Oracle Interview Questions For Freshers

Explain the concept of query optimization in Oracle.

Summary:

Detailed Answer:

What is the basic structure of an Oracle query?

Summary:

Detailed Answer:

How do you select all columns from a table in Oracle?

Summary:

Detailed Answer:

What is a foreign key?

Summary:

Detailed Answer:

What is the purpose of a primary key?

Summary:

Detailed Answer:

What is the difference between UNION and UNION ALL in Oracle?

Summary:

Detailed Answer:

How do you delete a row from a table in Oracle?

Summary:

Detailed Answer:

What is the purpose of the COMMIT statement in Oracle?

Summary:

Detailed Answer:

What is the purpose of the ROLLBACK statement in Oracle?

Summary:

Detailed Answer:

What is a trigger in Oracle?

Summary:

Detailed Answer:

How do you update records in Oracle?

Summary:

Detailed Answer:

What is the difference between VARCHAR and VARCHAR2 in Oracle?

Summary:

Detailed Answer:

What is the purpose of the NVL function in Oracle?

Summary:

Detailed Answer:

Explain the difference between a VIEW and a TABLE in Oracle.

Summary:

Detailed Answer:

What is the purpose of a sequence in Oracle?

Summary:

Detailed Answer:

What is a stored procedure in Oracle?

Summary:

Detailed Answer:

What is the difference between an abstract class and an interface?

Summary:

Detailed Answer:

What is the difference between WHERE and HAVING clauses in Oracle?

Summary:

Detailed Answer:

What is a cursor in Oracle?

Summary:

Detailed Answer:

What is the purpose of the GROUP BY clause in Oracle?

Summary:

Detailed Answer:

Oracle Intermediate Interview Questions

What is the difference between ROLLUP and CUBE in Oracle?

Summary:

Detailed Answer:

What is a subquery in Oracle?

Summary:

Detailed Answer:

What is the purpose of the FOR UPDATE clause in Oracle?

Summary:

Detailed Answer:

Explain the concept of cost-based optimization in Oracle.

Summary:

Detailed Answer:

What is the purpose of the SYS_REFCURSOR data type in Oracle?

Summary:

Detailed Answer:

How do you create a function in Oracle?

Summary:

Detailed Answer:

What is a bitmap index in Oracle?

Summary:

Detailed Answer:

What is optimistic locking in Oracle?

Summary:

Detailed Answer:

Explain the concept of flashback in Oracle.

Summary:

Detailed Answer:

What is the purpose of the CONNECT BY clause in Oracle?

Summary:

Detailed Answer:

How do you use the EXISTS operator in Oracle?

Summary:

Detailed Answer:

Explain the concept of parallel execution in Oracle.

Summary:

Detailed Answer:

How do you create a new table in Oracle?

Summary:

Detailed Answer:

What is the difference between TRUNCATE and DELETE in Oracle?

Summary:

Detailed Answer:

Explain the difference between ROWID and ROWNUM in Oracle.

Summary:

Detailed Answer:

What are the different types of join in Oracle?

Summary:

Detailed Answer:

How do you add a new column to an existing table in Oracle?

Summary:

Detailed Answer:

Explain the concept of index in Oracle.

Summary:

Detailed Answer:

How do you retrieve only unique values from a column in Oracle?

Summary:

Detailed Answer:

Explain the concept of data concurrency in Oracle.

Summary:

Detailed Answer:

What is the purpose of the CASE statement in Oracle?

Summary:

Detailed Answer:

What is a materialized view in Oracle?

Summary:

Detailed Answer:

How do you export data from Oracle to a file?

Summary:

Detailed Answer:

What is the purpose of the MERGE statement in Oracle?

Summary:

Detailed Answer:

Oracle Interview Questions For Experienced

Explain the concept of result caching in Oracle.

Summary:

Detailed Answer:

How do you create a partitioned table in Oracle?

Summary:

Detailed Answer:

What is the purpose of the AUTONOMOUS_TRANSACTION pragma in Oracle?

Summary:

Detailed Answer:

Explain the concept of data compression in Oracle.

Summary:

Detailed Answer:

What is an index-organized table in Oracle?

Summary:

Detailed Answer:

What is the purpose of the WITH clause in Oracle?

Summary:

Detailed Answer:

What is an external table in Oracle?

Summary:

Detailed Answer:

Explain the concept of flashback data archive in Oracle.

Summary:

Detailed Answer:

What is the purpose of the TRANSLATE function in Oracle?

Summary:

Detailed Answer:

What is a virtual column in Oracle?

Summary:

Detailed Answer:

Explain the concept of PL/SQL records in Oracle.

Summary:

Detailed Answer:

What is the purpose of the TABLE function in Oracle?

Summary:

Detailed Answer:

What is a securefile LOB in Oracle?

Summary:

Detailed Answer:

Explain the concept of flashback transaction in Oracle.

Summary:

Detailed Answer:

What is the purpose of the RESULT_CACHE hint in Oracle?

Summary:

Detailed Answer:

How do you create a materialized view log in Oracle?

Summary:

Detailed Answer:

What is the purpose of the MODEL clause in Oracle?

Summary:

Detailed Answer:

Explain the concept of adaptive optimization in Oracle.

Summary:

Detailed Answer:

What is the purpose of the INTERSECT operator in Oracle?

Summary:

Detailed Answer:

What is a system partition in Oracle?

Summary:

Detailed Answer:

Explain the concept of multitenant architecture in Oracle.

Summary:

Detailed Answer: