Top 70+ Most Asked PostgreSQL Interview Questions

A comprehensive guide covering PostgreSQL fundamentals, architecture, MVCC, indexing, performance tuning, and modern cloud deployment.

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1.What is PostgreSQL?

2.Describe PostgreSQL.

3.What are the most important features of PostgreSQL?

4.What are the features and capabilities of Postgres DB?

5.What do you think are some of the advantages of using PostgreSQL?

6.Do you think there are any disadvantages with PostgreSQL?

7.What drawbacks does PostgreSQL have?

8.What are the main differences between SQL and PostgreSQL?

9.Which is superior, PostgreSQL or MySQL?

10.How Do Oracle/db2/ms SQL Server/Informix and Postgresql Compare?

11.What contrasts exist between PostgreSQL and NoSQL?

12.Is PostgreSQL a Cloud-based Database?

13.What does PostgreSQL's Multi-Version Concurrency Control mean?

14.What does 'Multi-version Control' mean?

15.How does PostgreSQL handle concurrency with Multi-Version Concurrency Control (MVCC)?

16.What is the significance of PostgreSQL's WAL (Write-Ahead Logging)?

17.How does Write-Ahead Logging help you?

18.Explain the concept of VACUUM in PostgreSQL and why it is necessary.

19.What is a CTID in PostgreSQL?

20.What purpose does the CTIDs field serve?

21.What methods does PostgreSQL provide to create a new database?

22.How can you delete a PostgreSQL database?

23.What would be the most important pieces of information you would want to include in a schema?

24.What are the benefits of specifying data types in columns while creating a table?

25.What is the process of splitting a large table into smaller pieces called in PostgreSQL?

26.What is the PostgreSQL feature called that splits a large table into smaller pieces?

27.What does a PostgreSQL partitioned table look like?

28.What does PostgreSQL table partitioning entail?

29.How can you implement partitioning in PostgreSQL, and what are its advantages?

30.How can you completely delete a table?

31.What do you think is the disadvantage of the DROP TABLE command?

32.What do you think indexes are used for?

33.What do PostgreSQL indexes do?

34.What are the different types of indexes in PostgreSQL, and when should each be used?

35.What do you think is a Cluster index's purpose?

36.What does a Cluster index do?

37.What do you think of the term 'non-clustered index'?

38.How are queries involving several databases carried out?

39.What do you need to do to update statistics in PostgreSQL?

40.How are PostgreSQL stats updated?

41.What is the role of pg_stat_statements in PostgreSQL, and how can it be used for query optimization?

42.What kinds of Data Types does PostgreSQL support?

43.Explain the concept of JSONB in PostgreSQL and its benefits.

44.What exactly are string constants?

45.What do PostgreSQL tokens mean?

46.What does a token in a SQL statement represent?

47.What are the different properties of a transaction in PostgreSQL? Which acronym is used to refer to them?

48.How does PostgreSQL handle transactional integrity, and what are the ACID properties?

49.Which are the commands used to control transactions in PostgreSQL?

50.What is the function of the Atomicity property in PostgreSQL?

51.Provide a brief explanation of the functions in PostgreSQL.

52.Describe PostgreSQL Functions in detail.

53.Explain Triggers.

54.What are database callback functions called? What is its purpose?

55.What do you think are database call back functions? How do they help your application?

56.What are Materialized Views in PostgreSQL, and how do they differ from regular views?

57.How do you perform replication in PostgreSQL, and what are the available methods?

58.What is a Hot Standby in PostgreSQL, and how does it work?

59.Is it possible to set up a PostgreSQL server cluster with shared storage?

60.What do you know about PL/Python?

61.What is Full-Text Search? Does Postgresql offer support for it?

62.How does PostgreSQL support full-text search, and what are its key features?

63.What do you understand by inverted files in PostgreSQL?

64.What is a Foreign Data Wrapper (FDW) in PostgreSQL, and how can it be used for data integration?

65.How is security ensured in PostgreSQL?

66.How can you avoid locking a database unnecessarily?

67.What are Advisory Locks in PostgreSQL, and how can they be used for application-level locking?

68.How do you think you can store binary data in PostgreSQL?

69.What purpose do you think table space serves in PostgreSQL?

70.What purpose does pgAdmin serve in PostgreSQL?

71.Describe pgAdmin?

72.What are some of the important PostgreSQL administration tools?

73.What are Connector Libraries?

74.What are some of the different operators in PostgreSQL?

75.What Has Changed in PostgreSQL 9.1?

76.What Different PostgreSQL Enhancements Are Made To The Straight Relational Data Model?

77.What are the benefits and challenges of using PostgreSQL in a cloud environment?