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Quiz on Ejemplo_1, created by renanvkas on 17/06/2015.
renanvkas
Quiz by renanvkas, updated more than 1 year ago More Less
Mª Carmen Ruiz Garcia
Created by Mª Carmen Ruiz Garcia over 9 years ago
ismael mesa domi
Copied by ismael mesa domi over 9 years ago
renanvkas
Copied by renanvkas over 9 years ago
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Resource summary

Question 1

Question
If the following command is executed: CREATE DATABASE test What is the page size (in kilobytes) of the database?
Answer
  • 4
  • 8
  • 16
  • 32

Question 2

Question
Given the following DDL statement: CREATE TABLE sales (item CHAR(20)); If a DBA wishes to increase the size of the ITEM column, which SQL statement needs to be used?
Answer
  • ALTER TABLE sales ADD COLUMN item CHAR(40);
  • ALTER TABLE sales ALTER COLUMN item CHAR(40);
  • ALTER TABLE sales MODIFY COLUMN item CHAR(40);
  • ALTER TABLE sales ALTER COLUMN item SET DATA TYPE CHAR(40);

Question 3

Question
Which DB2 object can be used to improve the execution performance of qualified SELECT statements?
Answer
  • Trigger
  • SQL Procedure
  • Sequence Object
  • Materialized Query Table

Question 4

Question
When is it appropriate to use a sequence?
Answer
  • When you want to control the order in which triggers are fired.
  • When you want to control the order in which stored procedures can be invoked.
  • When you want to automatically generate a numeric value that is not tied to any specific column or table.
  • When you want to automatically generate a numeric value for each row that is added to a specific table.

Question 5

Question
5.Which clause should be included in a ALTER TABLE statement to update a table definition with a new column?
Answer
  • ADD COLUMN
  • ALTER COLUMN
  • APPEND COLUMN
  • RENAME COLUMN

Question 6

Question
Which object is a stored procedure defined into?
Answer
  • Table
  • Schema
  • Package
  • Database

Question 7

Question
Which action needs to be performed in order to complete the definition of an application-period temporal table?
Answer
  • A transaction-start-id column must be defined for the table.
  • A history table must be defined and associated with the base table.
  • A BUSINESS_TIME period must be specified in a CREATE or ALTER of the table.
  • A unique index must be created that prevents overlapping of the BUSINESS_TIME period of the table.

Question 8

Question
What functionality allows users to perform a UNION operation between a DB2 table and an Oracle view?
Answer
  • Oracle connect
  • Trusted context
  • Oracle federation
  • Distributed request

Question 9

Question
You have a business need to query DB2 10 and DB2 9 databases and you want to write an application that can run on most platforms unchanged. Which interface would you use to achieve your goal?
Answer
  • CLI
  • XML
  • JDBC
  • RUBY

Question 10

Question
Which DB2 object is used to provide a logical grouping of other database objects?
Answer
  • Alias
  • Index
  • Schema
  • Collection

Question 11

Question
What are two valid objects that can be created in DB2? (Choose two.)
Answer
  • Tree
  • Node
  • Trigger
  • Contexts
  • Sequence

Question 12

Question
Which type of temporal table can be used to store only time-sensitive data?
Answer
  • Bitemporal
  • Time-period
  • System-period
  • Application-period

Question 13

Question
When an index is created for a table, where is the metadata for that index stored?
Answer
  • In the table definition
  • In the system catalog.
  • In the schema that the index resides in.
  • In the metadata of the table the index was created for.

Question 14

Question
Which product is used to customize execution environments for the purpose of controlling system resources so that one department or service class does not overwhelm the system?
Answer
  • pureScale
  • Workload manager
  • Data partitioning feature
  • Self-tuning memory manager

Question 15

Question
What type of mechanism is a simple token value that is used to refer to a much bigger large object (LOB)?
Answer
  • locator
  • pointer
  • address
  • reference

Question 16

Question
What type of large object (LOB) is used to store LOB data together with the formatted rows on data pages, instead of in a separate LOB storage object?
Answer
  • inline
  • binary
  • internal
  • partitioned

Question 17

Question
What is the purpose of the Query Tuner?
Answer
  • To automatically capture and stop rogue queries.
  • To provide recommendations and analysis for tuning a single query.
  • To provide recommendations and analysis for tuning up to 100 queries.
  • To recommend indexes and to guide DBAs through the process of creating new indexes.

