C1000-078 Dumps
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IBM Db2 12 for z/OS Administrator
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Which of the following statements is true about Db2 for z/OS data sharing?
Data sharing allows multiple Db2 subsystems to share a single database.
Data sharing enhances data security by encrypting all database communication.
essing.
ata sharing enables the replication of data across multiple Db2 databa wer: A
anation: Data sharing in Db2 for z/OS enables multiple Db2 subsyste a single database. It allows for parallel execution of transactions acro ubsystems, ensuring high availability, scalability, and workload balan subsystem maintains its own buffer pools and lock structures but sha ame database objects, providing a shared and consistent view of the d ss the subsystems.
ch of the following indexing techniques is most suitable for improving performance in situations where the data is frequently updated?
lustered index
Data sharing improves query performance by utilizing distributed proc
D ses.
Ans
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share ss
the s cing.
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Whi query
C
Non-clustered index
Bitmap index
Partitioned index Answer: B
Explanation: A non-clustered index is more suitable for situations where the
data is frequently updated. Unlike a clustered index, which physically orders the data on disk based on the index key, a non-clustered index creates a separate structure that references the data. This separation allows for better performance during data modifications, as updates do not require reordering of the entire data set.
ch of the following authentication methods provides the highest level o rity in IBM Db2 for z/OS?
ser ID and password authentication
ightweight Directory Access Protocol (LDAP) authentication erberos authentication
ertificate-based authentication wer: D
anation: Certificate-based authentication involves the use of digital ficates to verify the identity of users. It provides a higher level of secu pared to user ID and password authentication, LDAP authentication, o eros authentication. With certificate-based authentication, users must ess a valid certificate, which is issued by a trusted certificate authority ss the Db2 database.
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C
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Kerb
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During the installation of IBM Db2 for z/OS, which component is responsible for creating and managing the database catalog?
Db2 installation panel
Db2 Data Sharing Group (DSG)
Db2 Catalog System (DCS)
Db2 Initialization Parameters (DIP) Answer: C
ystem to locate and access the database objects.
is the purpose of a recovery log in IBM Db2 for z/OS?
keeps track of all database modifications for auditing purposes. provides a backup of the entire database for disaster recovery. records all changes made to the database for transaction recovery. stores historical data for analytical reporting.
wer: C
anation: The recovery log, also known as the transaction log, is a cruc ponent of database recovery in Db2. It maintains a record of all fications made to the database, such as inserts, updates, and deletes. I
of a system failure, the recovery log is used to restore the database t istent state by applying the logged changes to the database.
Explanation: The Db2 Catalog System (DCS) is responsible for creating and managing the database catalog during the installation of Db2 for z/OS. The catalog contains metadata about the database objects, such as tables, indexes, and views. It is a crucial component for the functioning of Db2 and is used by the s
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Ans
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Which Db2 feature enables the integration of a distributed DBMS with IBM Db2 for z/OS?
Data Propagation
Distributed Relational Database Architecture (DRDA)
Data Sharing
Db2 Connect Answer: B
ommunication and data exchange between different database systems. DA allows applications on distributed systems to access and manipulat n Db2 for z/OS seamlessly, facilitating distributed access and data
ng.
ch of the following statements is true about database normalization? reduces data redundancy and improves data integrity.
improves query performance and reduces disk space usage. simplifies data access and improves data availability. increases data concurrency and reduces data locking.
wer: A
anation: Database normalization is a process that organizes data in a base to eliminate redundancy and improve data integrity. By breaking
Explanation: DRDA is a network architecture that enables the integration of a distributed DBMS with IBM Db2 for z/OS. It provides a standardized protocol for c
DR e
data i shari
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It
It
It
It
Ans Expl
data
down data into smaller, logical units, normalization reduces data duplication, enhances data consistency, and minimizes the risk of data anomalies.
In IBM Db2 for z/OS, which utility is used to load large amounts of data efficiently into a table?
LOAD utility
IMPORT utility
REORG utility
anation: The LOAD utility in Db2 for z/OS is specifically designed to amounts of data efficiently into a table. It provides high-speed data ng capabilities and supports various input formats, such as delimited f
ential files, and binary files. The LOAD utility is optimized for bulk d ng and is often used during initial data population or when a significa unt of data needs to be loaded.
ch of the following statements accurately describes the purpose of a rialized query table (MQT) in IBM Db2 for z/OS?
provides a temporary storage area for intermediate query results. allows for the distribution of data across multiple database partitions. caches frequently accessed query results to improve query performan enables real-time replication of data between Db2 databases.
wer: C
COPY utility Answer: A
Expl load
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Ans
Explanation: A materialized query table (MQT) in Db2 is used to cache frequently accessed query results. By storing the query results in a physical table, Db2 can avoid executing the query repeatedly, thus improving query performance. The data in an MQT is refreshed periodically based on defined refresh criteria, ensuring that the cached results remain up to date.