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IBM Db2 12 for z/OS Administrator Practice Test

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IBM
C1000-078
IBM Db2 12 for zOS Administrator
https://killexams.com/pass4sure/exam-detail/C1000-078
Question: 1
When the Db2 subsystem is in an abnormal condition, which utility control
statement can be used to start the subsystem in a restricted mode to perform
recovery or maintenance tasks?
A. START DB2 ACCESS(MAINT)
B. DISPLAY THREAD
C. RECOVER SYSUTIL
D. TERM UTILITY
Answer: A
Explanation: The START DB2 ACCESS(MAINT) command can be used to
start the Db2 subsystem in a restricted mode, which allows only maintenance-
related activities to be performed. This can be useful in situations where the
subsystem is in an abnormal condition and needs to be brought back online in a
limited capacity to perform recovery or other maintenance tasks.
Question: 2
Which utility control statement can be used to recover the SYSUTIL catalog
table in the event of a failure or abnormal condition?
A. DISPLAY THREAD
B. START DB2
C. RECOVER SYSUTIL
D. TERM UTILITY
Answer: C
Explanation: The RECOVER SYSUTIL command can be used to recover the
SYSUTIL catalog table, which stores information about active utility jobs, in
the event of a failure or abnormal condition. This can be useful in restoring the
SYSUTIL table to a known, consistent state.
Question: 3
What are the critical Db2 system parameters that should be carefully set and
tuned?
A. Buffer pool sizes
B. Log data set sizes
C. Locking and concurrency parameters
D. All other Options
Answer: D
Explanation: The critical Db2 system parameters that should be carefully set
and tuned include:
Buffer pool sizes: Properly sizing the buffer pools can significantly impact the
performance of Db2 applications.
Log data set sizes: Ensuring that the log data sets are large enough to
accommodate the workload can prevent performance issues and outages.
Locking and concurrency parameters: Tuning the locking and concurrency
parameters can help manage resource contention and Excellerate the overall
performance of the Db2 system.
Question: 4
What is the purpose of a BUSINESS_TIME period in Db2?
A. To automatically generate unique values for a column, such as a surrogate
key
B. To define a default value that will be assigned to a column if no value is
provided
C. To define a condition or range of acceptable values for a column
D. To track the validity period of a row in a slowly changing dimension table
Answer: D
Explanation: A BUSINESS_TIME period in Db2 is used to track the validity
period of a row in a slowly changing dimension table. This feature allows you
to maintain a history of changes to the data, enabling temporal queries and
analyses. The BUSINESS_TIME period is defined using two columns that
represent the start and end dates of the row's validity period, contributing to the
overall data integrity by preserving the historical evolution of the data.
Question: 5
Which Db2 utility is used to apply log records to a table space during an
incremental recovery operation?
A. COPY
B. RECOVER
C. QUIESCE
D. RESTORE
Answer: B
Explanation: The RECOVER utility in Db2 is responsible for applying the
necessary log records to a table space during an incremental recovery
operation, in order to bring the data to a consistent point in time.
Question: 6
What is the purpose of using the REBIND command in Db2?
A. To load data into a table
B. To recover data to a consistent point in time
C. To reorganize a table
D. To update the access paths for SQL statements
Answer: D
Explanation: The REBIND command in Db2 is used to update the access paths
for SQL statements. This is necessary when changes are made to the database,
such as the addition or modification of indexes, which can affect the optimal
access path chosen by the Db2 optimizer.
Question: 7
How can you drop an existing trigger from a Db2 table?
A. Use the DROP TRIGGER command.
B. Use the ALTER TABLE command with the DROP TRIGGER clause.
C. Use the MODIFY TABLE command with the DELETE TRIGGER clause.
D. Triggers cannot be dropped from existing tables in Db2.
Answer: A
Explanation: To drop an existing trigger from a Db2 table, you can use the
DROP TRIGGER command. This allows you to remove the trigger from the
table without having to drop and recreate the entire table.
Question: 8
Which Db2 utility is used to establish a point of consistency for a table space?
A. COPY
B. RECOVER
C. QUIESCE
D. RESTORE
Answer: C
Explanation: The QUIESCE utility in Db2 is used to establish a point of
consistency for a table space, which can be used as a reference point for
recovery operations.
Question: 9
Which Db2 privilege is required to create a stored procedure?
A. SYSADM
B. DBADM
C. CREATEPROC
D. GRANT
Answer: C
Explanation: The CREATEPROC privilege is required to create a stored
procedure in Db2. This privilege allows the user to create, alter, and drop stored
procedures in the database.
Question: 10
Which of the following Db2 catalog tables can be used to identify objects with
pending changes or recovery operations?
A. SYSIBM.SYSTABLESPACE
B. SYSIBM.SYSDATABASE
C. SYSIBM.SYSTABLES
D. SYSIBM.SYSCOPY
Answer: D
Explanation: The SYSIBM.SYSCOPY catalog table in Db2 for z/OS contains
information about the backup and recovery status of Db2 objects, including
table spaces, indexes, and databases. This information can be used to identify
objects with pending changes or recovery operations, which can be important
for maintaining the overall health and consistency of the Db2 environment.
Question: 11
What is the purpose of using a trusted context in Db2?
A. To Excellerate query performance
B. To enforce data integrity rules
C. To enable fine-grained access control
D. To automatically generate unique row IDs
Answer: C
Explanation: The primary purpose of using a trusted context in Db2 is to enable
fine-grained access control. A trusted context is a database object that defines a
relationship between a system user ID and a Db2 authorization ID, allowing for
more granular control over user privileges and access to the database.
Question: 12
Which utility control statement can be used to display information about any
active database-related threads on the Db2 subsystem?
