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What is a Data Class and Size Category?

Updated May 18, 2018

What is a Data Class?

The Data class determines in which tablespace the table is stored when it is created in the database.

What is a Size Category?

The Size category describes the probable space requirement of the table in the database. How Many types of size categories and data classes are there? There are five size categories (0-4) and 11 data classes, only three of which are appropriate for application tables:

- APPL0 - Master data (data frequently accessed but rarely updated)
- APPL1 - Transaction data (data that is changed frequnetly)
- APPL2 - Organisational data (customizing data that is entered when system is configured and then rarely changed)