Abap-3

What are the types of Update requests ?
- An update request can be divided into one primary (V1) and several Secondary update components (V2). Time-critical operations are placed in V1 component and those whose timing are less critical are placed in V2 components. If a V1 update fails, V2 components will not be processed.

What are the roll and page areas ?
- Roll and page areas are SAP R/3 buffers used to store
user contexts ( process requests ) . The SAP dispatcher assigns
process requests to work processes as they are received. If
the work process is unavailable the process requests are queued in the roll and page areas.
Paging area holds data from the application programs.
Roll area holds data from previous dialog steps and data that characterizes user.

What is a Spool request ?
- Spool requests are generated during dialog or background processing and placed in the spool database with information about the printer and print format. The actual data is placed in the Tem Se (Temporary Sequential objects).

What are the different database integrities ?
- Semantic integrity
- Relational integrity
- Primary key integrity
- Value set integrity
- Foreign key integrity and
- Operational integrity.


DATA DICTIONARY .

Type of a table or structure

The table type determines how the logical table description defined in
the ABAP/4 Dictionary is reproduced on the database.

There are the following table types:
o transparent table
o structure
o append structure

For internal purposes, such as storing control data or update texts,
there are in addition the following table types:
o pooled table
o cluster table
o generated view structure

Transparent table

There is a physical table on the database for each transparent table. The
names of the physical tables and the logical table definition in the
ABAP/4 Dictionary correspond.

All business data and application data are stored in transparent tables.

Structure

No data records exist in the database for a structure. Structures are
used for the interface definition between programs or between screens and
programs.