SAP Basis Interview Questions

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Q.What is SAP Basis? 
SAP basis acts as an operating system or a platform for SAP applications to run.  It supports the entire range of SAP applications.

Q.What is the difference between Developer Trace, System Log and System Trace?
System Trace:
When you want to record internal SAP system activities, system trace is used. The trace is useful in diagnosis internal problems within SAP system and the host system.
System Log : To know the recent logs for application server and CI,  System log is referred.
Developer Trace: In the event of problems, developer trace, records the technical information about the error or problem
For problem analysis and system monitoring Developer trace or System log is used.

Q.In a situation where My SAP system is down (Users unable to login to SAP system), how to analyze the problem?
Check the Database status
SAP services
SAP management console ( Dispatcher, IGS and Message Server)
You need to find out trace root on the basis of point at serial no ( c ).
Check network connectivity if everything is ok

Q.What is private mode?
In private mode, the heap data is exclusively allocated by the user and is no more shared or available across the system. This occurs when your extended memory is exhausted.

Q.What is OSP$ mean?
Two users “OPS$adm” and “OPS$SAP” Service are created in your SAP system and to connect and communicate with database internally this user mechanism is used. 

Q.What are the different types of RFC and explain what Transactional RFC is?
RFC (Remote Function Call) is a mechanism to communicate and exchanging the information between other SAP systems.  There are four types of RFC’s system
Synchronous RFC ( S RFC)
Asynchronous RFC (A RFC)
Transactional RFC ( T RFC)
Queued RFC (Q RFC)
Transactional RFC ( T RFC ) :  This type of RFC is similar to asynchronous RFC, but by allocating a transaction ID (TID) it makes sure that the request sent multiple times due to an error must process only for once.  In T RFC the remote system does not have to be available at the moment unlike asynchronous RFC.

Q.What is OCM and how to apply OCM Patches?
OCM stands for online correction system, by using SPAM you can apply OCM Patches.

Q.How to perform a SAP-export and import tables in SAP from OS level?
To export or import tables in SAP from OS level you have to follow three steps and by using R3trans utility in SAP
Step 1: Collect all list of tables to be exported
Step 2: Check whether enough disk space is available in the directory where you going to export.
Step 3: Create two control files for R3trans which will be used for import and export.

Q.What is the difference between – support package, kernel and SAP note?
SAP Note:
An error in a single transaction or program is removed by implementing a SAP note.
Kernel: Kernel contains the executable files (.EXE) like other applications and when a Kernel upgrade is done a new version of the EXE file replaces the older versions.
Support Package: SAP support packages is a bunch of corrections, this can be used by applying transaction SPAM

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Q.How can you find the list of objects that have been repaired in the system?
The list of objects that have been repaired can be found in the system having ADIRACCESS keys.

Q.What is the purpose of table TADIR?
Table TADIR contains object directory entries.

Q.Is it possible to install SAP patches when other users are online?
When other users are online we can’t install SAP patches, as support manager will not be able to update and it will terminate it. So it is always feasible to better apply support packs when there is no users login into the system.

Q.Mention what is the difference between SDM and JSPM?
JSPM ( Java Support Package Manager) is used to apply support packages on deployed software components.  In other words it’s a tool that allows you to install the components and support packages.
SDM ( Software Delivery Manager) is used for importing Java Support Packages.  To deploy and manage software packages received from SAP,  SDM tool is used.
JSPM uses SDM for the deployment purpose

Q.What is the procedure to disable import all option from STMS in SAP?
To disable import all option from STMS in SAP, steps are:
Go to STMS T-code
Go to menu option overview
Select System
Choose SAP System
Go to transport tool tab
Create parameter “No_Import_All” with value set as 1
Save it

Q.Mention the use of personalized tab and parameter tab in user master record?
Parameter Tab:
It will allow access to assign T-code on which one has to work
Personalization Tab: It is required for RFC connection between systems other than user personal information

Q.What is the different type of users in SAP?
Different types of users in SAP are
Dialog Users
System Users
Communication Users
Service Users
Reference Users

Q.Explain what is the use of reference and service user in SAP?
Service User:
 For “service user” initial password or expiration of password are not checked.  Only admin has rights to change the password, users cannot. Multiple logins are possible.
Usage: Service users are for anonymous users.  Minimum authorization should be given to such type of users
Reference User: For this kind of users GUI login is not possible.
Usage: In case of emergency, with the help of reference user,  it is possible to provide one user authorization to another user.

