SAP HANA Interview Questions, SAP HANA Interview Questions and Answers

SAP HANA Interview Questions and Answers, SAP HANA Interview Questions and Answers Freshers, SAP HANA Interview Questions and Answers, SAP HANA Interview Questions

Before getting on to the SAP Hana interview questions, the student must know that the Hadoop is a continuously varying field which needs the students as well as professionals to upgrade their skills with the new features and knowledge, to get fit for the jobs associated. This post related to SAP Hana Interview Questions and Answers, SAP Hana Interview Questions and Answers Freshers, SAP Hana Interview Questions and Answers, SAP Hana Interview Questions will help you let out find all the solutions that are frequently asked in you upcoming SAP Hana interview.

Over thousands of vacancies available for the SAP HANA developers, experts must be acquaintance with all the component of SAP HANA technologies. This is necessary for the students in order to have in-depth knowledge of the subject so that they can have best employment opportunities in the future. Knowing every little detail about SAP HANA is the best approach to solve the problems linked with problem.

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First of all, let us tell you about how the SAP HANA technology is evolving in today’s world and how demanding it is in the upcoming years. In fact, according to one study, most of the companies and businesses have moved to the SAP HANA. Now, you cannot predict how huge the future is going to be for the people experienced in the related technologies.

Hence, if you are looking for boosting up your profile and securing your future, SAP HANA will help you in reaching the zenith of your career. Apart from this, you would also have a lot of opportunities as a fresher.

These questions alone are omnipotent. Read and re-read the questions and their solutions to get accustomed to what you will be asked in the interview. These SAP HANA interview questions and answers will also help you on your way to mastering the skills and will take you to the giant world where worldwide and local businesses, huge or medium, are picking up the best and quality SAP HANA professionals.

This ultimate list of best SAP HANA interview questions will ride you through the quick knowledge of the subject and topics like Trigger Based Replication, Data Provision Options, Relational Reporting. This SAP HANA interview questions and answers can be your next gateway to your next job as a SAP HANA expert.

These are very Basic SAP HANA Interview Questions and Answers for freshers and experienced both.

Q1: Compare SAP HANA & Oracle
A1:

Q2: What is SAP HANA?
A2: SAP HANA is an in-memory computing engine (IMCE) used for real-time processing of huge volumes of data and building and deploying real-world applications. Adopting the row-based and column-based DB technology, SAP HANA is an advanced relational DB product serviced by SAP SE. With this high-performance analytic (HANA) system, the big data exists on the main memory and not on the hard disk. It replaces the onus of data maintenance separately on the legacy system and simplifies the tasks of administrators in this digital world.

Q3: What is the development language used by SAP HANA?
A3: C++

Q4: Name the operating system SAP HANA supports.
A4: More than 70% of customers run their SAP workloads on Linux with the use of SUSE Linux Enterprise Server, which is the best OS choice for SAP HANA.

Q5: Explain Parallel Processing in SAP HANA?
A5: Using the columnar data storage approach, the workload in SAP HANA is divided vertically. The columnar approach allows linear searching and aggregation of data rather than two-dimensional data structure. If more than one column is to be processed, each task is assigned to diverse processor. Operations on one column are then collimated by column divisions processed by different processors.

Q6: List advantages of using SAP HANA database.
A6:

• With the HANA technology, you can create gen-next applications giving effective and efficient results in the digital economy.
• By using singe data-in memory, SAP HANA supports smooth transaction process and fault-tolerant analytics
• Easy and simple operations using an open-source, unified platform in the cloud
• High-level Data Integration to access massive amounts of data
• Advanced tools for in-depth analysis of present, past and the future.

Q7: List the merits and demerits of using row-based tables.
A7:
Merits:

• No data approach can be faster than row-based if you want to analyze, process and retrieve one record at one time.
• Row-based tables are useful when there is specific demand of accessing complete record.
• It is preferred when the table consists of less number of rows.
• This data storage and processing approach is easier and effective without any aggregations and fast searching.

Demerits:

• The data retrieval and processing operations involve the complete row, even though all the information is not useful.

