Top 50 Oracle Interview Questions with Answers

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Which of the following is not a SQL aggregate function?
a) COUNT
b) SUM
c) AVG
d) UPDATE

Answer: d) UPDATE

Which of the following SQL commands is used to return all rows from a table?
a) SELECT *
b) SELECT ALL
c) SELECT SOME
d) SELECT DISTINCT

Answer: a) SELECT *

Which Oracle database component manages user security and authentication?
a) Database Administrator (DBA)
b) Oracle Internet Directory (OID)
c) Oracle Identity Manager (OIM)
d) Oracle Access Manager (OAM)

Answer: b) Oracle Internet Directory (OID)

Which of the following is not a type of join in SQL?
a) INNER JOIN
b) OUTER JOIN
c) FULL JOIN
d) CROSS JOIN

Answer: c) FULL JOIN

Which Oracle tool is used for monitoring database performance and diagnosing problems?
a) Oracle Grid Infrastructure
b) Oracle Enterprise Manager
c) Oracle Data Guard
d) Oracle Real Application Clusters

Answer: b) Oracle Enterprise Manager

Which SQL keyword is used to sort data in descending order?
a) ASC
b) DESC
c) ORDER BY
d) GROUP BY

Answer: b) DESC

Which of the following data types can store only numeric values with no decimal places in Oracle?
a) NUMBER
b) INTEGER
c) FLOAT
d) BINARY_INTEGER

Answer: b) INTEGER

Which built-in Oracle package can be used to send email from the database?
a) DBMS_OUTPUT
b) UTL_SMTP
c) DBMS_SCHEDULER
d) UTL_FILE

Answer: b) UTL_SMTP

Which Oracle feature allows a single database instance to support multiple databases?
a) Oracle Real Application Clusters
b) Oracle Grid Infrastructure
c) Oracle Multitenant
d) Oracle GoldenGate

Answer: c) Oracle Multitenant

Which SQL keyword is used to limit the number of rows returned in a query?
a) LIMIT
b) OFFSET
c) TOP
d) ROWNUM

Answer: d) ROWNUM

Which Oracle database component handles memory management and optimization?
a) System Global Area (SGA)
b) Program Global Area (PGA)
c) Oracle Shared Server (OSS)
d) Oracle Real Application Clusters (RAC)

Answer: a) System Global Area (SGA)

Which SQL keyword is used to group data in a query?
a) GROUP BY
b) ORDER BY
c) DIVIDE BY
d) MULTIPLY BY

Answer: a) GROUP BY

Which Oracle database component is responsible for managing database backups?
a) Oracle Recovery Manager (RMAN)
b) Oracle Data Guard
c) Oracle Advanced Security
d) Oracle Internet Directory (OID)

Answer: a) Oracle Recovery Manager (RMAN)

Which SQL keyword is used to filter data in a query with multiple conditions?
a) OR
b) AND
c) NOT
d) XOR

Answer: b) AND

Which Oracle tool provides an interface for administering the database?
a) Oracle Data Guard
b) Oracle Net Manager
c) Oracle Enterprise Manager
d) Oracle Performance Analyzer

Answer: c) Oracle Enterprise Manager

Which SQL function is used to find the highest value in a column?
a) MAX
b) MIN
c) AVG
d) SUM

Answer: a) MAX

Which Oracle tool provides real-time performance monitoring and tuning recommendations?
a) Oracle Tuning Pack
b) Oracle Real Application Testing
c) Oracle Diagnostics Pack
d) Oracle Database Vault

Answer: a) Oracle Tuning Pack

Which SQL keyword is used to specify a condition in a query?
a) WHERE
b) WHEN
c) IF
d) THEN

Answer: a) WHERE

Which Oracle database component allows simultaneous access to a single database by multiple users?
a) Oracle Shared Server (OSS)
b) Oracle Real Application Clusters (RAC)
c) Oracle Internet Directory (OID)
d) Oracle Advanced Security

Answer: a) Oracle Shared Server (OSS)

Which SQL function is used to find the average value of a column?
a) AVG
b) MIN
c) MAX
d) SUM

Answer: a) AVG

Which Oracle tool allows developers to design and deploy web applications and web services?
a) Oracle Application Express (APEX)
b) Oracle Forms
c) Oracle WebLogic Server
d) Oracle Business Intelligence Enterprise Edition (OBIEE)

Answer: a) Oracle Application Express (APEX)

Which SQL keyword is used to return only the distinct values in a column?
a) DISTINCT
b) UNIQUE
c) ALL
d) SAME

Answer: a) DISTINCT

Which Oracle database component is used for data replication and disaster recovery?
a) Oracle Database Vault
b) Oracle Data Guard
c) Oracle Streams
d) Oracle GoldenGate

