization algorithm uses statistical information about the database.
Antworten
-
statistically
-
dynamic
-
rule
-
manual
Frage 42
Frage
Data ____ refers to the storage of data copies at multiple sites served by a computer network.
Antworten
-
replication
-
fragmentation
-
persistence
-
optimization
Frage 43
Frage
To provide better performance, some OLAP systems merge the data warehouse and data mart approaches by storing small extracts of the data warehouse at end user ____.
Antworten
-
workstations
-
queries
-
schemas
-
servers
Frage 44
Frage
____ makes a copy of a table and places it in a different location, to improve access time.
Antworten
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Periodicity
-
Aggregation
-
Partitioning
-
Replication
Frage 45
Frage
The ____ schema creates the near equivalent of a multidimensional database schema from the existing relational database.
Frage 46
Frage
Using multidimensional jargon, the ability to focus on slices of the cube to perform a more detailed analysis is known as ____.
Antworten
-
star cuts
-
slice and dice
-
microscoping
-
TPL processing
Frage 47
Frage
A ____ is a uniquely identifiable object that allows a given person to log on to the database.
Antworten
-
user
-
role
-
profile
-
manager
Frage 48
Frage
Which DDL statement should be used to enforce referential integrity?
Antworten
-
CREATE TRIGGER AFTER GRANT
-
CREATE TRIGGER BEFORE UPDATE
-
CREATE TRIGGER BEFORE DROP
-
CREATE TRIGGER AFTER SELECT
Frage 49
Frage
Use the given code to answer the following question:
SELECT branchNo, COUNT(staffNo) AS myCount, SUM (salary) AS mySum
FROM staff,
GROUP BY branchNo
ORDER By branchNo;
What does this code do?
Antworten
-
Orders the staff table by the ascending order of branchNo
-
Orders the staff by ascending order of salary
-
Finds the number of staff and the sum of their salaries in each branch
-
Finds the total number of branches
Frage 50
Frage
Use the give DDL statement to answer the following question:
CREATE ASSERTION PhysicianNotOverbooked
CHECK (NOT EXISTS (SELECT physician_number
FROM scheduled_exams
GROUP By physician_number
HAVING COUNT (*) > 20));
Which action is this statement performing?
Frage 51
Frage
Which DCL Command gives Manager the privilege to SELECT on column AccountBalance of the table Customer?
Antworten
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GRANT SELECT (Customer) ON AccountBalance TO Manager;
-
GRANT SELECT (AccountBalance) ON Customer TO Manager;
-
PERMIT Manager SELECT ON Customer (AccountBalance);
-
ALLOW Manager SELECT AccountBalance FROM Customer;
Frage 52
Frage
Which statement produces a PL/SQL stored procedure?
Antworten
-
INSERT OR SET PROCEDURE ProcessReport AS
BEGIN SELECT * FROM sales END
-
CREATE OR REPLACE PROCEDURE ProcessReport AS
BEGIN SELECT * FROM sales END
-
ADD OR UPDATE PROCEDURE ProcessReport AS
BEGIN SELECT * FROM sales END
-
INSERT OR UPDATE PROCEDURE ProcessReport AS
BEGIN SELECT * FROM sales END