There is a high demand for professionals with PostgreSQL expertise due to its widespread adoption in various industries. If you’re aiming for a PostgreSQL career, being prepared with the below-listed PostgreSQL interview questions and answers can help you demonstrate your expertise and increase your chances of securing a job. The list comprises basic to advanced-level PostgreSQL questions, along with their well-researched answers.
PostgreSQL is one of the top databases in the world now. When it comes to open-source databases, it has occupied the number two position. So, along with its popularity, the demand for trained PostgreSQL professionals is also growing. Being one of the top training institutions providing quality PostgreSQL training in India, we intend to help the PostgreSQL job aspirants with the most frequently asked questions in the interviews.
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It is called table partitioning.
The partitioned table is a logical structure. It is used to split a large table into smaller pieces, which are called partitions.
The pgAdmin in PostgreSQL is a data administration tool. It serves the purpose of retrieving, developing, testing, and maintaining databases.
We can use MVCC (Multi-version concurrency control) to avoid unnecessary locking of a database.
PL/Python is a procedural language to which PostgreSQL provides support.
PostgreSQL provides the following methods to create a new database:
We can delete the database by using any one of the below options:
|Related article: Comparison Between MongoDB and PostgreSQL|
A schema contains tables along with data types, views, indexes, operators, sequences, and functions.
The PostgreSQL operators include - Arithmetic operators, Comparison operators, Logical operators, and Bitwise operators.
The database callback functions are called PostgreSQL Triggers. When a specified database event occurs, the PostgreSQL Triggers are performed or invoked automatically.
Indexes are used by the search engine to speed up data retrieval.
Cluster index sorts table data rows based on their key values.
Some of these benefits include consistency, compactness, validation, and performance.
To update statistics in PostgreSQL, we need to use a special function called a vacuum.
Though the DROP TABLE command has the ability to delete complete data from an existing table, the disadvantage with it is - it removes the complete table structure from the database. Due to this, we need to re-create a table to store data.
We can delete complete data from an existing table using the PostgreSQL TRUNCATE TABLE command.
The properties of a transaction in PostgreSQL include Atomicity, Consistency, Isolation, and Durability. These are referred to by the acronym, namely ACID.
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The CTIDs field identifies the specific physical rows in a table according to their block and offsets positions in that table.
The commands used to control transactions in PostgreSQL are BEGIN TRANSACTION, COMMIT, and ROLLBACK.
PostgreSQL is an advanced version of SQL. Some of the differences between these two include the following:
PostgreSQL uses SSL connections to encrypt client or server communications so that security will be ensured.
Atomicity property ensures the successful completion of all the operations in a work unit.
Some of the advantages of PostgreSQL are open-source DBMS, community support, ACID compliance, diverse indexing techniques, full-text search, a variety of replication methods, and diversified extension functions, etc.
Write-Ahead Logging enhances database reliability by logging changes before any changes or updates are made to the database
Some of the important data administration tools supported by PostgreSQL are Psql, Pgadmin, and Phppgadmin.
We can store the binary data in PostgreSQL either by using bytes or by using the large object feature.
In a non-clustered index, the index rows order doesn’t match the order in actual data.
It is a location in the disk. In this, PostgreSQL stores the data files, which contain indices and tables, etc.
Yes. There are a few disadvantages. Some of these include the following:
In a SQL Statement, a token represents an identifier, keyword, quoted identifier, special character symbol, or constant.
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Ravindra Savaram is a Technical Lead at Mindmajix.com. His passion lies in writing articles on the most popular IT platforms including Machine learning, DevOps, Data Science, Artificial Intelligence, RPA, Deep Learning, and so on. You can stay up to date on all these technologies by following him on LinkedIn and Twitter.
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