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

Oracle General (1809)
Oracle DBA (Database Administration) (261)
Oracle Call Interface (OCI) (10)
Oracle Architecture (90)

Oracle Interview Questions

Questions Answers Views Company eMail

Explain the wait events in statspack report 'db sequential real'?

579

Explain the wait events in statspack report 'db scattered read'?

541

What is your favorite tool for day-to-day oracle operation?

511

What is the difference between truncate and delete? How would a full table scan behave after?

517

What is difference between co-related sub query and nested sub query?

532

What is oracle full backup?

529

What is pga_aggregate_target?

527

A dba had to remove some archivelogs to free up space in filesystem. Nowwhen the rman job starts to backup archivelogs, it complains about missing archivelogs thatwere deleted by dba. To resolve the issue and continue backing up remainder of archivelogs,which rman command can be used so it wo not complain about missing archivelogs.

570

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?

584

If you had a tablespace, test_tablespace, which consists of three files:test01.dbf, test02.dbf, and test03.dbf, and someone accidentally used the unix command"rm" to delete the file test02.dbf, what else would you need in order to recover all the data thatwas present in test_tablespace at the time that test02.dbf was deleted?

536

Tell me about standby database? What should we watch out for?

510

What is the difference between a materialized view (snapshot) fast refresh versus complete refresh? When is one better, and when the other?

551

Explain the wait events in statspack report 'db scattered read', 'db sequential real', 'enqueue'?

617

What are the steps involved in instance recovery in oracle?

508

What is oracle log switch?

572

Un-Answered Questions { Oracle }

Does oracle charge for java?

1015

what is reindexing?

1618

What happens to the data files if a tablespace is dropped?

1000

What are the data types in oracle?

989

How to view existing locks on the database?

1005

How do you set up tablespaces during an oracle installation?

568

You are getting busy buffer waits. Is this bad? How can you find what is causing it?

505

How a tablespace is related to data files?

1064

Can multiple columns be used in group by in oracle?

937

What is a oracle database?

1004

Explain a private synonyms?

989

Does oracle partitioning improve performance?

949

How to define a record variable to store a table row?

1016

Explain the use of owner option in exp command.

996

What do you understand from cache fusion?

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