13986861
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Quiz von Brandon Gagon, aktualisiert more than 1 year ago
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Erstellt von Brandon Gagon
vor etwa 7 Jahre
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Frage 1
Frage
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
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They create automatic backups
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They help create an environment for end users to have access to more data
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They provide seamless Internet access to database data
Frage 2
Frage
The hierarchical database model is based on a ____.
Antworten
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tree structure
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lack of a parent segment
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lack of a child segment
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matrix
Frage 3
Frage
Because an RDBMS hides the system's complexity from the user/designer, ____.
Antworten
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it does not exhibit data independence
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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
Frage
The ERD is used to graphically represent the ____ database model.
Antworten
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condensed
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physical
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logical
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conceptual
Frage 5
Frage
The property of ____ enables an entity subtype to inherit the attributes and relationships of the supertype.
Antworten
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subtype discriminator
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inheritance
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specialization hierarchy
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entity supertype
Frage 6
Frage
At the implementation level, the supertype and its subtype(s) depicted in the specialization hierarchy maintain a ____ relationship.
Antworten
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none
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1:1
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1:M
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M:N
Frage 7
Frage
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';
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REMOVE FROM PRODUCT WHERE P_CODE = '2238/QPD';
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ERASE FROM PRODUCT WHERE P_CODE = '2238/QPD';
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ROLLBACK FROM PRODUCT WHERE P_CODE = '2238/QPD';
Frage 8
Frage
Which command is used to select partial table contents?
Antworten
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SELECT <column(s)> FROM <Table name> WHERE <Item>;
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LIST <column(s)> FROM <Table name> WHERE <Conditions>;
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SELECT <column(s)> FROM <Table name> WHERE <Conditions>;
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LIST<column(s)> FROM <Table name> WHERE <Item>;
Frage 9
Frage
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;
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SELECT P_DESCRIPT, P_INDATE, P_PRICE, V_CODE FROM PRODUCT WHERE V_CODE <= 21344;
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SELECT P_DESCRIPT, P_INDATE, P_PRICE, V_CODE FROM PRODUCT WHERE V_CODE = 21344;
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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
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SELECT P_CODE, P_DESCRIPT, P_INDATE, P_PRICE FROM PRODUCT SEQUENCE BY P_PRICE;
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SELECT P_CODE, P_DESCRIPT, P_INDATE, P_PRICE FROM PRODUCT LIST BY P_PRICE;
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SELECT P_CODE, P_DESCRIPT, P_INDATE, P_PRICE FROM PRODUCT ORDER BY P_PRICE;
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SELECT P_CODE, P_DESCRIPT, P_INDATE, P_PRICE FROM PRODUCT ASCENDING BY P_PRICE;
Frage 11
Frage
The basic SQL aggregate function that gives the total of all values for a selected attribute in a given column is ____.
Antworten
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COUNT
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MIN
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MAX
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SUM
Frage 12
Frage
____ is used to tally the number of specific "values" of an attribute.
Antworten
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SUM
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TOTAL
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COUNT
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ADD
Frage 13
Frage
UPDATE tablename
*****
[WHERE conditionlist];
What command replaces the ***** in the above statement?
Antworten
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SET columnname = expression
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columnname = expression
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expression = columnname
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LET columnname = expression
Frage 14
Frage
When using a(n) ____ join, only rows that meet the given criteria are returned.
Antworten
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full
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inner
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outer
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set
Frage 15
Frage
What is the syntax for a left outer join?
Antworten
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SELECT column-list FROM table1 OUTER JOIN table2 LEFT WHERE join-condition
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SELECT column-list FROM table1 LEFT [OUTER] JOIN table2 ON join-condition
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SELECT column-list WHERE LEFT table1 = table 2
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SELECT column-list FROM table1 LEFT table2 [JOIN] WHERE join-condition
Frage 16
Frage
In subquery terminology, the first query in the SQL statement is known as the ____ query.
Antworten
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outer
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left
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inner
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base
Frage 17
Frage
In a subquery, which query is executed first?
Antworten
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leftmost
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rightmost
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innermost
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outermost
Frage 18
Frage
Creating the conceptual design, selecting DBMS software, creating the logical design, and creating the physical design are part of the ____ phase.
Antworten
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database initial study
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database design
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implementation and loading
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testing and evaluation
Frage 19
Frage
Which of the conceptual design steps defines entities, attributes, and relationships?
Antworten
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Database analysis and requirements
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Entity relationship modeling and normalization
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Data model verification
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Distributed database design
Frage 20
Frage
What is the primary objective of database design?
Antworten
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To create the most efficient database possible
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To create complete, normalized, nonredundant, and fully integrated conceptual, logical, and physical database models
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To create the fastest queries
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To be able to add data quickly
Frage 21
Frage
The most common algorithms for concurrency control are locks, ____ stamping, and optimistic methods.
Antworten
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date
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time
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hour
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minute
Frage 22
Frage
____ requires that all operations of a transaction be completed.
Antworten
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Specificity
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Atomicity
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Durability
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Time Stamping
Frage 23
Frage
The ____ establishes the order in which the operations within concurrent transactions are executed.
Antworten
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transaction log
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timer
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lock manager
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scheduler
Frage 24
Frage
When is the implicit beginning of a transaction?
Antworten
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When the database is started
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When a table is accessed for the first time
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When the first SQL statement is encountered
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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
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growing
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shrinking
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locking
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unlocking
Frage 26
Frage
What is a consistent database?
Antworten
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One in which all tables have foreign keys
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One in which all data integrity constraints are satisfied
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One in which all tables are normalized
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One in which all SQL statements only update one table at a time
Frage 27
Frage
A transaction acquires a ____ prior to data access.
Antworten
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grain
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timestamp
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lock
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key
Frage 28
Frage
Changes are permanently applied to the database during the ____ phase of a transaction.
Antworten
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commit
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write
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input
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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
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lost updates
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uncommitted data
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transaction failure
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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
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lost updates
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uncommitted data
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transaction failures
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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
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durability
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isolation
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atomicity
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serializability
Frage 32
Frage
Which is not a DML statement?
Antworten
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CREATE TABLE
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SELECT
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INSERT
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DELETE
Frage 33
Frage
What feature is a DDBMS disadvantage?
Antworten
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Data is located near the "greatest demand" site
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Growth facilitation
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Reduced operating cost
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lack of standards
Frage 34
Frage
What feature is a DDBMS advantage?
Antworten
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Greater difficulty in managing the data environment
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Less danger of a single-point failure
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Increased training cost
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Complexity of management and control
Frage 35
Frage
____ distributed database systems integrate different types of centralized DBMSs over a network.
Antworten
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Homogeneous
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Heterogeneous
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Fully homogeneous
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Fully heterogeneous
Frage 36
Frage
____ transparency allows a transaction to update data at several network sites.
Antworten
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Transaction
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Distribution
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Failure
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Performance
Frage 37
Frage
____ transparency ensures that the system will continue to operate in the event of a node failure.
Antworten
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Transaction
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Distribution
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Failure
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Performance
Frage 38
Frage
The ____ contains the description of the entire database as seen by the database administrator.
Antworten
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distributed global dictionary
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distributed data dictionary
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distributed global schema
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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
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Dynamic
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Automatic
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Commit
Frage 40
Frage
____ query optimization takes place at execution time.
Antworten
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Automatic
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Static
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Manual
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Dynamic
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