7.2 BSDS

The bootstrap data set (BSDS) contains the information required by DB2 to start the subsystem in normal circumstances. It also handles the restart and recovery in any abnormal circumstance. For example, all log data sets (active and archive) are automatically registered within the BSDS.

Data Organization

The BSDS is a VSAM KSDS. The data control interval is 4 KB; the index control interval is 1 KB. Figure 19 on page 67 shows an example VSAM definition of a BSDS.

Performance

While DB2 is executing, the BSDS is updated periodically. The frequency of these updates is not high, but is dependent on general DB2 subsystem activity. For example, the BSDS is updated at every DB2 checkpoint and at every archive process.

Availability

The BSDS is a critical resource for DB2. Because of this, DB2 has implemented dual copies for the BSDS. DB2 requires the presence of two copies of the BSDS during restart, to ensure high availability. While DB2 is running, a BSDS may fail and DB2 continues operating with one BSDS. The second BSDS should be restored as soon as possible, to avoid DB2 shutdown, which would occur if the last available BSDS also fails.

DEFINE CLUSTER

-

( NAME(DB2V610Z.BSDS01)

-

VOLUMES(SBOX10)

-

REUSE

-

SHAREOPTIONS(2 3) )

-

DATA

-

( NAME(DB2V610Z.BSDS01.DATA)

-

RECORDS(180 20)

-

RECORDSIZE(4089 4089)

-

CONTROLINTERVALSIZE(4096)

-

FREESPACE(0 20)

-

KEYS(4 0) )

-

INDEX

-

( NAME(DB2V610Z.BSDS01.INDEX)

-

RECORDS(5 5)

-

CONTROLINTERVALSIZE(1024) )

 

Figure 19. Example VSAM Definition of one BSDS

7.2.1 Storage Class

BSDSs use a Storage Class with guaranteed space. This allows the DB2 administrator to decide the location of each BSDS.

SCDBACTL

7.2.2Management Class

No SMS management is required for the BSDS data sets. The following

Management Class has been defined for this purpose.

• MCDBACTL

Managing DB2 Recovery Data Sets with SMS 67

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IBM 5695-DF1, 5655-DB2 manual Bsds, Data Organization, Performance, Availability

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.

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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.