SAP ABAP Data Dictionary Interview Questions and Anwers

What is Delivery Class?
You use the delivery class to control the transport of table data for an installation, upgrade, or client copy and transports between customer systems. The delivery class is also used in the extended table maintenance.

There are the following development classes:

●      A- Application table (master and transaction data).

●      C- Customer table, data is only maintained by the customer.

●      L- Table for storing temporary data.

●      G- Customer table, SAP can insert new data records but cannot overwrite or delete existing ones. The customer namespace must be defined in table TRESC. To define the customer namespace use report RDDKOR54. You can start it directly from the table maintenance by choosing Maintain Customer Namespace on the Delivery and Maintenance tab.

●      E- System table with its own namespace for customer entries. The customer namespace must be defined in table TRESC. To define the customer namespace use report RDDKOR54. You can start it directly from the table maintenance by choosing Maintain Customer Namespace on the Delivery and Maintenance tab.

●      S- System table, data changes have the status of program changes.

●      W- System table (for example table of the development environment) whose data is transported with its own transport objects (such as R3TR PROG, R3TR TABL and so on).

How many types of Data Classes are there in sap abap?

i) APPL0(Master Data) for the data frequently accessed but rarely updated/changed.
ii)APPL1(Transactional Data) for the data that is frequently changed.
iii)APPL2(organizational Data) for customizing data that is defined/ entered during system installation and rarely changed.

 What is Value Table? 
Value table is maintained at Domain level in SAP. During domain creation, value range of the domain i defined by specifying value table. 

What is Table Attribute? 
The Table attributes determine who is responsible for maintaining a table and which types of access are allowed for the table. The most important table attributes are:
i)Delivery class
ii)Table Maintenance allowed 
iii)Activation type.

What is is a Match code? 
A Match code is a tool tip to help us to search for the data records in the system. Match codes are an efficient and user friendly search where key of a record is unknown.
What is meant by Hot spots?
A Hot spot is a list area where the mouse pointer appears as an upright hand symbol. When a user points to that area, a single click does the same thing as a double click. Hot spots are supported from R/3 release 3.0. 

Difference between call by value and call by reference?
Call By Value:creates a new memory location for use within the subroutine. The memory is freed once it leaves the subroutine, changes made to the variable are not affected outside the subroutine.
Call by Reference : passes a pointer to the memory location. Changes to the variable within the subroutine affects the variable outside the subroutine.