6.3.1.1 Storage Classes

The following example Storage Classes can be used for online production table spaces:

• SCDBCRIT

6.3.1.2 Management Classes

The following example Management Class can be used for online production table spaces:

MCDB20

6.3.2Work Database

All DB2 subsystems use table spaces in a Work database. For example, the Work database stores an intermediate result of a query, or is the workarea for an internal sort of a result table. To avoid contention with DB2 environments requiring high performance, the table spaces in the Work database should not go to the Storage Group where the high performance table spaces are placed (SGFAST and SGCRIT).

The Work database only stores temporary data. If the Work database is lost, DB2 rebuilds its contents automatically on a restart, or manually with a START DATABASE command. This should be adequate for most production environments, no special availability requirements are necessary.

6.3.2.1 Storage Classes

The following example Storage Classes can be used for development and test table spaces:

• SCDBMED

6.3.2.2 Management Classes

The following example Management Class can be used for development and test table spaces:

• MCDB20

6.3.3 Summary

Table 18. DB2 System Database Requirements

Databases

Performance

Availability

Migration

Storage

 

 

 

 

Group

 

 

 

 

 

Catalog

Good

Very High

NO

SGDBCRIT

 

 

 

 

 

Directory

Good

Very High

NO

SGDBCRIT

 

 

 

 

 

Work

Good

Low

NO

SGDB20

 

 

 

 

 

Managing DB2 Databases with SMS 61

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IBM 5695-DF1, 5655-DB2 manual Directory Good Very High

5695-DF1, 5655-DB2 specifications

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