database name, and the table space name in Figure 2 on page 14 must match the definitions on Figure 3 on page 15.

CREATE TABLESPACE PAOLOR1 IN DSN8D61A

BUFFERPOOL BP0

CLOSE NO

USING VCAT DB2V610Z;

Figure 3. User Defined Table Space: Step 2— Define the Table Space

3.4 DB2 System Table Spaces

DB2 uses four internally defined databases to control and manage itself and the application data. The databases are:

•The Catalog database

•The Directory database

•The Work database

•The Default database

This section provides a general description of these databases.

Two tables, SYSIBM.SYSCOPY, belonging to the DB2 catalog, and SYSIBM.SYSLGRNX, belonging to the DB2 directory, are directly used by DB2 to manage backup and recovery; they are also described in this section.

3.4.1 The DB2 Catalog and Directory

The Catalog database is named DSNDB06. The Directory database is named DSNDB01. Both databases contain DB2 system tables. DB2 system tables store data definitions, security information, data statistics and recovery information for the DB2 system. The DB2 system tables reside in DB2 system table spaces.

The DB2 system table spaces are allocated when a DB2 system is first created, that is, during the installation process. DB2 provides the IDCAMS statements required to allocate these data sets as VSAM LDSs. The size of these LDSs is calculated from user parameters specified on DB2 installation panels. Figure 4 on page 16 shows panel DSNTIPD with default values for sizing DB2 system table spaces. In this figure, parameters numbered 1 to 12 are used to size DB2 catalog and directory table spaces.

3.4.2 The Work Database

In a non-data sharing environment, the Work database is called DSNDB07. In a data sharing environment, the name is chosen by the user. The Work database is used by DB2 to resolve SQL queries that require temporary work space. For example, SQL statements containing JOIN, ORDER BY, GROUP BY, may require space in the Work database, but this depends on available storage for the DB2 internal sort and the access path chosen by the DB2 optimizer.

Multiple table spaces can be created for the Work database. These table spaces follow the normal rules for creating a table space. At least two table spaces should be created, one with a 4K page size, and the other one with a 32K page size. DB2 V6 supports page sizes of 8K and 16K for table spaces, but not for the

DB2 Storage Objects 15

Page 36 Page 38
Page 37
Image 37
IBM 5695-DF1, 5655-DB2 manual DB2 System Table Spaces, DB2 Catalog and Directory, Work Database
Page 36 Page 38

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.
Top Page Image Contents