Question 18

Question
Which tool allows users to connect to a DB2 database using a wizard?
Answer
  • Control Center
  • IBM Data Studio
  • Universal Connection Expert
  • DB2 Connection Pool Manager

Question 19

Question
Which two activities indicate the need for a data warehouse? (Choose two.)
Answer
  • Confirm product inventory.
  • Monitor product availability.
  • Summarize sales by region.
  • Identify patterns for products sold in the last five years.
  • Associate one or more products with a purchase order.

Question 20

Question
What is the primary function of an Online Transaction Processing (OLTP) workload?
Answer
  • To combine data from multiple sources.
  • To discover hidden relationships in data.
  • To analyze large amounts of data to find patterns.
  • To make changes to a small number of records within a single transaction.

Question 21

Question
Which isolation level offers the greatest protection of data but provides the least amount of concurrency?
Answer
  • Read Stability (RS)
  • Cursor Stability (CS)
  • Repeatable Read (RR)
  • Uncommitted Read (UR)

Question 22

Question
What factor influences lock escalation?
Answer
  • Table size
  • Buffer space
  • Number of locks
  • Available real storage

Question 23

Question
Which type of lock allows the lock owner and all concurrent applications to read, but not update, the locked data?
Answer
  • Share (S)
  • Update (U)
  • Exclusive (X)
  • Intent Exclusive (IX)

Question 24

Question
Application APP_A is performing updates to table TAB1 using the cursor stability (CS) isolation level. If application APP_B wants to retrieve all rows from table TAB1 without waiting for application APP_A to finish making updates, what isolation level must application APP_B use?
Answer
  • Read Stability (RS)
  • Repeatable Read (RR)
  • Uncommitted Read (UR)
  • Cursor Stability (CS)

Question 25

Question
Which statement will prevent concurrent application processes from performing anything other than read-only operations against a table named TAB1?
Answer
  • LOCK TABLE tab1 IN READ MODE
  • LOCK TABLE tab1 IN SHARE MODE
  • LOCK TABLE tab1 IN EXCLUSIVE MODE
  • LOCK TABLE tab1 IN READ-ONLY MODE

Question 26

Question
When is an INTENT EXCLUSIVE (IX) lock required?
Answer
  • When a transaction intends to read or change data.
  • When a transaction intends to change but not read data.
  • When a transaction intends to read but not change data.
  • When a transaction intends to change the system catalog.

Question 27

Question
What is the act of exchanging one lock an application holds on a resource for a more restrictive lock on the same resource known as?
Answer
  • Lock escalation
  • Lock substitution
  • Lock switch/exchange
  • Lock conversion/promotion

Question 28

Question
What isolation level prevents dirty reads, nonrepeatable reads, and phantoms?
Answer
  • Read stability (RS)
  • Cursor stability (CS)
  • Repeatable read (RR)
  • Uncommitted read (UR)

Question 29

Question
Which operation normally does NOT require an exclusive lock?
Answer
  • BIND
  • DROP
  • GRANT
  • SELECT

Question 30

Question
When a COMMIT statement is executed, what happens?
Answer
  • All locks held on the database are automatically released.
  • Data stored in global temporary tables is automatically deleted.
  • Open cursors defined WITH HOLD are closed, but their data is retained.
  • The current transaction is terminated and a new transaction boundary is started.

Question 31

Question
Which command is used to back out a subset of database changes that have been made within a unit of work?
Answer
  • COMMIT
  • ROLLBACK
  • COMMIT TO SAVEPOINT
  • ROLLBACK TO SAVEPOINT

Question 32

Question
An SQL function designed to convert temperatures from Fahrenheit to Celsius was created as follows: CREATE FUNCTION conv_temp (IN temp_f FLOAT RETURNS INTEGER NO EXTERNALACTION SPECIFIC convert_ftoc RETURN INT ((temp_f -32)/1.8) How can this function be used to convert average temperature (AVG_TEMP) data stored in a table called CLIMATE_INFO?
Answer
  • CALL conv_temp(climate_info.avg_temp);
  • CALL convert_ftoc(climate_info.avg_temp);
  • SELECT conv_temp(avg_temp) FROM climate_info;
  • SELECT convert_ftoc(avg_temp) FROM climate_info;

Question 33

Question
If a table named MY_TAB contains 100 rows and the following statement is executed: DELETE FROM (SELECT * FROM my_tab ORDER BY col1 DESC FETCH FIRST 5 ROWS ONLY) AS tmp; What will happen?
Answer
  • The last 5 rows in the table will be deleted.
  • The first 5 rows in the table will be deleted.
  • The statement will fail because a subquery cannot be used with a DELETE statement.
  • The statement will fail because a table name was not specified with the DELETE statement.

