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SAP HANA Interview Questions & Answers

Top 50 SAP HANA Interview Questions & Answers

Recently got certified for SAP HANA from Training Expand, the SAP Training Institute in Hyderabad? Are you now searching for job opportunities to start your career as an SAP Certified Professional? To assist with your interview preparation, we have prepared a detailed list with Top 50 SAP HANA Interview Questions & Answers. We kindly request all aspirants to go through this comprehensive list & get ready to crack the interview & get a dream job!

Question 1: Define SAP HANA

In SAP modules, HANA stands for High-Performance Analytical Appliance- an in-memory computing engine. This HANA is linked to ERP Systems and it can be used for replication server management and load control.

Question 2: What are the 2 Different Types of Relational Data Stored in HANA Module?

a) Row Store

b) Column Store

Question 3: Explain the Process Plated by the Persistence Layer in SAP HANA?

With the built-in memory computing engine, SAP HANA can access the data directly without any backup. And to avoid such types of risk of losing data in situations of hardware failure or power cutoff, this persistence layer will help to store all the data in the hard drive which is not volatile.

Question 4: What are the Product Names of SAP HANA?

Recently SAP has done a lot of changes and now they call it SAP HANA Appliance, SAP HANA Database, and SAP HANA Studio. All the applications built on HANA will be marked as “Powered by SAP HANA”

Question 5: What Type of Database does HANA Support in Real-Time?

If the user uses Sybase Replication Server (SRS) for real-time, then you need to watch out for licensing. If you run DB2, then it’s fine, but Oracle and MS SQL Server, you will face some license challenges, if you buy your license through SAP. Because it will give very limited access for data extraction.

Question 6: Explain Modeling Studio?

Using Modeling Studio, SAP HANA performs multiple tasks such as:

a) Instructs which tables are stored in HANA, and declares which first part is to get the Metadata extracted and then schedule data replication jobs.

b) Perform ERP instance connection, if the current release doesn’t support connecting to several ERP instances

c) Manage the data services which needs to enter the data from SAP Business Warehouse or other systems

d) Use data services for the modeling

e) Do modeling in HANA itself

f) Gives essential licenses for SAP BO data services

Question 7: Explain the Different Compression Techniques Used?

a) Run-length encoding

b) Cluster encoding

c) Dictionary encoding

Question 8: Define Latency?

This is defined as the duration required for replicating the data from the source system to the target system

Question 9: Define Transformation Rules?

The rule specified in advanced replication setting transaction for the source table is called Transaction Rules. During this replication process, the data is transformed.

Question 10: Why use Slt Replication?

This works on a trigger-based approach that has no measurable performance which creates an impact on the source system. It can help in:

a)  Comes with filtering capability and transformation

b) Gives real-time data replication system, in which related data will be replicated into HANA from non-SAP and SAP Source System.

c) Integrated with other HANA products such as HABA Studios

d) Performing replication from several source systems to one HANA System is allowed; also, from 1 source system to multiple HANA Systems are also allowed.

Top 50 SAP ABAP Interview Questions & Answers

Question 11: How to Avoid Unwanted Data Being Stored?

To avoid this kind of scenario, you need to pause the replication by stopping the schema related jobs.

Question 12: Define the Role of Master Controller job in SAP HANA Field

Creating and managing database triggers and logging tables into the source system

When a table is replicated or loaded, need to create new entries in admin tables in SLT.

Question 13: What happens if the Replication process is suspended for a longer period of time or system outage?

The size of the logging table will increase, in case if the replication process is being suspended for a longer time period.

Question 14: Explain the Roles & Responsibilities of Transaction Manager and Session?

The main role played by the transaction manager is to coordinate with database transactions and keeps a record of running & closed transactions. When the transaction is rolled back or committed, then the transaction manager notifies the involved storage engines about the event, so they can perform the needed actions.

Question 15: Explain the Process on how the SQL Statement is processed

In the HANA Database, each SQL Statement is implemented in reference to the transaction. And each new session is allotted to a new transaction and this is how the SQL statements are processed.