A. DISPLAY UTILITY
B. DISPLAY THREAD
C. RECOVER SYSUTIL
D. START DB2
Answer: B
Explanation: The DISPLAY THREAD command can be used to display
information about any active database-related threads on the Db2 subsystem.
This can be useful in diagnosing and troubleshooting abnormal conditions that
may be related to specific database operations or threads.
Question: 13
Which Db2 utility can be used to update the statistics in the Db2 catalog tables?
A. CHECK DATA
B. CHECK INDEX
C. RUNSTATS
D. RECOVER
Answer: C
Explanation: The RUNSTATS utility in Db2 can be used to update the
statistics in the Db2 catalog tables. RUNSTATS collects and updates various
statistics about the data in your Db2 objects, including tables, indexes, and table
spaces. These statistics are then stored in the Db2 catalog tables, where they
can be used by the Db2 optimizer to make more informed decisions about
query execution plans. The other utilities mentioned (CHECK DATA, CHECK
INDEX, RECOVER) do not directly update the statistics in the Db2 catalog.
Question: 14
What is the purpose of the UTILITY status on a Db2 object?
A. To indicate that a system process is in progress on the object
B. To indicate that a utility process is in progress on the object
C. To indicate that a user-initiated action is in progress on the object
D. To indicate that the object is in a restricted state
Answer: B
Explanation: The UTILITY status indicates that a Db2 object has been placed
in a restricted state due to a utility process, such as a REORG or RECOVER
operation. This status prevents access to the object until the utility process is
complete.
Question: 15
What is the purpose of the AUDITPOLICYID parameter in the Db2 system
parameters?
A. To specify the name of the audit policy to be used
B. To define the audit trail storage location
C. To control the level of detail recorded in the audit trail
D. To set the default audit policy for new databases or objects
Answer: A
Explanation: The AUDITPOLICYID parameter in the Db2 system parameters
is used to specify the name of the audit policy that should be used for the Db2
system. This parameter allows you to activate a specific audit policy and ensure
that the desired events and objects are being audited.
Question: 16
Which Db2 encoding scheme is best suited for storing data that contains a mix
of different language characters, such as English, Chinese, and Arabic?
A. EBCDIC
B. ASCII
C. Unicode (UTF-8)
D. Unicode (UTF-16)
Answer: C
Explanation: The Unicode (UTF-8) encoding scheme is best suited for storing
data that contains a mix of different language characters, such as English,
Chinese, and Arabic. UTF-8 is a variable-length character encoding that can
represent a wide range of characters from different scripts and languages,
making it the preferred choice for handling multilingual data in a Db2 database.
Question: 17
Which of the following Db2 catalog tables is used to view the audit trace
records?
A. SYSIBM.SYSCOLUMNS
B. SYSIBM.SYSDATABASE
C. SYSIBM.SYSAUDITPOLITICS
D. SYSIBM.SYSAUDITPOLICIES
Answer: D
Explanation: The SYSIBM.SYSAUDITPOLICIES catalog table stores
information about the audit policies defined in the Db2 system, including the
events and objects being audited. This table can be queried to view the audit
trace records and analyze the audited activities.
Question: 18
Which Db2 privilege is required to create a user-defined function?
A. SYSADM
B. DBADM
C. CREATEUDF
D. GRANT
Answer: C
Explanation: The CREATEUDF privilege is required to create a user-defined
function in Db2. This privilege allows the user to create, alter, and drop user-
defined functions in the database.
Question: 19
What is the purpose of materialized views in the physical data model?
A. To Excellerate data integrity
B. To reduce data storage requirements
C. To Excellerate query performance
D. To simplify data maintenance
Answer: C
Explanation: The purpose of materialized views in the physical data model is to
improve query performance. Materialized views are pre-computed results of
complex queries, which can be used to speed up the execution of those queries
or similar ones, at the expense of some additional storage requirements.
Question: 20
Which SQL constructs are used to handle XML data in Db2 for z/OS?
A. XMLSERIALIZE, XMLVALIDATE, XMLEXISTS
B. XMLTABLE, XMLNAMESPACES, XMLCAST
C. XMLQUERY, XMLPARSE, XMLAGG
D. All other Options
Answer: D
Explanation: Db2 for z/OS provides several SQL constructs for handling XML
data, including:
XMLSERIALIZE, XMLVALIDATE, XMLEXISTS: These functions are used
to convert between XML and other data types, validate XML data, and check
for the existence of XML elements or attributes.
XMLTABLE, XMLNAMESPACES, XMLCAST: These constructs are used to
query and manipulate XML data stored in Db2 tables.
XMLQUERY, XMLPARSE, XMLAGG: These functions allow you to execute
XQuery expressions, parse XML data, and perform aggregations on XML data.
Question: 21
How can you enforce referential integrity between tables in Db2?
A. By defining a UNIQUE constraint on the parent table
B. By defining a CHECK constraint on the child table
C. By defining a FOREIGN KEY constraint on the child table
D. By defining a PRIMARY KEY constraint on the parent table
Answer: C
Explanation: To enforce referential integrity between tables in Db2, you need to
define a FOREIGN KEY constraint on the child table. This constraint specifies
a column or a set of columns in the child table that references the PRIMARY
KEY of the parent table. The FOREIGN KEY constraint ensures that the values
in the child table's column(s) match the values in the parent table's PRIMARY
KEY, maintaining the integrity of the relationship between the tables.
Question: 22
What is the purpose of the INCREMENTAL option in the COPY utility when
creating an incremental image copy?
A. To create a full image copy of the table space
B. To create an incremental image copy of the table space
C. To create a compressed image copy of the table space
D. To create a parallel copy of the table space
Answer: B
Explanation: The INCREMENTAL option in the COPY utility instructs Db2 to
create an incremental image copy of the table space, which captures only the
changes since the last full or incremental image copy.
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