PostgreSQL Interview Questions and Answers

PostgreSQL Interview Questions and Answers

PostgreSQL, often simply Postgres, is an object-relational database management system (ORDBMS) with an emphasis on extensibility and standards compliance. As a database server, its primary functions are to store data securely and return that data in response to requests from other software applications. It can handle workloads ranging from small single-machine applications to large Internet-facing applications (or for data warehousing) with many concurrent users; on macOS Server, PostgreSQL is the default database] and it is also available for Microsoft Windows and Linux (supplied in most distributions).

PostgreSQL is ACID-compliant and transactional. PostgreSQL has updatable views and materialized views, triggers, foreign keys; supports functions and stored procedures, and other expandability.

PostgreSQL was designed to run on UNIX-like platforms. However, PostgreSQL was then also designed to be portable so that it could run on various platforms such as Mac OS X, Solaris, and Windows. PostgreSQL is free and open source software. Its source code is available under PostgreSQL license, a liberal open source license. You are free to use, modify and distribute PostgreSQL in any form. PostgreSQL requires very minimum maintained efforts because of its stability.  Therefore, if you develop applications based on PostgreSQL, the total cost of ownership is low in comparison with other database management systems.

PostgreSQL is highly programmable, and therefore extendible, with custom procedures that are called “stored procedures”. These functions can be created to simplify the execution of repeated, complex and often required database operations. Although this DBMS does not have the popularity of MySQL, there are many amazing third-party tools and libraries that are designed to make working with PostgreSQL simple, despite this database’s powerful nature. Nowadays it is possible to get PostgreSQL as an application package through many operating-system’s default package manager with ease.

PostgreSQL, originally called Postgres, was created at UCB by a computer science professor named Michael Stonebraker, who went on to become the CTO of Informix Corporation.

What is PostgreSQL?

What are the features of PostgreSQL?

Explain when is using PostgreSQL?

What is MVCC?

What is WAL?

What is a CTID?

What are indices in PostgreSQL?

What are the database administration tools?

What is command enable debug in PostgreSQL?

What are the advantages of PostgreSQL?

How to start the database server?

How to stop the database server?

How to create a database?

How to take backup of database?

How to create a postgresql user?

Why do I get the error -error: memory exhausted in allocsetalloc ()?

What are the languages which PostgreSQL supports?

What is CBRT Function?

What are the key differences between MySQL and PostgreSQL? Which Open Source Database to Choose? Which one is best?

What are the various enhancements to the straight relational data model by PostgreSQL?

Does PostgreSQL run on the cloud?

What are the disadvantages of PostgreSQL?