Question 16: List the Components of SAP HANA?

a) SAP HANA DB

b) SAP HANA Studio

c) SAP HANA Appliance

d) SAP HANA Application Cloud

Question 17: Explain the Process to Perform Backup and Recovery Operations

While performing a regular operation, data is being stored by default to the disks at save points in SAP HANA. As soon as, any update comes, a log becomes active and gets saved from the disk memory. In case of power failure, the database starts restarting and other DB returns of the last save point log state.  So SAP HANA requires a good backup plan against disk failure and reset DB to the previous state.

Question 18: What is SLT Configuration?

This is very important and meaningful information required to establish a connection between sources, SLT System & SAP HANA Architecture as stated in the SLT system. Programmers are allowed to describe & demonstrate a new configuration in the configuration and monitoring dashboard.

Question 19: Define Stall?

The time required for processing the data to load from the main memory to the CPU Cache is called a Stall.

Question 20: What are the Different Types of Information Views?

There are 3 different types of non-materialized information views in SAP HANA and they are:

a) Attribute view

b) Analytic view

c) Calculation View

Question 21: Define Configuration and Monitoring Dashboard?

In SLT Replication Application Servers, these Configuration and Monitoring Dashboards are integrated to provide configuration information for data replication. In the SLT server, these replication statuses can always be monitored.

Question 22: Define Logging Table

This logging table is used to record all the replicated changes that occurred in the table which can be further replicated to the targeted source system.

Question 23: What are the Transformation Rules in SAP HANA

With the use of advanced replication settings, transformation rules are being specified to transfer data from the source system during the replication process. For example:  setting rules to convert fields, vacant fields, skip records, and so on. All these rules are structured using advanced replication settings (transaction IUUC_REPL_CONT)

Question 24: What is the Function Performed by Transaction Manager?

In SAP HANA Modules, the transaction manager helps to maintain database transactions well synchronized by keeping the record of the closed and open transactions. Once the transaction is committed or rolled back, the transaction manager alerts all the active stores and engines about the action, so they can perform the required actions at the right time.

Question 25: Does the SAP HANA System Table Size and the Source System Table Size is the Same?

No

Question 26: Is there any particular time to change the number of Data Transfer Jobs?

If the initial loading speed or replication time is not up to the mark, the number of data transfer jobs needs to be changed. At the end of the initial load, the jobs may be reduced.

Question 27: What are the Advantages & Disadvantages of using Row Based Tables?

Advantages

a) If you want to analyze and retrieve one record at one time, then nondata approach can be faster than row-based

b) Row based tables are useful for accessing the complete record for a specific demand

c) If there is less number of rows, then row-based tables are preferred

d) Data storage & Data Access is easier and effective

Disadvantages

It makes it difficult for data retrieval and data processing if the row is too complex.

Question 28: What is the Purpose of Column Based Tables?

Using Column Based Tables allows smoother parallel processing of data, as the data is stored in vertical order in column tables. And this makes the data access from multiple columns. And every operation can be allocated to a separate processor core.

Using a select query, you can approach specific columns for indexing. Further, since most columns hold unique values, a high compression rate will be there.

Question 29: Which Type of Table is Preferred in SAP HANA – Column Based or Row Based?

Column-based tables are preferred in SAP HANA as the data in columns is stored one after the other which enables faster and easier readability and retrieval.

Question 30: Name the Main Sap Hana Database Component?

The Name Component involved in SAP HANA Database is – actual data engines for data processing including input SQL and MDX statements and performs authentic transactions.

Question 31: Explain the Concept of Persistence Layer

The Persistence layer in SAP HANA handles all the log operations and other transactions for backup and data restoring. And the main concept behind this persistence layer is – it ensures successful data restoration. Further, it also reads and writes data operations via a storage interface.

Question 32: What is Modeling Studio in SAP HANA?

It is an operational tool that works based on Eclipse development and administration, which includes live project creation. This studio further builds development objects and uses them to access and modify data models like HTML and JavaScript Files.

Question 33: What are the Compression Techniques in SAP HANA?

a) Run-length encoding

b) Cluster encoding

c) Dictionary encoding

Question 34: What is SLT – Explain with Abbreviation?