Question 34

Question
Given an EMPLOYEES table and a SALES table, a user wants to produce a list of all employees and their associated revenue, even if no revenue exists. Which SQL statement will produce the desired list?
Answer
  • SELECT employees.name, sales.revenue FROM employees INNER JOIN sales ON employees.id = sales.emp_id
  • SELECT employees.name, sales.revenue FROM employees INNER JOIN sales ON sales.emp_id = employees.id
  • SELECT employees.name, sales.revenue FROM sales LEFT OUTER JOIN employees ON employees.id = sales.emp_id
  • SELECT employees.name, sales.revenue FROM sales RIGHT OUTER JOIN employees ON employees.id = sales.emp_id

Question 35

Question
Which two operations are allowed in the body of an SQL scalar user-defined function? (Choose two.)
Answer
  • CALL statements.
  • External file access.
  • Use of a scratch pad.
  • COMMIT statements.
  • SQL control statements.

Question 36

Question
Which command will delete all rows from a table without generating log records?
Answer
  • TRIM
  • DROP
  • DELETE
  • TRUNCATE

Question 37

Question
Which function can be used to obtain values from XML documents that are to be inserted into one or more tables?
Answer
  • XMLTABLE
  • XMLPARSE
  • XMLEXISTS
  • XMLATTRIBUTES

Question 38

Question
User USER1 wants to retrieve records from a table named EMPLOYEE that satisfy at least one of the following criteria: -The employee's hire date (HIREDATE) is before 1999 and the employee's salary (SALARY) is less than $40,000.00 a year. -The employee has attended university Which SQL statement will accomplish this?
Answer
  • SELECT * FROM employee WHERE (hiredate < '1999-01-01' AND salary < 40000) OR (education ='University')
  • SELECT * FROM employee WHERE (hiredate < '1999-01-01') OR (salary < 40000) OR (education ='University')
  • SELECT * FROM employee WHERE (hiredate < '1999-01-01' OR (salary < 40000 AND (education ='University')
  • SELECT * FROM employee WHERE (hiredate < '1999-01-01' AND salary < 40000 AND (education ='University')

Question 39

Question
Which SQL statement will retrieve the employee number (EMPNO), hire date (HIREDATE), and salary (SALARY) for each employee from a table named EMPLOYEE who was hired before 1998 and earns a salary of less than $35,000.00 per year?
Answer
  • SELECT empno, hiredate, salary FROM employee FOR hiredate < '1998-01-01' AND salary < 35000
  • SELECT empno, hiredate, salary FROM employee WHERE hiredate < '1998-01-01' AND salary < 35000
  • SELECT empno, hiredate, salary FROM employee WHERE hiredate < '1998-01-01' OR salary < 35000
  • SELECT empno, hiredate, salary FROM employee FOR hiredate < '1998-01-01' OR salary < 35000

Question 40

Question
If the following result set is desired: Which SQL statement must be executed?
Image:
5da97b86-353a-4b95-9bf5-61d00557bd00.PNG (image/PNG)
Answer
  • SELECT lastname, firstnme, salary, job FROM employee ORDER BY 3 FETCH FIRST 5 ROWS ONLY
  • SELECT lastname, firstnme, salary, job FROM employee ORDER BY 3 DESC FETCH FIRST 5 ROWS ONLY
  • SELECT lastname, firstnme, salary, job FROM employee ORDER BY 3 FETCH FIRST 5 ROWS
  • SELECT lastname, firstnme, salary, job FROM employee ORDER BY 3 DESC FETCH FIRST 5 ROWS

Question 41

Question
Which statement about INSERT operations is true?
Answer
  • The INSERT statement is used to insert rows into a table, view, or table function.
  • Inserted values must satisfy the conditions of any check constraints defined on the table.
  • If an INSERT statement omits any column from the inserted row that is defined as NULL or NOT NULL WITH DEFAULT, the statement will fail.
  • If the underlying table of a view being referenced by an INSERT statement has one or more unique indexes, each row inserted does not have to conform to the constraints imposed by those indexes.

Question 42

Question
Which statement about application-period temporal tables is true?
Answer
  • Consists of explicitly-supplied timestamps and a separate associated history table.
  • Is based on explicitly-supplied timestamps that define the time periods during which data is valid.
  • Is useful when one wants to keep both user-based period information and system-based historical information.
  • Consists of a pair of columns with database-manager maintained values that indicate the period when a row is current.

