Which statement about the XML structure in DB2 is true?
- XML documents in DB2 are always stored as text
- XML documents in DB2 cannot be queried
- XML documents in DB2 cannot have attributes
- XML documents in DB2 follow a hierarchical structure
The true statement about the XML structure in DB2 is that XML documents follow a hierarchical structure. In DB2, XML documents are represented in a hierarchical format where elements are nested within each other to represent the relationships between different parts of the data. This hierarchical structure allows for the representation of complex data models and facilitates efficient querying and manipulation of XML data in DB2.
What is the main benefit of using data compression and encryption together in DB2?
- Enhanced storage efficiency and security
- Improved query performance
- Reduced backup time
- Simplified data management
The main benefit of using data compression and encryption together in DB2 is achieving enhanced storage efficiency and security simultaneously. By compressing data, storage space is optimized, leading to cost savings and improved performance. Additionally, encrypting compressed data ensures that sensitive information remains protected from unauthorized access, providing comprehensive data security measures. This combined approach strengthens data management practices, reduces operational complexities, and mitigates risks associated with data breaches or unauthorized access attempts.
The integration of Health Monitor with other DB2 features enhances ________.
- Backup and Recovery
- Data Security
- High Availability
- Performance Tuning
The integration of Health Monitor with other DB2 features enhances Performance Tuning by providing real-time monitoring and analysis of database performance metrics, allowing for proactive optimization efforts.
Which type of index in DB2 is commonly used for speeding up data retrieval operations?
- B-Tree Index
- Bitmap Index
- Clustered Index
- Hash Index
B-Tree indexes are commonly used in DB2 to speed up data retrieval operations. These indexes organize data in a balanced tree structure, enabling efficient search operations by navigating through levels of the tree to locate specific values.
Explain the concept of functional dependencies and their role in normalization.
- Functional dependencies define relationships between attributes
- Functional dependencies improve data integrity
- Functional dependencies increase data redundancy
- Functional dependencies reduce data redundancy
Functional dependencies define relationships between attributes, where the value of one attribute uniquely determines the value of another. They are pivotal in normalization as they help identify candidate keys and determine the level of normalization required.
Which component of DB2 is responsible for managing configuration settings?
- DB2 Control Center
- Database Catalog
- Database Configuration Files
- Database Manager Configuration
The Database Manager Configuration is the component of DB2 responsible for managing configuration settings. It includes parameters related to memory allocation, logging, and other aspects of the database.
How does DB2 handle updates to tables with indexes?
- DB2 handles updates to tables with indexes by first locking the index pages related to the affected rows, then updating the table data, and finally updating the index entries accordingly.
- DB2 manages updates to tables with indexes by temporarily disabling the indexes, performing the updates on the table, and then rebuilding the indexes.
- DB2 updates the indexes concurrently with the table updates, ensuring that the indexes remain synchronized with the table data.
- Updates to tables with indexes in DB2 are handled by maintaining consistency between the data in the table and the index.
DB2 employs a method of locking index pages during updates to ensure consistency between the table data and the index entries. This approach minimizes the risk of data inconsistencies and ensures that queries accessing the index return accurate results. Understanding how updates are managed in tables with indexes is crucial for optimizing performance and maintaining data integrity in DB2 environments.
Scenario: An application requires precise monetary values to be stored in the database. Which data type is most appropriate for this purpose in DB2?
- CHAR
- DECIMAL
- FLOAT
- INTEGER
DECIMAL data type is the most suitable for storing precise monetary values in a DB2 database. DECIMAL provides exact numeric representation without any rounding or approximation issues, making it ideal for financial calculations where precision is crucial.
The Communication Manager component in DB2's architecture ensures ________.
- Compatibility with different operating systems
- Data integrity and consistency across nodes
- Load balancing across multiple servers
- Secure communication between client and server
The Communication Manager in DB2's architecture is responsible for establishing and managing connections between client applications and the DB2 database server, ensuring secure and reliable communication, and facilitating data exchange while maintaining integrity and confidentiality.
In DB2, what is the purpose of using a cursor with a FOR UPDATE clause?
- To automatically commit the transaction
- To lock the rows fetched by the cursor for update operations
- To optimize query performance
- To retrieve data without locking any rows
Using a cursor with a FOR UPDATE clause in DB2 is intended to lock the rows fetched by the cursor. This ensures that the rows cannot be modified by other transactions until the current transaction completes. This feature is commonly used in scenarios where data consistency and integrity are crucial, such as in banking applications where multiple users may try to update the same data simultaneously.