Postgresql Interview Questions And Answers

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Top Postgresql interview questions and answers for freshers and experienced

What is Postgresql ?

Answer : PostgreSQL is an open-source, object-relational database management system (ORDBMS) available for all major platforms including Linux, UNIX, Windows and OS X. Please mention your exact PostgreSQL version when asking questions

Questions : 1 :: Explain what is PostgreSQL?

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...View answers

Questions : 2 :: State some of the advanced features of PostgreSQL?

These are the following features which are present in PostgreSQL they are1) Object relational database2) Extensibility and support for SQL3) Database validation and flexible API4) Procedural...View answers

Questions : 3 :: Explain about Write Ahead logging?


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...View answers

Questions : 4 :: Explain about Multi version concurrency control?

Multiversion concurrency control (MCC or MVCC), is a concurrency control method commonly used by database management systems to provide concurrent access to the database and in programming...View answers

Questions : 5 :: How to start the database server?

/usr/local/etc/rc.d/010.pgsql.sh start/usr/local/etc/rc.d/postgresql...View answers

Questions : 6 :: How to stop the database server?


/usr/local/etc/rc.d/010.pgsql.sh stop/usr/local/etc/rc.d/postgresql...View answers

Questions : 7 :: How to check whether PostgreSQL server is up and running?

/usr/local/etc/rc.d/010.pgsql.sh status/usr/local/etc/rc.d/postgresql...View answers

Questions : 8 :: What are the languages which PostgreSQL supports?

Some of the languages which PostgreSQL supports are as follows: -It supports a language of its own known as PL/pgSQL and it supports internal procedural languages. Pl/pgSQL can be compared to...View answers

Questions : 9 :: Explain about the command enable debug?


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...View answers

Questions : 10 :: Explain about functions in PostgreSQL?

Functions are important because they help the code to be executed on the server. Some of the languages which can program functions for efficient use are PL/pgSQL which is the native language...View answers

Questions : 11 :: Explain about indices of PostgreSQL?

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...View answers

Questions : 12 :: Explain about Triggers?

By SQL query you can trigger an event. Triggers can be activated with the help of INSERT and UPDATE queries. These can be attached to tables. Triggers more than one can be triggered...View answers

Questions : 13 :: What are the different data types supported by PostgreSQL?

There are different data types which are supported they are: -1) Arbitrary precision numeric's2) Geometric primitives3) Arrays4) XML etcUsers can create their own indexes and make them...View answers

Questions : 14 :: Explain about database administration tools?

There are various data administration tools they are1) Psql2) Pgadmin3) PhppgadminMost of these tools are front end administration tools and web based interfaces. Out of these phppgadmin is...View answers

Questions : 15 :: Explain about pgadmin?

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...View answers

Questions : 16 :: How do you create a data base with postgreSQL?

Creating a database is the primary step in creating a database. A command$createdb newdatabasedbCREATE DATABASEThis creates a new database and a message displays CREATE DATABASE which...View answers

Questions : 17 :: What are the various enhancements to the straight relational data model by PostgreSQL?

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...View answers

Questions : 18 :: Explain about tokens?

Tokens are also known to contain several special character symbols. It can be considered as keyword, constant, identifier and quoted identifier. Keywords include pre defined SQL meanings and...View answers

Questions : 19 :: Explain about string constants?

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...View answers

Questions : 20 :: Explain about concurreny with the help of MVCC?

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...View answers

Questions : 21 :: How to created a database?

/usr/local/bin/createdb...View answers

Questions : 22 :: How to list the number of database?

su -l pgsqlpsql...View answers

Questions : 23 :: How to take backup of database?

/usr/local/bin/pg_dump mydatabase >...View answers

Questions : 24 :: How to create a PostgreSQL user?

CREATE USER usr WITH password...View answers

Questions : 25 :: How to SELECT DISTINCT on multiple columns?

SELECT DISTINCT a,b,c FROM tis roughly equivalent to: SELECT a,b,c FROM t GROUP BY a,b,cIt's a good idea to get used to the GROUP BY syntax, as it's more powerful. For query: UPDATE salesSET...View answers
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