How to pass a PostgreSQL Interview and get the job of your dreams?
A comprehensive guide to PostgreSQL most frequently asked Interview questions.
A job interview is the first essential step on the way to your career ambitions. To pass it successfully, an applicant usually has to demonstrate a whole set of skills from the fundamental knowledge of the profession and its theoretical aspects to skills and qualities such as efficiency, eloquence, etc.
That is why comprehensive educational projects like CRS Info Solutions often emphasise preparing their aspirants for the actual job interview and providing them with the necessary knowledge and hands-on experience.
PostgreSQL is one of the most popular and demanded DBMS today. No wonder applying for a Developer of related Software Architect position, you will definitely have to answer questions related to this system.
Moreover, being one of the most flexible and compilable SQL-based DBMS, PostgreSQL provides you with an almost limitless framework, making professionals familiar with the system highly versatile and therefore highly-demanded on the modern job market.
Why should you prepare for the PostgreSQL Interview?
In this article, we decided to go through the most frequently-asked as well as rather tricky PostgreSQL and answers to them that will let you demonstrate your knowledge of the system along with the ability to express yourself and provide the relevant solution for any issue.
It is essential to understand that no matter how vast your knowledge of PostgreSQL, the way you answer the questions is not less important than the accuracy.
That is why, unlike many similar guides, we aim to provide the most eloquent and straight-to-the-point PostgreSQL Interview questions and answers. Having a limited time, the interviewer needs to learn as much as possible about your level of skills and readiness for the job. The ability to answer quickly and precisely, and provide all the necessary information without getting into protracted discussions will be your key success factor and tangible advantage over fellow applicants.
Top PostgreSQL Interview questions and how to answer them.
What are the critical features of PostgreSQL?
PostgreSQL has certain distinctive features that make this DBMS especially popular today:
- It allows users to build a fault-tolerant environment, thanks to its data integrity protection.
- It supports multi-version concurrency control and has a high availability standby server.
- It supports the client-server network architecture and has a trigger and log-based replication SSL.
- It is easily compatible with several platforms, languages and middleware.
What is the best application for PostgreSQL?
PostgreSQL is one of the most versatile DBMS today, allowing a developer to work outside of its built-in features. Therefore, it is best applicable for projects that require seamless integration of other tools, several programming languages, and platforms simultaneously.
Does PostgreSQL have any significant disadvantages?
PostgreSQL is still not that famous and therefore widely used as analogue DBMSs such as MYSQL, for example. Also, there are still open-source apps that support their counterparts but do not work with PostgreSQL. However, elimination of those disadvantages is only a matter of time and promotion.
What are Sequence and Connector Libraries in PostgreSQL?
- The Sequence is a user-defined and schema-bound object used for the generation of a sequence of integers. The statement for Sequence built is “CREATE SEQUENCE”;
· Connector libraries are a series of connectors. The user can download them and customise using any ProcessMaker. It manages and updates the connector public library.
Does PostgreSQL run on the cloud?
Like any other open-source database, PostgreSQL runs on the cloud. However, due to its portability, this DBMS can run in virtual containers.
What are Indexes in PostgreSQL?
An index is one of the most common means of performance enhancement in PostgreSQL. It helps to retrieve specific rows faster by a data server.
What is the Multi-Version Concurrency Control in PostgreSQL?
The Multi-Version Concurrency Control (MVCC) instantly enhances the performance of the Database, which several users are simultaneously fastening. It serves as an efficient divider and allows to avoid conflicts that can occur once several users work on the same Database at the same time.
What is the distinctive feature of MVCC?
MVCC is a unique system that prevents unwanted locks of a database. Unlike any other system, it is able to remove the time lag that should appear when another user gets access to the Database. However, MVCC keeps a record of all transactions for security reasons.
What is Full-Text Search?
Full-Text Search is a function that allows finding one or several computer-stored documents in full-text databases. It is more efficient than regular Search because it focuses on metadata or even parts of the search request found in the Database.
What are the GIST and BRIN indexes in PostgreSQL, and the difference between them?
- BRIN helps PostgreSQL to detect maximum and minimum values by reading the selected column for every 8K page of stored data. PostgreSQL will then use those values in the search process entitling page number for the chosen columns in these indices. ;
- GiST is an extendable data structure. It allows users to create indices to manipulate any data. Then it inserts an API to the index system of PostgreSQL to empower. Further data search.
What are the Functions of PostgreSQL?
Functions are used in PostgreSQL to execute the code on the server. To program functions, Developer uses:
- Languages like PL/pgSQL;
- Scripting languages like Perl, Python and PHP;
- Statistical language PL/R;
- The native PostgreSQL language.
Those are the only 10 most frequently asked PostgreSQL Interview questions. The conversation may change and jump from one topic to another due to the level of your skills, ability to demonstrate them and the specific of the given company, of course.
However, the main idea is to be prepared for the Interview itself, listen to the question and be able to distinguish its purpose and intention to give the answer that will fit your prosperous employer’s expectations.
It is one of the critical skills that can often become a decisive factor. Therefore preparation for the PostgreSQL Interview should be an integral part of your training.