Q.Explain how you can restrict multiple logins of user in SAP? What are the thing you have to take care of while writing the ID’s?
To restrict multiple logins you have to set the parameter as
Parameter should set in RZ10
login/multi_login_users= set to 1 to activate (If this parameter is set to value 1, multiple dialog logons to the R/3 system are blocked)
login/disable_multi_gui_login=  List out the users that should be allow to logon for multiple times
While writing the user ID’s things to be taken care are, list the user IDs separated by commas “..” , between user IDs do not leave space characters and to see the changes restart the R/3 instance.  

Q.At OS level how you can change the number of work process? How you can analyze the status of work process at OS level?
To change the number of work process at the OS level, you can increase the no. of work processes by modifying the parameter rdisp/wp_no_=
Status of a WP at OS level can be checked by executing dpmon.

Q.Explain how to define logon groups?
Logon groups can be defined using the Tcode smlg. In order to do that you have to create the group and then assign the instances for that particular group.

Q.What is SAP single stack system?
A single stack system is defined by SAP system either with JAVA as runtime engine or SAP Netweaver as ABAP.
Eg: Single Stack System (Java) is SAP Enterprise Portal System (Ep)
  Single Stack System (ABAP) is SAP ERP (ECC)

Q.What are the tools to install JAVA patches?
To use the JAVA patches , SAP installer (SAPinst.exe) is employed.  SDM and JSPM are the latest versions of tools used to deploy Java Patches.

Q.Explain what is “Data Sets” in SAP?
To solve queries which cannot be solved by using the method interfaces, a set of information is used. This set of information is known as “ Data Sets”.

Q.At O.S level where to check for system logs of SAP application?
To check the system logs of SAP application at OS level, SAPMMCà SAP systemsà SIDàSysLog

Q.Explain what is LUW (logical unit of work)?
A list of steps among t-code in known as logical LUW

Q.Explain what is heterogenous system copy and homogenous system copy ?
Homogenous system copy= Same OS + Same Database
Heterogeneous system copy= Different OS + Different database or same database

Q.Explain what are the functional modules used in sequence in BDC?
Using BDC programming a data can be transferred successfully.  There are 3 functional modules which can be used in a sequence.
BDC _OPEN_GROUP:  Name of the client, sessions and user name are specified in these functional modules.
BDC_INSERT: It is used to insert the data for one transaction into a session.
BDC_CLOSE_GROUP: It is used to close the batch input session.

Q.Explain what is an “OK” code is and what is the difference between “t-code” and “OK” code?
An “OK” code is used by a program to execute a function for example after a push button has been clicked.
Transaction code or “t-code” is a “shortcut” that helps a user to run a program.

Q.Explain how client refresh is different than client copy?
Client refresh is overwriting or copying to existing client, while copying the newly created client is called client copy.

Q.What is a background processing batch scheduler?
To check the schedule background jobs and to execute them parameters like rdisp/btctime is used. These parameters define background processing batch scheduler.

Q.Explain what is SAP IDES?
SAP Internet Demonstration and Evaluation System or SAP IDES,  this system demonstrate the functionality of various SAP solutions used by important customers.

Q.Explain what is the purpose of TDEVC ?
The purpose of TDEVC contains development classes and packages.

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Q.How many types of work processes are there in SAP ?
There are seven types of work processes they are:

Q.What is the role of “ Application Server” ?
Application Server takes the request from the user and if the request requires data then it connects to the database server and gives output.

Q.What is process for applying patches?
Process for applying patches are:
Download patches from the service to Trans Directory
Using CAR command extract the patches in the Trans Directory
Using SAPM,  import patches into SAP level and Apply

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