Describe data classes.

 data classes.

•  Master data: It is the data which is seldom changed. Transaction data: It is the data which is often changed. Organization data: It is a customizing data which isentered in the system when the system is configured and is then rarely changed. System data: It is the data which R/3 system needs for itself.

If you choose the data class correctly, your table is automatically assigned to the correct area (tablespace or DBspace) of the database when it is created. Each data class corresponds to a physical area in which all the tables assigned to this data class are stored. There are the following data classes:

• APPL0 (master data): Data which is seldomly changed. An example of master data is the data contained in an address file, such as the name, address and telephone number.
• APPL1 (transaction data): Data that is frequently changed. An example of transaction data is the goods in a warehouse, which change after each purchase order.
• APPL2 (organizational data): Customizing data that is defined when the system is installed and seldomly changed. An example is the table with country codes.

Two further data classes, USR and USR1, are provided for the customer. These are for user developments. The tables assigned to these data classes are stored in a tablespace for user developments.

Confused? Feel free to ask

Your feedback is always appreciated.I will try to reply Ur queries as soon as time allows.
Regards,
SAPhelpdesk