For many organizations, the Database Administrator is a critical role that is responsible for maintaining the integrity and availability of the organization’s data. A successful Database Administrator will have a deep understanding of the PostgreSQL platform, as well as a strong background in data systems, database design, and implementation. When interviewing a candidate for a PostgreSQL Database Administrator role, it’s important to assess their technical knowledge and their experience with PostgreSQL databases. To ensure you select the right candidate, you should use a mix of technical and behavioral interview questions. In this blog post, we’ll go through some of the most important PostgreSQL DBA interview questions that you should ask potential candidates.
- What is the process of splitting a large table into smaller pieces called in PostgreSQL? …
- What is a partitioned table in PostgreSQL? …
- What purpose does pgAdmin in PostgreSQL server? …
- How can you avoid unnecessary locking of a database? …
- What is PL/Python?
PostgreSQL Interview Questions and Answers | Postgresql faq
Name the phenomenon that you can prevent between concurrent transactions in PostgreSQL.
This query may enable you to demonstrate your thorough familiarity with PostgreSQL. Your knowledge is evident because only a qualified expert can correctly identify the three phenomena. When answering, name each phenomenon and briefly explain them.
“The three undesirable PostgreSQL phenomena are non-repeatable, dirty, and phantom read,” as an example A transaction known as a “non-repeatable read” looks for another transaction that has already modified data while reading the previously read data again. A transaction that reads data written by concurrent uncommitted transactions is referred to as a dirty read. Phantom read, in contrast, aids in re-executing a query and provides a set of rows that satisfy the search condition. The query looks for rows that match the criteria, which may have changed as a result of another committed transaction.
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In-Depth Questions
These inquiries may be asked during an interview to gauge your subject knowledge and problem-solving abilities. You might be asked the following in-depth questions during your interview:
Describe your experience with PostgreSQL.
This question help shows your familiarity with PostgreSQL. Give a brief description of your knowledge of and experience with this database management system. Give specifics about the prior project you completed using this database when responding.
Example: “The majority of the applications I write use PostgreSQL, which I’ve been using for three years.” It is the standard option for a relational database due to its simplicity of use and potent geospatial functions. MVCC, or multi-version concurrency control, is a feature of PostgreSQL that makes sure the data I supply is reliable. Additionally, it supports JSON and regex, which aids me in handling and resolving parallel queries. I once collaborated with a financial institution on a project, and I used the online transaction processing (OLTP) tools to develop a secure, fast-loading application that complied with all applicable regulations.
Postgres was created in 1986 by Stonebraker as a follow-up to its predecessor, Ingres, which is now owned by Computer Associates. As a result, Postgres plays off of its forerunner (as in “after Ingres”). During its development from 1977 to 1985, Ingres served as a test case for developing a database system in accordance with traditional RDBMS theory. A project called Postgres was created between 1986 and 1994 with the goal of pioneering novel database ideas, such as the investigation of “object-relational” technologies. Multi-Version Concurrency Control (MVCC), point in time recovery, tablespaces, asynchronous replication, nested transactions (savepoints), online/hot backups, a sophisticated query planner/optimizer, and write-ahead logging for fault tolerance are just a few of the advanced features that PostgreSQL’s enterprise-class database has to offer.
In PostgreSQL, tokens serve as the foundation for all source code. The majority of the special character symbols are known to be present in them. These can be viewed as keywords, constants, quoted identifiers, and other identifiers. The meanings and pre-defined SQL commands that make up keyword tokens In place of variable names like columns, tables, etc., identifiers are used.
The term “NoSQL” refers to a broad range of implementations used with non-relational databases. This covers everything from tiny embedded databases like TokyoCabinet to enormously clumped data processing platforms like Hadoop. In conclusion, it is essentially impossible to comment on the scope of NoSQL as a representative class.
You must be able to start the database server before you can access the database. The server program of the database is called Postgres. The Postgres program needs to be aware of where to find the data it needs. This is done with the -D option. Thus, the simplest way to start the server is:
PostgreSQL was created in 1986 as a component of the POSTGRES project at the University of California, Berkeley, and has been actively developed on the core platform for more than 30 years. It is ACID-compliant since 2001 and works with all the major operating systems. It also has add-on like PostGIS database extender. In MAC OS Postgresql is the default database. The Postgres project was started by Michel Stonebraker, the creator of Postgresql, to support modern database systems. Due to the widespread support for the SQL Standard among most relational databases, PostgreSQL’s developers pronounce it as Postgres. Michael Stonebraker, a computer science professor at UCB who later became the CTO of Informix Corporation, invented PostgreSQL, which was first known as Postgres.
Part 1 – PostgreSQL Interview Questions (Basic)
This first part covers basic PostgreSQL Interview Questions and Answers.
Answer: Following are some of the features of PostgreSQL
Answer: Returns Cube Root of a number e. g. , Select ||/ 16 “Cube Root of 16. ”.
Functions are crucial because they aid in the server’s code execution. PL/pgSQL, a native language of PostgreSQL, and other scripting languages like Perl, Python, PHP, etc. are some of the languages used to program functions. The effectiveness of the functions can also be improved by using the statistical language PL/R.
Let us move to the following PostgreSQL Interview Questions.
The feature known as Pgadmin is a graphical front-end administration tool. This function is offered by free software distributed under an artistic license. The new database management tool released with artistic license is called Pgadmin iii.
To avoid needless database locking, multi-version concurrency control, or MVCC, is used. As a result, the user can log into his database immediately. When another user accesses the content, a delay or feature like this one appears. All transactions are kept as a record.
One can never be certain which features will be included in the project update and which ones won’t. Some patches may or may not match the project’s exact and strict quality standards before the deadline. Currently, the 9. Some crucial features, such as JSON support, synchronous replication, nearest-neighbor geographic searches, column-level collation, SQL/MED external data connections, security labels, and index-only access are being worked on for version 1. By the time Postgre 9 launches, this list is very likely to be completely different. 1 is released.
PostgreSQL interview questions and answers
PostgreSQL has many useful features. Here are a few of them:
FAQ
What does a Postgres DBA do?
A PostgreSQL database administrator, also known as a PostgreSQL DBA, creates, maintains, sets up, and fixes PostgreSQL open-source databases. Deploying applications to assist clients and employers use the database for their particular needs is one of the other tasks.
Is Postgres a database or DBMS?
With more than 20 years of community development behind it, it is a very stable database management system with high levels of resilience, integrity, and correctness. Many web, mobile, geospatial, and analytics applications use PostgreSQL as their primary data store or data warehouse.
What type of database is PostgreSQL?
With its many features and extensive use of the SQL language, PostgreSQL is a potent, free, open-source object-relational database system that can scale and store even the most challenging data workloads.
Is Postgres good for large databases?
Large databases and complex queries can both be handled by the feature-rich PostgreSQL database.