DFSMShsm's automatic backup services, supported by concurrent copy, to help with point of consistency backups.

It is not advisable to use HSM to manage most production databases. Therefore, use a NOMIGRATE Management Class for this type of data. This prevents HSM space and availability management from operating. Specifically, AUTO BACKUP is set to NO so that HSM does not back up the data set, ADMIN OR USER COMMAND BACKUP is set to NONE to prevent manual backup, and expiration attributes are set to NOLIMIT to prevent data set deletion.

Although production database data does receive automatic backup service, DFSMSdss can be set to run concurrent copy for production databases. ACCESSIBILITYmay be set to CONTINUOUS for Storage Classes assigned to production databases to ensure that the data set is allocated behind a storage control with concurrent copy support.

Testing or end user databases that have less critical availability requirements can benefit from system management using HSM. Additionally, selected data types for production systems could also be effectively managed using HSM.

For DB2 systems, it is possible to manage archive logs and image copies with HSM. These data sets can be retained on primary devices for a short period of time, and then migrated directly to tape (ML2).

HSM uses the same ML2 tape until it is full. Therefore, unless another mechanism is used, to avoid placing consecutive archive logs on the same ML2 tape, ensure that the storage administrator defines the HSM parameter SETSYS(PARTIALTAPE(MARKFULL), so it uses a new ML2 tape each time space management is executed.

Requirements should be agreed upon by the storage administrator and the DBA. Table 10 on page 42 displays a list of attributes for consideration.

Table 10. Management Class Attributes

ATTRIBUTE

COMMENT

 

 

Space management

- Release unused space in the data set (applies to

 

non-VSAM only).

 

 

Expiration

- Delete data set after a number of days or a date.

 

- Delete after a number of days of non usage.

 

- Use of Retention or Expiration periods.

 

 

Migration

- What method a data set can migrate (Command

 

or automatically, or both).

 

- Number of days non-usage on level 0 volumes

 

before migration commences.

 

- Number of days non-usage on level 1 volumes

 

before migration commences.

 

 

42Storage Management with DB2 for OS/390

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IBM 5655-DB2, 5695-DF1 manual Management Class Attributes
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5695-DF1, 5655-DB2 specifications

IBM 5655-DB2 and 5695-DF1 are significant components within the IBM software ecosystem, predominantly focusing on data management and integration solutions. These offerings cater primarily to enterprise environments that require robust database management systems and associated frameworks to maintain and manipulate data efficiently.

IBM 5655-DB2 is a well-known relational database management system (RDBMS) that excels in managing large volumes of structured data. Its architecture is designed to support high availability, scalability, and performance, crucial for businesses operating in today’s data-driven world. Some of its main features include advanced indexing capabilities, support for complex queries, and dynamic workload management. Additionally, it provides strong concurrency controls, which enable multiple users to access and manipulate data simultaneously without compromising data integrity.

One of the key characteristics of DB2 is its support for various data types, including JSON and XML, making it versatile for modern applications that generate data in diverse formats. It also features robust security mechanisms to protect sensitive data, aligning with compliance standards across industries. Integration with analytics tools further allows businesses to derive insights from their data, enhancing decision-making processes.

On the other hand, IBM 5695-DF1, also known as the InfoSphere DataStage, is a powerful data integration tool that facilitates the extraction, transformation, and loading (ETL) of data from various sources to target systems. It empowers organizations to streamline their data flows, ensuring that clean, consistent information is available for analysis and operational use. Key features of 5695-DF1 include a user-friendly graphical interface that enhances developer productivity and a rich set of connectors for numerous data sources, enabling seamless data integration.

DataStage also supports real-time data integration, allowing businesses to keep their data synchronized across multiple platforms. Its parallel processing capabilities dedicatedly optimize performance, enabling organizations to handle vast datasets efficiently. It incorporates data quality tools that help in validating and cleansing data before it is used for decision-making processes.

Both IBM 5655-DB2 and 5695-DF1 are part of a broader strategy to accommodate the evolving landscape of data management. Businesses leverage these technologies to enhance their data architectures, fostering agility and competitive advantage in their respective markets. Their integration capabilities, along with a focus on security and scalability, position them as vital assets in modern enterprise environments. Whether managing critical data within a database or ensuring seamless data flow across systems, these IBM offerings provide a comprehensive approach to handling complex data challenges.
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