DBMS Interview Questions For Freshers & Experienced

DBMS Interview Questions

DBMS vs RDBMS. Which is better?

Pros of DBMS:

• Reduction of Redundancies: One of the astonishing features of the DBMS is that it controls the data. It avoids the undesirable duplication of the data which as a result diminish the entire mass of data storage needed. It also reduces the additional processing to trace the required data in a huge data set. Another advantage of dodging duplication is the removal of the inequality present in the excess data.
• Accessing the Network: An RDBMS includes a server daemon, a software program which is specially designed to catch request sent over a network. It helps in the communication between the database and the database clients. There is no need to log in to the computer system to use or access the database. It not only helps the users with the convenience but also with the security layer for the database. Many developers use this network access facility to build web apps and desktop tools to cooperate with the database.
• Security: Data is very important to an organization and may be confidential. It has to be clear that this confidential data should not be accessed by an unauthorized person. The DBA assures that proper authentications are followed, including proper procedures for access to the DBMS and extra checks before allowing access to the sensitive data. For the safety of the data and operation, different levels of security are implemented.
• Language: RDBMS maintains the language SQL. It is because the syntax of SQL is simple. It executes phrasing and keywords in the English language which helps in making it easier to learn and interpret. An RDEMS is also known to add functions, non-SQL database-specific keywords, and features to this SQL awesomeness.
• Reduced updating errors and increased consistency: Another main advantage of the RDBMS is that it increases consistency and updating errors. In its operation, the database offers end-user consistency. Moreover, there are several events of data errors within a database which creates consistency.
• Better Decision making: If we have quality information, then it is obvious that we can take better decisions. This same happens in the case of DBMS that let the users take quick decisions very easily. The data transformation tools generate valuable information from underlying data and empower developers to make good choices.

Cons of DBMS:

• Cost: Maintaining and setting up a database is not as much easier as it sounds. The expenses are relatively high and one of the disadvantages of relational databases. Moreover, to set up relational databases, special software is required and this could cost a fortune.
• Update Information: For non-programmers, they would need to implement several products to set up this database. It might not be an easy task to update all the information and finally get the program running. As large firms need a more vigorous database, so it becomes important for them to get external help from an expert programmer to develop a relational database implementing SQL.
• Complexity: The requirement of functionality from a good DBMS makes it an extremely complex piece. The developers, end-users, designers and database administrators must understand the functionality to have benefits of it.
• Large size: The complexity of DBMS makes it a large piece of software. So. to fulfill the functionality, the size of DBMS gets bigger which occupies a large space of disk space and makes the program slow.