Question 43

Question
Which SQL statement should be used to select the minimum and maximum salaries (SALARY), by job code (JOB), from a table EMPLOYEE?
Answer
  • SELECT job, MIN(salary), MAX(salary) FROM employee GROUP BY job;
  • SELECT job, MIN(salary), MAX(salary) FROM employee ORDER BY job;
  • SELECT job, MIN(salary), MAX(salary) FROM employee GROUP BY job, MIN(salary), MAX(salary);
  • SELECT JOB, MIN(salary), MAX(salary) FROM employee ORDER BY job, MIN(salary), MAX(salary);

Question 44

Question
In a trusted context environment, if a switch request is made with an authorization ID that is not allowed on a trusted connection, what state is the connection placed in?
Answer
  • Locked
  • Waiting
  • Pending
  • Unconnected

Question 45

Question
If a user has been granted SYSCTRL authority, which activities can they perform?
Answer
  • Load operations
  • Backup/copy table spaces
  • Create and drop databases
  • Monitor database performance

Question 46

Question
What is the purpose of a role?
Answer
  • To define exactly what a specific user can do within a particular database once they have been authenticated.
  • To group a collection of privileges together so that they can be simultaneously granted to and revoked from multiple users.
  • To establish a credible relationship between DB2 and an external entity, such as a database administrator or a middleware server.
  • To group a collection of users together so that they can be simultaneously granted and revoked specific authorities and privileges.

Question 47

Question
Which SQL statement will give user USER1 the ability to assign a comment to a sequence named MYSEQ?
Answer
  • GRANT ALTER ON SEQUENCE myseq TO user1
  • GRANT USAGE ON SEQUENCE myseq TO user1
  • GRANT SELECT ON SEQUENCE myseq TO user1
  • GRANT COMMENT ON SEQUENCE myseq TO user1

Question 48

Question
A column mask that is to be used for row and column access control (RCAC) was created with the DISABLE option specified. What must be done if this mask is to be used to restrict access to data stored in a table named EMPLOYEE?
Answer
  • The column mask must be enabled; the EMPLOYEE table must be altered to activate column access control.
  • The column mask must be enabled (column access control for the EMPLOYEE table will be activated automatically).
  • The EMPLOYEE table must be altered to activate column access control (the column mask will be enabled automatically).
  • The EMPLOYEE table must be altered to activate column access control; row permission must be granted to everyone who needs to use thecolumn mask.

Question 49

Question
User USER1 holds both DBADM and SECADM authority and you want to separate database administration activities from security administration tasks. What authority must you have in order to revoke SECADM authority from user USER1 and assign it to someone else?
Answer
  • DBADM
  • DBCTRL
  • SECADM
  • DBMAINT

Question 50

Question
A table named EMPLOYEE was created as follows: Which action will prevent unauthorized users from accessing SSN data?
Image:
95a6f1b1-306d-427c-8c24-268b432e6917.PNG (image/PNG)
Answer
  • Assign the SSN column to a restricted role that only authorized users can access.
  • Only grant ACCESSCTRL authority for the SSN column to users who need to access SSN data.
  • Alter the table definition so that SSN data is stored in a separate schema that only authorized users can access.
  • Create a view for the EMPLOYEE table that does not contain the SSN column and require unauthorized users to use the view.

Question 51

Question
Which SQL statement will allow user USER1 to create a view on a table named EMPLOYEE?
Answer
  • GRANT CREATETAB ON DATABASE TO user1
  • GRANT SELECT ON TABLE employee TO user1
  • GRANT CREATEVIEW ON DATABASE TO user1
  • GRANT REFERENCES ON TABLE employee TO user1

Question 52

Question
A new user named USER1 needs to retrieve information from a database named MYDB. What authority must be granted to user USER1?
Answer
  • DBCTRL authority
  • SQLADM authority
  • DATAACCESS authority
  • ACCESSCTRL authority

Question 53

Question
Which privilege is required to invoke a user defined function?
Answer
  • CALL
  • USAGE
  • EXECUTE
  • REFERENCES

Question 54

Question
Which statement is true about an index that is used to support a UNIQUE constraint?
Answer
  • It must not contain more than one column.
  • It cannot be used in a referential constraint.
  • It must be defined with the UNIQUE attribute.
  • It must be defined as UNIQUE WHERE NOT NULL.

Question 55

Question
Which statement regarding triggers is true?
Answer
  • Only one INSERT, UPDATE, or DELETE trigger can be defined per table.
  • Triggers cannot be modified, they must be dropped and recreated with new definitions.
  • Adding a trigger to a table that already has rows in it will cause triggered actions to be fired.
  • Triggers can only be fired one time per statement irrespective of the number of rows affected.
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