In this article, we’ll discuss the most frequently asked PostgreSQL interview questions so that potential aspirants in this field do not miss out on a chance to excel in any interview process.
PostgreSQL Interview Questions
|Stable release||13.2 / 11 February 2021; 26 days ago Written in: C|
|Initial release date:||July 8, 1996|
|License:||PostgreSQL License (free and open-source, permissive)|
|Operating system:||macOS, Windows, Linux, FreeBSD, OpenBSD|
20+ PostgreSQL Interview Questions 2021
The PostgreSQL database management system is an object-relational database management system (ORDBMS). It’s an open-source object-relational database framework with a lot of power. PostgreSQL is not owned by any company or other private party, and the source code is publicly available. Most major operating systems, including Linux, UNIX, and Windows, support PostgreSQL. Text, photographs, sounds, and video are all supported. It also has C/C++, Java, Perl, Python, Ruby, and Open Database Connectivity programming interfaces.
PostgreSQL is becoming one of the most used databases on the planet at present. As per open-source databases is concerned, it is currently ranked second. As a result, as PostgreSQL’s recognition increases, so does the market for qualified PostgreSQL professionals. Bringing in huge demand for qualified and skilled professionals in this field.
Get prepared with one of the most frequently/commonly asked PostgreSQL interview questions, the questions are as follows-
What is the maximum size for a table in PostgreSQL?
Ans- While PostgreSQL allows users to build limitless databases, it does have a maximum table size cap; a maximum table size of 32 TB has been set. This question has been regarded as one of the most frequently asked questions in PostgreSQL interviews.
Provide a brief explanation of the functions in PostgreSQL
Ans- Functions are crucial as they aid in the execution of code on a server. PL/pgSQL, PostgreSQL’s native language, as well as other scripting languages such as Perl, Python, PHP, etc are some of the languages used to program functions. The statistical language PL/R can also be used to improve the functions’ performance.
What are the features of PostgreSQL?
Ans- There are several interesting features of PostgreSQL namely- SSL replication based on triggers and logs, database redundancy and highly available, possible to use a client-server network architecture, concurrency control for multiple versions is permitted, compatibility with major platforms, languages, and middleware is convenient, and Users can create a fault-tolerant system by maintaining data integrity.
Which is better MySQL or PostgreSQL?
Ans- MySQL is ideal for studying database management systems. It’s also the first option for web-based projects that only require a database for transfers. However, in terms of functionality and efficiency, PostgreSQL is superior. It’s most commonly used for sophisticated query execution, data warehousing, and data processing.
Which are the methods PostgreSQL provides to create a new database?
Ans- Two methods are provided by PostgreSQL to create a new database which includes- using the SQL command CREATE DATABASE and a command-line executable.
What is Multi-Version Concurrency Control in PostgreSQL?
Ans- Multi-Version Concurrency Control (MVCC) is a PostgreSQL specialized approach for enhancing database performance in a multi-user setting. Unlike other databases, PostgreSQL utilizes a multi-version system in which locks obtained for data reading do not interfere with locks obtained for writing data. As a result, the mechanism has become more compartmentalized.
Can you explain pgadmin?
Ans- Pgadmin is a graphical front-end management tool that is also known as a feature. This function is available as part of free software distributed under the Creative Commons Artistic License. pgadmin iii is the latest database management platform published under a creative commons license.
What is table partitioning in PostgreSQL?
Ans- Table partitioning in PostgreSQL is the process of dividing a wide table into minute sections. Table inheritance in PostgreSQL allows for a list and range partitioning. Each partition must be created as a child table by the user.
What are indexes in PostgreSQL?
Ans- The index is a popular way to improve database efficiency in PostgreSQL. As opposed to when there is no index, it helps the database server to locate and retrieve individual rows faster. It also increases the overall overhead of the database system, so users must exercise caution when implementing them. The database search engine uses indexes, which are special lookup tables, to accelerate data retrieval. Simply put, an index is a reference to a particular piece of data in a table.
What are tokens?
Ans- Tokens are the fundamental components of every source code. Many of the special character symbols are considered to be found in them. Constant, quoted identifiers, other identifiers, and keywords are examples of these. Tokens, or keywords, are pre-defined SQL commands with predefined meanings. Variable names, such as columns and tables, are represented by identifiers.
What is an inverted file in PostgreSQL?
Ans- An Inverted file in PostgreSQL is a data structure that maps information to its position in a database file, inside a record, or across multiple files. It typically consists of a list of all the distinct words used in a text as well as a list of all the times a word appears in the text. The inverted file is a data structure that is commonly used in file retrieval systems to facilitate full-text searches.
What are some of the important data administration tools supported by PostgreSQL?
Ans- Pgadmin, Psql, and Phppgafmin are some of the important data administration tools supported by PostgreSQL.
What is command enable-debug?
Ans- The command enable-debug can be used to make all of the applications and libraries compiled. This method generally speeds down the device, but it also increases the size of the binary file. The presence of debugging symbols that help developers in finding glitches or other issues that may occur when working with their document.
What is a CTID of PostgreSQL?
Ans- The CTID in PostgreSQL is a field that occurs in any PostgreSQL table and is special for all data within that table, and it is used to indicate the position of the tuples.
What are the benefits of specifying data types in columns while creating a table?
Ans- Performance, validation, compactness, and consistency are some of the benefits of specifying data types in columns while creating a table.
How is security ensured in PostgreSQL?
Ans- To ensure confidentiality, PostgreSQL employs SSL connections to encrypt client or server communications.