In DB2, what does a view represent?
- Index table
- Physical table
- Temporary table
- Virtual table
In DB2, a view represents a virtual table that does not store data physically but rather provides a logical representation of data stored in one or more underlying tables. Queries against views are processed by fetching data from the underlying tables based on the view's definition.
Which IDE is commonly used for developing and managing DB2 databases alongside IBM Data Studio?
- Eclipse
- IntelliJ IDEA
- NetBeans
- Visual Studio Code
Eclipse is commonly used alongside IBM Data Studio for developing and managing DB2 databases. IBM Data Studio is built on top of the Eclipse platform, providing a seamless integration of development tools specifically tailored for working with DB2 databases.
Which SQL statement is used to create a user-defined function in DB2?
- CREATE FUNCTION
- CREATE INDEX
- CREATE TABLE
- CREATE VIEW
The SQL statement used to create a user-defined function in DB2 is "CREATE FUNCTION". This statement allows developers to define custom functions tailored to specific requirements.
Which factor does DB2 use for data distribution in partitioning?
- Foreign Key
- Hash Key
- Index Key
- Primary Key
DB2 primarily uses a hash key for data distribution in partitioning. This involves hashing the data using a hash function and distributing it across partitions based on the result of the hash function.
DB2 provides built-in functions for querying and manipulating ________ data.
- JSON
- Relational
- Semi-structured
- XML
DB2 provides built-in functions specifically designed for querying and manipulating semi-structured data types such as XML and JSON. These functions enable developers to perform various operations on semi-structured data stored in DB2 databases, such as extracting values, navigating hierarchical structures, and transforming data formats.
In normalization, what is the primary objective?
- To maximize database storage efficiency
- To minimize redundancy
- To optimize query performance
- To simplify database structure
The primary objective of normalization in DB2 is to minimize redundancy by organizing data efficiently. Reducing redundancy helps improve data integrity, save storage space, and ensure consistency in the database.
The DB2 Command Line Processor (CLP) offers ________ capabilities for executing SQL commands and scripts.
- Batch
- Distributed
- Graphical
- Interactive
The DB2 Command Line Processor (CLP) offers batch capabilities for executing SQL commands and scripts. It allows users to run SQL commands and scripts in batch mode, enabling automation and efficient execution of tasks without the need for manual intervention.
What is the difference between the MAX() and MIN() functions in DB2?
- MAX() function can be used only on indexed columns, whereas MIN() function can be used on any column.
- MAX() function ignores NULL values, whereas MIN() function treats NULL values as the lowest possible value.
- MAX() function is used for text data types, whereas MIN() function is used for numeric data types.
- MAX() function returns the maximum value from a column, while MIN() function returns the minimum value from a column.
The MAX() function retrieves the largest value from a specified column in a table. On the other hand, the MIN() function retrieves the smallest value from a specified column. Both functions are aggregate functions commonly used in SQL queries to perform calculations on sets of values. The key difference lies in the values they retrieve based on the specified column.
In DB2, what is clustering used for?
- Ensuring data integrity
- Grouping related rows together
- Improving database security
- Optimizing query performance
Clustering in DB2 is primarily used for optimizing query performance. It involves physically storing related rows together on disk to minimize disk I/O operations and improve the efficiency of data retrieval during queries.
In DB2, what is the purpose of attributes within tags?
- To define the structure of the XML document
- To determine the color and style of the tags
- To provide additional information about the data contained within the tags
- To specify the encoding format of the XML document
Attributes within tags in DB2 serve the purpose of providing additional information about the data contained within the tags. This could include metadata such as data types, lengths, or any other relevant details about the data being represented. These attributes enhance the clarity and context of the data within the XML document.