File Name: postgresql interview questions and answers .zip
PostgreSQL is a most advance open source database system. PostgreSQL source code is available free of charge and it is not controlled by any corporation. What is the option that can be used in PostgreSQL to make transactions see rows affected in previous parts of the transaction?
We are going to discuss the most interviewer asked PostgreSQL interview questions for the acknowledgment of future aspirants in this niche. With its strong hand on proven data integrity, reliability, architecture, extensibility, and excellent feature set, PostgreSQL has earned the prominence of being a superior and robust solution globally, thus highly increasing the employment base for this niche. Here in this article, we will be listing frequently asked PostgreSQL Interview Questions and Answers with the belief that they will be helpful for you to gain higher marks. Also, to let you know that this article has been written under the guidance of industry professionals and covered all the current competencies.
It emphasizes mainly on two things, extensibility and standards compliance. It is used to handle lumpsum amount of workloads which ranges from small single-machine applications to the gigantic Internet-facing applications with huge number of concurrent users, working parallely on macOS, linux and windows.
Have a look at wisdom jobs PostgreSQL interview questions and answers to be selected for the interview. One can check the availability of the job across cities including Mumbai, Delhi, Bangalore, Pune and Hyderabad.
Below is the list of frequently asked PostgreSQL interview questions and answers which gets you ready to face the interviews :. Question 1. What Is Postgresql? Answer : This is regarded as one of the most successful open source database in the world. This is also used to create advanced applications. This relies on Object relational database management system.
Question 2. Question 3. Explain About Write Ahead Logging? Answer : This feature increases the reliability of the database by logging changes before any changes or updations to the data base. This provides log of database incase of a database crash. This helps to start the work from the point it was discontinued. Question 4. Answer : Multi version concurrency control or MVCC is used to avoid unnecessary locking of the database.
This removes the time lag for the user to log into his database. This feature or time lag occurs when some one else is on the content. All the transactions are kept as a record. Question 5. Question 6. Question 7. Question 8. Question 9. Answer : This command is used for enabling compilation of all libraries and applications. This process generally slows down the system and it also increases the binary file size. Debugging symbols are present which can assist developers in noticing bugs and problems associated with their script.
Question Explain About Functions In Postgresql? Answer : Functions are important because they help the code to be executed on the server. Explain About Indices Of Postgresql? Answer : There are built in functions such as B-tree, hash table, and GIST indices can be used or users can define their own indices.
PostgreSQL can scan the index backwards. Expression index could be created with the result of an expression. Explain About Triggers? Answer : By SQL query you can trigger an event. These can be attached to tables. Triggers more than one can be triggered alphabetically. These triggers have the capability to invoke functions from other languages.
Answer : There are different data types which are supported they are:. Explain About Database Administration Tools? Answer : There are various data administration tools they are. Most of these tools are front end administration tools and web based interfaces. Out of these phppgadmin is the most popular one. Explain About Pgadmin? Answer : Pgadmin forms a graphical front end administration tool. This feature is available under free software released under Artistic License. Pgadmin iii is the new database administration tool released under artistic license.
Answer : Creating a database is the primary step in creating a database. Answer : There are various enhancements provided to the straight relational data model by postgre SQl they are support for arrays which includes multiple values, inheritance, functions and extensibility. Jargon differs because of its object oriented nature where tables are called as classes. Explain About Tokens? Answer : Tokens are also known to contain several special character symbols.
It can be considered as keyword, constant, identifier and quoted identifier. Variable names such as tables, columns, etc are represented by identifiers. Explain About String Constants? Answer : String constant contains a sequence of characters bound by single quotes. This feature is used during insertion of a character or passing character to database objects.
PostgreSQL allows the usage of single quotes but embedded by a C style backslash. This feature is important in parsing data. What Is Write Ahead Log? How To Created A Database?
What Is A Sequence? Answer : A sequence is a special kind of database object designed for generating unique numeric identifiers. It is typically used to generate artificial primary keys. Answer : CTIDs identify specific physical rows by their block and offset positions within a table. They are used by index entries to point to physical rows.
But it is sometimes useful to identify a row within a transaction when no competing update is expected. Answer : You probably have run out of virtual memory on your system, or your kernel has a low limit for certain resources. Try this before starting the server:. Here are two examples:. Answer : There is no way to query a database other than the current one. Because PostgreSQL loads database-specific system catalogs, it is uncertain how a cross-database query should even behave.
Of course, a client can also make simultaneous connections to different databases and merge the results on the client side. Such "RAC-style" clustering isn't supported. Only replication-based clustering is currently supported. Does Postgresql Have Stored Procedures? How To Pronounce Postgresql? Answer : post-GRES-que-ell, per this audio file. What Are New Features Postgre 9. By the time 9. Answer : Yes. Like other open source databases, PostgreSQL is easy to run in virtual containers and is highly portable.
Non-relational databases preceded relational databases and have existed alongside them for forty years, so choosing between relational and nonrelational databases is nothing new. Users should choose the database whose features, implementation, and community support their current application needs.
Further, using multiple different databases for large projects is fast becoming the norm, and PostgreSQL users are no exception. Answer : This is a topic that can start several hours of discussion. Beyond that, each database user should make his own evaluation; open source software makes doing comparisons very easy. Answer : Multi version concurrency control is used to manage concurrency. This feature is very useful because changes made in the database will not be visible to other users until the transaction is completed.
This removes the need for read locks. ACID principles are given a further boost by this feature and can be implemented in general. Popular Interview Questions.
All Interview Questions. Postgresql Practice Test. IT Skills. Management Skills.
How to create a PostgreSQL user? How to take backup of database? How to list the number of database? How to created a database? Explain about concurreny with the help of MVCC? Multi version concurrency control is used to manage concurrency.
Postgresql is a widely used system for Object-Relational Database Management that is mainly used for large web applications. Every year there are some vacancies, in big companies like Oracle, SQLite, Amazon web services and such others, to fill up in this field. People with technical expertise in the computer can easily crack the interview. Here, we have listed few important and expected questions that may come up in your interview. With a little bit of practice and hard work and thoroughness, the questions can be understood. Going through the questions, you may find some questions that come up almost in every interview.
It emphasizes mainly on two things, extensibility and standards compliance. It is used to handle lumpsum amount of workloads which ranges from small single-machine applications to the gigantic Internet-facing applications with huge number of concurrent users, working parallely on macOS, linux and windows. Have a look at wisdom jobs PostgreSQL interview questions and answers to be selected for the interview. One can check the availability of the job across cities including Mumbai, Delhi, Bangalore, Pune and Hyderabad.
By Priya Pedamkar. It is a powerful, open-source object-relational database system. Any corporation or other private entity does not control PostgreSQL, and the source code is available free of charge. Every interview is different from the different job profiles, but still, to clear the interview, you need to have a good and clear knowledge of PostgreSQL processes. Here, we have prepared the important PostgreSQL Interview Question and answers, which will help you succeed in your interview.
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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Q1. What are the main features of PostgreSQL? · Object-relational database. · Support and extensibility for SQL. · Flexible API and database validation. · MVCC and.