Attach Facility Modernization Guide

Attach Facility enables batch applications to access DB2 data directly, without requiring execution within the TSO environment. It streamlines the interaction between batch processes and DB2 databases, potentially improving performance. This is achieved through the DB2 Call-Attach Facility (CAF).

Attach Facility is a middleware solution. It provides a bridge between batch applications and DB2 databases, facilitating data access and manipulation. It is not a standalone application but rather a system enhancement.

Organizations that rely heavily on batch processing for data warehousing, reporting, or ETL (Extract, Transform, Load) operations are prime candidates. These are often large enterprises in industries like banking, insurance, and retail that require efficient DB2 access from batch jobs.

Consider Attach Facility when batch jobs accessing DB2 are experiencing performance bottlenecks or when there is a need to reduce TSO overhead. It is also beneficial when aiming to simplify the architecture for batch/DB2 interactions.

Alternatives include other DB2 connectivity solutions and methods for optimizing batch job performance, such as tuning SQL queries, improving data access patterns, or using alternative data access methods. However, Attach Facility provides a direct connection without TSO.

Attach Facility operates on z/OS and is dependent on the DB2 subsystem. It leverages the DB2 Call-Attach Facility (CAF) to establish connections. It requires a properly configured DB2 environment.

Attach Facility requires a running DB2 subsystem on z/OS. It integrates directly with DB2's CAF to provide its functionality. The specific version of DB2 may have compatibility requirements.

Attach Facility enhances DB2's capabilities by providing a more direct connection for batch applications. It extends the functionality of DB2 by allowing batch jobs to access DB2 data without the overhead of TSO.

The core component is the Attach Facility module itself, which integrates with DB2's CAF. This module handles the communication between the batch application and the DB2 database.

Attach Facility improves batch/DB2 performance by enabling direct access to DB2 data, reducing the overhead associated with TSO. This can lead to faster processing times and reduced resource consumption.

By optimizing batch/DB2 interactions, Attach Facility can reduce the overall cost of processing large volumes of data. This includes savings in CPU usage, elapsed time, and potentially software licensing costs.

Attach Facility simplifies the architecture for batch applications accessing DB2 data. By eliminating the need for TSO, it reduces complexity and can make the system easier to manage and maintain.

Attach Facility leverages DB2's security mechanisms for authentication and authorization. It relies on DB2's access control model to ensure that batch applications only access data they are authorized to view or modify.

Access to DB2 data through Attach Facility is controlled by DB2's standard authorization mechanisms. This includes grants and revokes on tables, views, and other DB2 objects.

Attach Facility integrates with DB2's audit logging capabilities. All data access and modification activities performed through Attach Facility can be logged and audited using DB2's standard audit trails.

Implementing Attach Facility requires technical expertise in both z/OS and DB2. This includes understanding DB2's CAF, configuring the Attach Facility module, and ensuring compatibility with existing batch applications.

Ongoing operational requirements include monitoring the performance of batch jobs using Attach Facility, maintaining the Attach Facility module, and ensuring compatibility with DB2 upgrades.

Common implementation challenges include ensuring compatibility with existing batch applications, properly configuring DB2's CAF, and resolving any performance issues that may arise.