21 interview questions on Oracle Database for developers (2025)

Easy

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How to rename a column in an existing table in Oracle?

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Koala rareat Feb 11, 2025

Easy

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What type of join returns all rows in the left-hand table, even if they have no match in the right-hand table?

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Koala rareat Feb 11, 2025

Easy

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What happens after executing this code in Oracle?

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transactions

rollback

Koala rareat Feb 11, 2025

Hard

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Where does Oracle log system errors and critical events ?

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logging

troubleshooting

Koala rareat Feb 11, 2025

Hard

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How to remove all data from an Oracle table without logging the transaction history?

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Koala rareat Feb 11, 2025

Medium

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What are the primary uses of a Materialized View in Oracle?

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Koala rareat Feb 11, 2025

Easy

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What is the length of the string "\u00e9" in Oracle?

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Koala rareat Feb 12, 2025

Easy

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What is the main function of the `DBMS_SCHEDULER` package in Oracle?

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database

scheduling

Koala rareat Feb 11, 2025

Easy

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How to grant SELECT rights on a table in Oracle?

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Koala rareat Feb 11, 2025

Medium

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Which Oracle architecture component contains the in-memory data cache?

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SGA

Koala rareat Feb 11, 2025

Medium

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What is the role of the SYSTEM tablespace in Oracle?

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database

tablespace

Koala rareat Feb 11, 2025

Easy

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What's the difference between VARCHAR2 and CHAR in Oracle?

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varchar2

char

Koala rareat Feb 11, 2025

Easy

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What is the result of this Oracle query?

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NVL

Koala rareat Feb 11, 2025

Easy

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What does this PL/SQL code do?

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cursors

loops

Koala rareat Feb 11, 2025

Medium

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What type of index is recommended for columns with few distinct values in Oracle?

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indexes

bitmap

Koala rareat Feb 11, 2025

Medium

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Which Oracle tool can be used to analyze SQL query performance?

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sql

Koala rareat Feb 11, 2025

Easy

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How to backup a database with RMAN in Oracle?

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backup

RMAN

Koala rareat Feb 11, 2025

Easy

0 vote9 runs0 comment

What happens after executing this code in Oracle?

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transactions

rollback

Koala rareat Feb 11, 2025

Easy

0 vote9 runs0 comment

What does the "INSERT /+ APPEND /" instruction do in Oracle?

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sql

insert

direct path

Koala rareat Feb 11, 2025

Easy

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What does the following SQL query return?

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database

sql

Koala rareat Feb 11, 2025

21 interview questions on Oracle Databasefor developers (2025)

Test your technical skills before an interview of Oracle Database with 21 corrected questions. Beginner, Intermediate or Expert level.

How to rename a column in an existing table in Oracle?

What type of join returns all rows in the left-hand table, even if they have no match in the right-hand table?

What happens after executing this code in Oracle?

Where does Oracle log system errors and critical events ?

How to remove all data from an Oracle table without logging the transaction history?

What are the primary uses of a Materialized View in Oracle?

What is the length of the string "\u00e9" in Oracle?

What is the main function of the `DBMS_SCHEDULER` package in Oracle?

How to grant SELECT rights on a table in Oracle?

Which Oracle architecture component contains the in-memory data cache?

What is the role of the SYSTEM tablespace in Oracle?

What's the difference between VARCHAR2 and CHAR in Oracle?

What is the result of this Oracle query?

What does this PL/SQL code do?

What type of index is recommended for columns with few distinct values in Oracle?

Which Oracle tool can be used to analyze SQL query performance?

How to backup a database with RMAN in Oracle?

What happens after executing this code in Oracle?

What does the "INSERT /+ APPEND /" instruction do in Oracle?

What does the following SQL query return?

21 interview questions on Oracle Databasefor developers (2025)

Test your technical skills before an interview of Oracle Database with 21 corrected questions. Beginner, Intermediate or Expert level.

How to rename a column in an existing table in Oracle?

What type of join returns all rows in the left-hand table, even if they have no match in the right-hand table?

What happens after executing this code in Oracle?

Where does Oracle log system errors and critical events ?

How to remove all data from an Oracle table without logging the transaction history?

What are the primary uses of a Materialized View in Oracle?

What is the length of the string "\u00e9" in Oracle?

What is the main function of the `DBMS_SCHEDULER` package in Oracle?

How to grant SELECT rights on a table in Oracle?

Which Oracle architecture component contains the in-memory data cache?

What is the role of the SYSTEM tablespace in Oracle?

What's the difference between VARCHAR2 and CHAR in Oracle?

What is the result of this Oracle query?

What does this PL/SQL code do?

What type of index is recommended for columns with few distinct values in Oracle?

Which Oracle tool can be used to analyze SQL query performance?

How to backup a database with RMAN in Oracle?

What happens after executing this code in Oracle?

What does the "INSERT /*+ APPEND */" instruction do in Oracle?

What does the following SQL query return?

What does the "INSERT /+ APPEND /" instruction do in Oracle?