Databases Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Oracle (3259)
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Postgre (483)
Sybase (267)
DB Architecture (141)
DB Administration (291)

DB Development (113)
SQL PLSQL (3330)
MongoDB (502)
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Neo4j (82)
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Firebird (5)

Database Management (1411)
Databases AllOther (288)

Databases Interview Questions

Questions Answers Views Company eMail

How does Oracle guarantee data integrity of data changes?

2399

Which environment variables are absolutely critical in order to run the OUI?

2122

What SQL query from v$session can you run to show how many sessions are logged in as a particular user account?

1 3596

Why does Oracle not permit the use of PCTUSED with indexes?

2427

What would you use to improve performance on an insert statement that places millions of rows into that table?

1 3729

What would you do with an in-doubt distributed transaction?

1982

What are the commands youd issue to show the explain plan for select

2 5289

In what script is snap$ created? In what script is the scott/tiger schema created?

2711

If youre unsure in which script a sys or system-owned object is created, but you know its in a script from a specific directory, what UNIX command from that directory structure can you run to find your answer?

2155

How would you configure your networking files to connect to a database by the name of DSS which resides in domain icallinc.com?

1922

You create a private database link and upon connection, fails with: ORA-2085: connects to . What is the problem? How would you go about resolving this error?

1 8974

I have my backup RMAN script called backup_rman.sh. I am on the target database. My catalog username/password is rman/rman. My catalog db is called rman. How would you run this shell script from the O/S such that it would run as a background process?

1 4024

Explain the concept of the DUAL table.

2 6090

What are the ways tablespaces can be managed and how do they differ?

2373

From the database level, how can you tell under which time zone a database is operating?

1 3188

Un-Answered Questions { Databases }

explain GROUPBY & HAVING clause with examples.

2297

Explain four layers of abstraction microsoft architectured?

147

How you provide security to cube? : sql server analysis services, ssas

970

How to create an oracle database?

1054

Can I save my report as html, excel or word? : sql server management studio

959

What are the default system databases in sql server 2000?

1034

How to configure events with firewall?

1049

Do I need ccp4?

980

What is a heap in sql?

1077

How to resolve the orphan use problem? : sql server security

1022

What is the difference between union and union all command?

1096

Is postgresql distributed?

820

What is index hunting and how does it help in improving query performance?

1995

Explain the three Level Architecture of the Database System

955

What are constraints?

1018

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