SLT stands for SAP Landscape Transformation referring to trigger-based replication. SLT replication permits data transfer from source to target, where the source can be SAP or non-SAP while the target system has to be SAP HANA with HANA database. Users can accomplish data replication from multiple sources.

Question 35 Define Latency Concept in SAP HANA?

This latency is the time duration required to perform data replication which starts from the source to the target system.

Question 36: List the Different Modules in SAP HANA Administration?

a) SAP HANA Studio

b) SAP HANA Application Cloud

c) SAP HANA Cloud

Question 37: Why SAP HANA Database is in Demand?

SAP HANA Technologies and SAP HANA Studio modules are used to create a next-generation application that gives effective and efficient results in the digital economy. SAP HANA and its features support smooth transaction process along with fault-tolerant analytics. It gives easy and simple operation using a unified platform in the cloud. High-level data integration techniques are being used to access a massive amount of data. It comes with advanced tools for in-depth analysis of the present, past, and future.

Question 38: Explain Parallel Processing in SAP HANA?

By using the column data storage approach, the workload in SAP Hana has been divided vertically. If more than one column is to be processed, each task is assigned to a diverse processor. Operations on one column are then collimated by column divisions processed by different processors.

Question 39: Do I need to buy a HANA 2.5X Smaller than my Oracle RDBMS?

Yes, in certain cases, you may have to buy a HANA appliance that is smaller than oracle DBMS.

Question 40: Does SAP make its own IMDB/HANA hardware?

Yes, but only in the labs so far.

Question 41: How Larger Does HANA Scale?

The biggest single-server HANA hardware will run most mid-size workloads – 2TB of in-memory storage is similar to 5-20TB of Oracle storage.

Question 42: What storage subsystem does HANA use?

HANA runs in-memory remember, so disk storage is just for backup, and later, for data aging. Also, to be noted that it requires 2x storage that you have RAM, which is 2x the database size – i.e. storage size = 4x database size.

Question 43: What source databases does HANA support in real-time?

You need to look for the SAP licensing option if you use Sybase Replication Server for real-time HANA Support.

Question 44: For Batch Loads, Which Database Does HANA Supports?

BO-DS is a very flexible Extract, Transform & Load tool that supports many databases.

Question 45:  Is there any additional limitations does Sybase Replication Server present?

SRS has additional restrictions which are worth bearing in the mind. It can only replicate Unicode data and does not support IBM DB2 compressed tables.

Question 46: Why is SAP HANA unique?

a) It’s the first technology used for both OLTP and OLAP application processing.

b) Facilitates query processing environment for structured as well as unstructured data.

c) Optimizes data structure and eases storing large data by compressing it.

Question 47: List the Platform which uses SAP HANA?

a) Microsoft Windows Vista, 7, 8, Server 2008 (32-bit)

b) Microsoft Windows 7, 8, 10, Server 2008 / R2 (64-bit)

c) SUSE Linux Enterprise Server (SLES) 11 (64-bit)

d) Red Hat Enterprise Linux (RHEL) 6 (64-bit)

e) Mac OS X Mavericks (10.9)

Question 48: How We Can Perform Sizing in SAP HANA?

In SAP HANA, we can perform sizing in three ways:

a) Using Quick Sizer tool

b) Using DB script

c) Using ABAP report

Question 49: What is SAP HANA cockpit?

It allows the single point of access to a range of web-based applications for an online administration of SAP HANA.

To open the SAP HANA Cockpit → Right-click on the HANA system in Studio → configuration and monitoring → open the SAP HANA cockpit.

Question 50: What are the default nodes available in a Calculation view?

a) Join

b) Union

c) Project

d) Aggregation

e) Rank.

These are the Top 50 SAP HANA Interview Questions & Answers available for aspirants who are searching for a job in the SAP industry. If you are looking to learn the advanced concepts of SAP HANA, then you can enroll yourself at Training Expand, the SAP Training Institute in Hyderabad. Join today & get access to learn SAP HANA modules at any time & anywhere!

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