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

Oracle (3253)
SQL Server (4518)
MS Access (429)
MySQL (1402)

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

DB Development (113)
SQL PLSQL (3330)
MongoDB (502)
IBM Informix (50)

Neo4j (82)
InfluxDB (0)
Apache CouchDB (44)
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?

2460

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

2186

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

1 3661

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

2488

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

1 3797

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

2056

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

2 5394

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

2763

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?

2204

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

1977

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 9060

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 4133

Explain the concept of the DUAL table.

2 6178

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

2459

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

1 3260

Un-Answered Questions { Databases }

What is longblob in mysql?

1025

What is a two tier wage system?

873

Explain fully functional dependency?

1019

What are the tradeoffs between many vs few indexes? When would you want to have many, and when would it be better to have fewer?

678

Why partition by is used in sql?

1085

What is table partitioning and why is it required?

What is a pl/sql block?

1345

Is excel a database?

1043

How to scale out a federation by Sql statement?

118

Explain the properties of sub-query in sql server?

1076

What is varchar used for?

1144

How to insert data into mongodb using mongoose?

Can a View based on another View in Oracle?

1075

What is sql view?

1123

What is faster join or union?

1327

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