Append structure
An append structure defines a set of fields which belong to another table
or structure but which are treated in the correction administration as
its own object.
Append structures are used to support modifications.
Pooled table
Pooled tables can be used to store control data (e.g. screen sequences,
program parameters or temporary data). Several pooled tables can be
combined to form a table pool. The table pool corresponds to a physical
table on the database in which all the records of the allocated pooled
tables are stored.
Cluster table
Cluster tables contain continuous text, for example, documentation.
Several cluster tables can be combined to form a table cluster. Several
logical lines of different tables are combined to form a physical record
in this table type. This permits object-by-object storage or
object-by-object access. In order to combine tables in clusters, at least
parts of the keys must agree. Several cluster tables are stored in one
corresponding table on the database.
Generated view structure
In activation a structure is generated for a view. This structure serves
as interface for the runtime environment. It does not generally appear in
the ABAP/4 Dictionary.
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)
What are control tables?
The values specified for the size category and data class are mapped to
database-specific values via control tables.
What is the function of the transport system and workbench organiser?
The function of the transport system and the Workbench Organizer is to
manage any changes made to objects of the ABAP/4 Development Workbench
and to transport these changes between different SAP systems
