Database Interview Questions and Answers

These days the demand for strong database management is pretty strong and seems to be growing lot more in many companies. Be it in a small company or a large one, the experts need database employees who can help then get the right candidate for their organization. With the experienced IT professionals being interviewed and hired as a database administrator and developer, here are some of the popular database questions and its answers which you can take help of as a sample.

Why do you think this job is right for you?

From this, the interviewer is just trying to understanding your point of view about the job profile that has been shared by the company. You must answer what made you grab this opportunity along with the skills that you hold which you think do complement for the job.

How many years of experience do you hold in database?

Whatever experience you have relevant and irrelevant to job profile that has been shared must be told to the employer. With this, interviewer is keener to know if you are flexible enough to work on different projects or will stick up to the single job profile.

Can you work under the team?

Well, the job profile that you share need lot of interaction with colleagues and clients. Hence, you need to be extremely flexible and comfortable in the changing working environment. Try to answer in a positive manner so that your interviewer can understand that you wish to work ahead with the flexible environment around.

Database-interview-Q&A

Can you brief us about DBMS?

The full form of DBMS is the database management system. It is a set of programs which allows the user to store, get, update and even delete or make any sort of changes in the data present the database.

Do you have an idea about RDBMS?

The full form of RDBMS is Relational Database Management system. This aforementioned database management system depends on the relational model. The data from such system can be access in different ways without any need to reorganizing the database tables.

What opinion do you have on SQL?

The full form of SQL is Structured Query Language. Your tone of answer should be personalized while explaining them about this format. This type of language is designed to communicate with the databases.

Can you explain us about Hibernate?

It is one of the mapping library in which the java objects are taken and then they are mapped into a relational database tables. There are query languages such as HQL which replaces SQL at this the places where the requirement of SQL falls short.

What are Hadoop and Hive?

Hadoop offers the set of libraries with huge data sets. Thus, it offers the file system with the large scale data processing such as map-reduce. Hive; there is top layer on the Hadoop for any kind of queries and analysis.

What is NoSQL?

The full form of Not only SQL. It is alternative to the relative database. In this database, the use of graph store and key store is more. Other than this, there is also database communication and wide-column store available. In agile development world, it is quite popular.

Any risk of storing the objects in a cache that are hibernate managed?

Generally there can be primary issues when the object will outlive the session from where it came from. The already loaded properties may not get loaded later. If you know how to overcome the problem, you can also advise them about the same.

What are different types of SQL’s statements?

SQL statements are classified in three languages namely Data Definition Language, Data Manipulation Language, and Data Control Language. Each of these holds a property to manipulate, control and even define the structure of the data.

Any idea about field in a database?

In this, while giving answer to the interviewer; you can also give them some example. A field in a database is nothing but the field within the record which has been stored for certain data. The example for the same can be employee ID and employee name.

What is a Record in a database?

Here also you must explain the interviewer about the term along with the example. A record which is found in the database is the collection of field or values of certain entity such as salary or employee.

Explain about Table in a database?

It is nothing but the collection of records for certain type such as salary table and employee table. You might find some of these questions pretty simple but this is only to judge how quick you respond and whether you have an alert mind or not. Hence, for such question, always give certain examples.

Any idea about durability in DBMS?

When the user gets the necessary information from the DBMS about the transaction that has been made, there will be its effect noticeable even at the crash of the system. This property of the notification is called durability.

Can you explain us about atomicity and aggregation?

During automaticity all actions are carried out or none of them are considered where as in aggression, a relation between the entries is modeled in professional manner.

Any idea about checkpoint and When does it occur?

It is similar to the snapshot of the DBMS state. With such checkpoints, the DBMS can minimize the amount of work which needs to be done while starting of certain crashes.

Explain us different phases of transaction?

Analysis phase, undo, and Redo Phase are the common phases of transaction which are used on a large scale in database management services.

How soon can you join us?

If the interviewer is much satisfied about the answers that you have given, then surely you need to assure them about you join. It is expected that you join them soon, if you get selected.

Are you flexible to work for SQL or NoSQL?

Such question is generally asked to know whether you are quite flexible enough to perform the task that too given within the deadlines or not.

While applying for database job, ensure that your resume is accurate and realistic. Ensure that you have brushed up your interview skills so that you can showcase your technical skills in the interview.

 

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