Today’s digital world requires an application that possesses real time data processing capabilities with built-in in-depth memory. SAP HANA has these qualities and more and has been a real game changer ever since it was introduced. There is an ongoing demand for SAP HANA consultants and to hack your way into this lucrative field, you need to ace the SAP HANA interview.
Any interview in general begins with a brief self-introduction and your career goals, then shifting towards the main topic under discussion. Keep reading to understand the nature of some of the frequently asked questions in an SAP HANA interview and probable answers. Typical entry level questions
1) Briefly describe SAP HANA.
SAP HANA is an in-depth, in-memory database management system that allows real-time data access and processing. Linked to ERP systems, HANA’s main function is to store data and retrieve it in a short time at the users’ request.
2) What are the types of relational data stored in HANA?
SAP HANA is a column-oriented relational database system. It supports two types of relational data: row store and column store.
3) What are the various operating systems that support SAP HANA?
SAP HANA runs on Suse Linux Enterprise Server.
4) Explain briefly what is meant by latency.
The amount time required to replicate data from source system to target system is called latency.
5) Describe why SAP HANA is better than other database applications.
HANA uses column-based data storage in information views and presents real benefits of columnar tables when compared to row-based tables. Though primarily a database, SAP HANA is so much better than that.
SAP HANA provides a seamless integration of both internal and external data. With built-in machine learning and advanced processing capabilities, it can incorporate vast amounts of unstructured data. In-memory technology provides value in real time enabling rapid processing. These functionalities, including agility, flexibility and scalability make SAP HANA so much better than other database applications.
6) Explain the basic database architecture of SAP HANA.
SAP HANA Database is a pre-configured analytical appliance with index server as an important component, which contains SQL/MDX processor to handle query statements for database. Index Server is the heart of the SAP HANA database system. It contains actual data and engines for processing that data.
7) Define transformation rules.
Transformation rule is a rule specified in the advanced replication settings transaction for source tables in such a way that the data is transformed during the replication process. For example, one can specify rules to convert fields fill empty fields and skip records. Rules in transformation are used to map source fields and target fields. Different types of rules are routines, transformation type, rule group and rule type.
8) Explain the storage of data in SAP HANA.
HANA uses column-based data storage in information views and presents real benefits of columnar tables when compared to row-based tables. Here are the advantages of column-based data storage in SAP HANA:
1. Data compression
2. Faster read and write access to tables as compared to conventional row-based storage
3. Flexibility and parallel processing
4. Performs aggregations and calculations at higher speeds
9) Explain the importance of the persistence layer in the SAP HANA application.
Main memory is volatile therefore data is lost during a restart or power outage.
Data needs to be stored in the persisted medium.
Backup and Restore are available in the persistent layer.
It ensures that the database is restored to the most recent committed state after a restart and that transaction are either completely executed or completely undone.
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