Views in DB2 enable users to retrieve data from one or more tables in a structured manner without directly accessing the underlying tables. This abstraction simplifies querying and enhances security. 

DB2 integrates with other technologies through specialized connectors. These connectors provide seamless interaction between DB2 and various systems such as ERP, CRM, and other databases, ensuring smooth data flow. 

Different versions of DB2 introduce new features and enhancements that may affect the compatibility of existing applications. For instance, upgrading to a newer version may offer improved performance optimizations, but it could also require modifications to existing code to leverage new features effectively. Therefore, understanding the impact of version upgrades on application compatibility is essential for ensuring a smooth transition and optimal performance. 

DB2 is a robust relational database management system (RDBMS) known for its support across various platforms, including mainframes, distributed systems, and cloud. It offers advanced features like high availability, disaster recovery, and security mechanisms to protect data integrity and confidentiality. 

In DB2, a cursor is primarily used to process result sets. Cursors allow fetching and processing individual rows from a result set returned by a SQL query. They enable iterative processing of query results, facilitating row-by-row operations within application programs. 

DB2 offers automatic database tuning features that analyze database performance and automatically adjust configuration parameters to optimize performance. This helps in identifying and resolving performance bottlenecks without manual intervention, improving overall efficiency. 

Auditing in DB2 involves tracking and logging database activity to monitor user actions, changes to data, and system events. This process helps in identifying security breaches, detecting unauthorized access, and ensuring compliance with regulatory requirements. By recording database activities, auditing provides a comprehensive trail of actions performed within the database, facilitating forensic analysis and investigation in case of security incidents. It plays a crucial role in ensuring the integrity, confidentiality, and availability of data in DB2 environments. 

Partitioning a table in DB2 can enhance database scalability. By partitioning a large table into smaller, manageable partitions, DB2 can distribute data storage and processing across multiple servers, improving overall system scalability. 

Besides IBM Data Studio, developers and administrators may opt for specialized IDEs designed explicitly for DB2 development tasks. These specialized IDEs often offer advanced features and integrations tailored specifically for working with DB2 databases, providing enhanced productivity and efficiency. While IBM Data Studio offers a comprehensive solution, specialized IDEs may offer additional functionalities catering to specific needs or preferences, allowing users to choose the toolset that best fits their requirements and preferences. 

The FOREIGN KEY constraint in DB2 enforces referential integrity between tables by ensuring that values in a column (or combination of columns) in one table exist as values in another table's referenced column (typically the primary key).