Q8: List advantages of column-based tables.
A8: Allows smoother parallel processing of data as the data in columns is stored vertically. Thus, to access data from multiple columns, every operation can be allocated to a separate processor core.

• Only specific columns need to be approached for Select query and any column can be used for indexing.
• Efficient operations since most columns hold unique values and thus, high compression rate.

Q9: Mention the two types of Relational Data stored in HANA?
A9: The two types of relational data stored in HANA includes
• Row Store
• Column Store

Q10: Mention what is the role of the persistence layer in SAP HANA?
A10: SAP HANA has an in-memory computing engine and access the data straightaway without any backup. To avoid the risk of losing data in case of hardware failure or power cutoff, persistence layer comes as a savior and stores all the data in the hard drive which is not volatile.

Q11: Mention what is modeling studio?
A11: Modeling studio in HANA performs multiple task like

• Declares which tables are stored in HANA, first part is to get the meta-data and then schedule data replication jobs
• Manage Data Services to enter the data from SAP Business Warehouse and other systems
• Manage ERP instances connection, the current release does not support connecting to several ERP instances
• Use data services for the modeling
• Do modeling in HANA itself
• essential licenses for SAP BO data services

Q12: Mention what are the different compression techniques?
A12: There are three different compression techniques
• Run-length encoding
• Cluster encoding
• Dictionary encoding

Q13: Mention what is latency?
A13: Latency is referred to the length of time to replicate data from the source system to the target system.

Q14: Can I just increase the memory of my traditional Oracle database to 2TB and get similar performance?
A14: NO. You might have performance gains due to more memory available for your current Oracle/Microsoft/Teradata database but HANA is not just a database with bigger RAM.

It is a combination of a lot of hardware and software technologies. The way data is stored and processed by the In-Memory Computing Engine (IMCE) is the true differentiator. Having that data available in RAM is just the icing on the cake.

Q15: Q. What does HANA cost?
A15: SAP hasn’t completely affirmed HANA permitting costs yet the equipment is some place around $1-200k for every TB. Add to this permitting costs which are as yet being made on a for every client premise.

Q16: What are the different license keys type in HANA system? What is their validity?
A16:
Temporary License key
Permanent License Key

Temporary License keys are automatically installed when you install the HANA database. These keys are valid only for 90 days and you should request permanent license keys from SAP market place before expiry of this 90 days period after installation.

Permanent License keys are valid till the predefine expiration date. License keys specify amount of memory licensed to target HANA installation.

Q17: If I can run NetWeaver BW on IMDB/HANA, why can’t I run the Business Suite/ERP 6.0?
A17: Just on the grounds that it’s not develop enough yet to bolster business basic applications. From an innovation viewpoint, it is as of now conceivable to maintain the Business Suite on IMDB and SAP has trialed moving some vast databases into IMDB as of now.

Q18: What is SAP HANA cockpit?
A18: SAP HANA cockpit is a SAP Fiori Launchpad site that allows you with a single point-of-access to a range of Web-based applications for the online administration of SAP HANA. You access the SAP HANA cockpit through a Web browser.
To open SAP HANA Cockpit → Right click on HANA system in Studio → configuration and monitoring → open SAP HANA cockpit

Q19: What is a new calculated column in a HANA Modeling view?
A19: New calculated column is defined as a column added on the fly in Analysis tab when a view is activated. This column doesn’t exist at database level or in Data Foundation or Star Join level.

Q20: What is difference between Copy and derived from option while creating a new SAP HANA Attribute information view?
A20: Copy option allows you to copy an existing Information view and to make changes to it.
Derived option allows to create a copy of an existing view and you can’t make any changes to it.

Q21: What is the use of Data Foundation, Star Join and Semantics?
A21: Data Foundation − to add column base tables.
Star Join − to add other type of views.
Semantic − to define user parameters and to define measures and dimensions.

Q22: What are the different user parameters that can be defined in Semantic layer?
A22:
• Measure and Attribute
• Hierarchies
• Parameters/Variables
• New Calculated Column

Q23: What is a new calculated column in a HANA Modeling view?
A23: New calculated column is defined as a column added on the fly in Analysis tab when a view is activated. This column doesn’t exist at database level or in Data Foundation or Star Join level.

