IBM Interview Questions, Process, and Tips for Freshers

Session method and call transaction are two different ways of executing SAP transactions.

• Session method executes a transaction in the same session as the calling program.

• Call transaction executes a transaction in a separate session.

• Session method is faster and more efficient as it does not require opening a new session.

• Call transaction is useful when the transaction being executed has its own set of screens and require...read more

Field symbol is a pointer to a field in ABAP.

• Field symbol is used to access data dynamically.

• It can be used to avoid copying large amounts of data.

• It can be used to access data in internal tables and structures.

• Example: ASSIGN statement assigns a field symbol to a field.

• Example: LOOP AT statement uses a field symbol to access data in internal tables.

Implicit and explicit enhancements in SAP ABAP

• Implicit enhancements are modifications made to standard SAP code without changing the original code

• Explicit enhancements are modifications made to standard SAP code by adding new code to the original code

• Implicit enhancements are done using function modules, while explicit enhancements are done using enhancement points

• Implicit enhancements are not visible in the standard S...read more

To trigger an RFC, use the function module 'RFC_FUNCTION_CALL'.

• Provide the RFC name and input parameters in the 'RFC_FUNCTION_CALL' function module.

• Use the 'DESTINATION' parameter to specify the target system.

• Call the function module using 'CALL FUNCTION'.

An interface is a contract between two systems or components that defines the methods and parameters that they will use to communicate with each other.

• Interfaces allow for loose coupling between systems or components

• They define a set of rules for communication

• Interfaces can be used in programming languages like Java and C#

• Examples of interfaces include JDBC for database connectivity and SOAP for web services

An abstract class is a class that cannot be instantiated and is used as a base class for other classes.

• An abstract class can have abstract methods that must be implemented by its subclasses.

• Abstract classes can have non-abstract methods and properties.

• An abstract class can be used to define a common interface for a group of related classes.

• Example: 'Animal' can be an abstract class with abstract methods like 'eat' and ...read more

Singleton pattern is a design pattern that restricts the instantiation of a class to one object.

• Singleton pattern ensures that only one instance of a class is created and provides a global point of access to it.

• It is useful when exactly one object is needed to coordinate actions across the system.

• In ABAP, singleton pattern can be implemented using static attributes and methods.

• Example: class CL_SING_ABAP implementing s...read more

Multiple inheritance allows a class to inherit from multiple superclasses in OO ABAP.

• Multiple inheritance can be achieved using interfaces.

• A class can implement multiple interfaces.

• A class can inherit from one superclass and implement multiple interfaces.

• Example: Class ZCL_MYCLASS extends ZCL_SUPERCLASS implements ZIF_INTERFACE1, ZIF_INTERFACE2.

• Diamond problem can occur in multiple inheritance.

• To avoid diamond problem,...read more

Badis can be found using transaction code SE18. User exits are older and customer exits are newer enhancements in SAP.

• Badis can be found using transaction code SE18.

• User exits are older enhancements in SAP.

• Customer exits are newer enhancements in SAP.

• Badis provide a more flexible and object-oriented approach compared to user exits and customer exits.

• Badis can be implemented multiple times, while user exits and customer...read more

To enhance a standard table in SAP ABAP, use append structures or custom fields.

• Create an append structure to add fields to the standard table without modifying it directly.

• Use custom fields to add new fields to the table.

• Enhance the table using the Enhancement Framework.

• Use BAdIs (Business Add-Ins) to add custom logic to the standard table.

• Examples: Append structure for MARA table to add custom fields for material mas...read more

Network topologies refer to the arrangement of various elements in a network.

• There are several types of network topologies, including bus, star, ring, mesh, and hybrid.

• Bus topology involves connecting all devices to a single cable.

• Star topology involves connecting all devices to a central hub or switch.

• Ring topology involves connecting devices in a circular manner.

• Mesh topology involves connecting devices to each other...read more