Q24: To improve the performance of Information view by validating joins and Cardinality, which option cab be used?
A24: You can select Switch to Performance Analysis Mode. This allows you to do Performance Analysis by validating correct join type and Cardinality.

Q25: What are the benefits of using Calculation view with Star join?
A25: It simplify the design process as allows you to select multiple measures from multiple fact tables.
You can implement 3NF using Star Join.

Q26: What is the operating system supported by HANA?
A26: Currently SUSE Linux Enterprise Server x86-64 (SLES) 11 SP1 is the Operating System supported by SAP HANA.

Q27: Can I just increase the memory of my traditional Oracle database to 2TB and get similar performance?
A27: NO. You might have performance gains due to more memory available for your current Oracle/Microsoft/Teradata database but HANA is not just a database with bigger RAM.

It is a combination of a lot of hardware and software technologies. The way data is stored and processed by the In-Memory Computing Engine (IMCE) is the true differentiator. Having that data available in RAM is just the icing on the cake.

Q28: What are the row-based and column based approach?
A28: Row based tables: It is the traditional Relational Database approach It store a table in a sequence of rows Column based tables: It store a table in a sequence of columns i.e. the entries of a column is stored in contiguous memory locations. SAP HANA is particularly optimized for column-order storage. SAP HANA supports both row-based and column-based approach. Following figure explains the difference between the two storage mechanism. Column based and Row based Tables.

Q29: What are the advantages and disadvantages of row-based tables?
A29: Row based tables have advantages in the following circumstances:
The application needs to only process a single record at one time (many selects and/or updates of single records). The application typically needs to access a complete record (or row). Neither aggregations nor fast searching are required. The table has a small number of rows (e. g. configuration tables, system tables). Row based tables have dis-advantages in the following circumstances: In case of analytic applications where aggregation are used and fast search and processing is required. In row based tables all data in a row has to be read even though the requirement may be to access data from a few columns.

SAP HANA Conclusion Interview FAQs

We know the list of SAP Hana Interview Questions and Answers, SAP Hana Interview Questions and Answers Freshers, SAP Hana Interview Questions and Answers, SAP Hana Interview Questions is overwhelming but the advantages of reading all the questions will maximize your potential and help you crack the interview. The surprising fact is that this SAP HANA interview questions and answers post covers all the basic of the SAP HANA technology and you have to check out the FAQs of different components of SAP HANA too.

However, you will be asked with the questions in the interview related to the above mentioned questions. Preparing and understanding all the concept of SAP HANA technology will help you strengthen the other little information around the topic.

After preparing these interview questions, we recommend you to go for a mock interview before facing the real one. You can take the help of your friend or a SAP HANA expert to find the loop holes in your skills and knowledge. Moreover, this will also allow you in practicing and improving the communication skill which plays a vital role in getting placed and grabbing high salaries.

Remember, in the interview, the company or the business or you can say the examiner often checks your basic knowledge of the subject. If your basics is covered and strengthened, you can have the job of your dream. The industry experts understand that if the foundation of the student is already made up, it is easy for the company to educate the employ towards advance skills. If there are no basics, there is no meaning of having learnt the subject.

Therefore, it’s never too late to edge all the basics of any technology. If you think that you’ve not acquired the enough skills, you can join our upcoming batch of SAP HANA Training in Noida. We are one of the best institute for SAP HANA in noida which provide advance learning in the field of SAP HANA Course. We’ve highly qualified professionals working with us and promise top quality education to the students.

We hope that you enjoyed reading SAP Hana Interview Questions and Answers, SAP Hana Interview Questions and Answers Freshers, SAP Hana Interview Questions and Answers, SAP Hana Interview Questions and all the FAQs associated with the interview. Do not forget to revise all the SAP HANA interview questions and answers before going for the SAP HANA interview. In addition to this, if you’ve any doubt or query associated with SAP HANA, you can contact us anytime. We will be happy to help you out at our earliest convenience. At last, we wish you all the best for your upcoming interview on SAP HANA Technology.