Answer: b) Oracle Data Guard

Which SQL keyword is used to join multiple tables in a query?
a) JOIN
b) MERGE
c) COMBINE
d) UNITE

Answer: a) JOIN

Which Oracle tool provides security policies and controls for database access?
a) Oracle Database Vault
b) Oracle Label Security
c) Oracle Advanced Security
d) Oracle Audit Vault and Database Firewall

Answer: a) Oracle Database Vault

Which SQL function is used to find the lowest value in a column?
a) MIN
b) MAX
c) AVG
d) SUM

Answer: a) MIN

Which Oracle database component is used for workload management and resource allocation?
a) Oracle Grid Infrastructure
b) Oracle Real Application Clusters (RAC)
c) Oracle Resource Manager
d) Oracle Automatic Storage Management (ASM)

Answer: c) Oracle Resource Manager

Which SQL keyword is used to retrieve data from multiple tables using a common column?
a) UNION
b) MINUS
c) INTERSECT
d) JOIN

Answer: d) JOIN

Which Oracle tool provides automated database testing and workload analysis?
a) Oracle Real Application Testing
b) Oracle Data Guard
c) Oracle Diagnostics Pack
d) Oracle Enterprise Manager

Answer: a) Oracle Real Application Testing

Which SQL function is used to concatenate columns or strings together?
a) CONCAT
b) STRCAT
c) MERGE
d) JOIN

Answer: a) CONCAT

Which Oracle database component provides automatic storage optimization and redundancy?
a) Oracle Real Application Clusters (RAC)
b) Oracle Automatic Storage Management (ASM)
c) Oracle Shared Server (OSS)
d) Oracle Streams

Answer: b) Oracle Automatic Storage Management (ASM)

Which SQL keyword is used to modify data in a table?
a) INSERT
b) DELETE
c) UPDATE
d) REPLACE

Answer: c) UPDATE

Which Oracle database component provides workload isolation and management for application services?
a) Oracle Database Vault
b) Oracle Label Security
c) Oracle Resource Manager
d) Oracle Streams

Answer: c) Oracle Resource Manager

Which SQL function is used to count the number of rows in a table?
a) ROWCOUNT
b) ROWSUM
c) ROWAVERAGE
d) COUNT

Answer: d) COUNT

Which Oracle tool provides database backup and recovery automation?
a) Oracle Data Guard
b) Oracle Flashback
c) Oracle Recovery Manager (RMAN)
d) Oracle Advanced Security

Answer: c) Oracle Recovery Manager (RMAN)

Which SQL keyword is used to create a new table?
a) ADD
b) CREATE
c) ALTER
d) MODIFY

Answer: b) CREATE

Which Oracle database component provides high availability and automatic failover?
a) Oracle Streams
b) Oracle Advanced Security
c) Oracle Real Application Clusters (RAC)
d) Oracle Data Guard

Answer: c) Oracle Real Application Clusters (RAC)

Which SQL function is used to convert a value to a character string?
a) STR
b) CONVERT
c) CAST
d) MESSAGE

Answer: c) CAST

Which Oracle tool provides data modeling and design capabilities?
a) Oracle SQL Developer Data Modeler
b) Oracle Application Express (APEX)
c) Oracle Forms
d) Oracle BI Publisher

Answer: a) Oracle SQL Developer Data Modeler

Which SQL keyword is used to delete data from a table?
a) DELETE
b) REMOVE
c) ERASE
d) ELIMINATE

Answer: a) DELETE

Which Oracle database component provides secure storage and encryption of database data?
a) Oracle Advanced Security
b) Oracle Label Security
c) Oracle Data Guard
d) Oracle Transparent Data Encryption

Answer: d) Oracle Transparent Data Encryption

Which SQL function is used to round a numeric value to a specified number of decimal places?
a) ROUND
b) FLOOR
c) CEIL
d) TRUNC

Answer: a) ROUND

Which Oracle tool provides database performance monitoring and analysis?
a) Oracle Enterprise Manager
b) Oracle Diagnostics Pack
c) Oracle Real Application Testing
d) Oracle Application Express (APEX)

Answer: b) Oracle Diagnostics Pack

Which SQL keyword is used to update data in a table?
a) MODIFY
b) ALTER
c) REPLACE
d) UPDATE

Answer: d) UPDATE

Which Oracle database component provides data replication and synchronization across multiple databases?
a) Oracle Streams
b) Oracle Data Guard
c) Oracle Database Vault
d) Oracle GoldenGate

Answer: d) Oracle GoldenGate

Which SQL function is used to calculate the difference between two dates?
a) DATEDIFF
b) DIFFDATE
c) DATEADD
d) SYSDATE

Answer: a) DATEDIFF

Which Oracle tool provides centralized database management for multiple databases?
a) Oracle Enterprise Manager
b) Oracle Grid Infrastructure
c) Oracle Advanced Security
d) Oracle Real Application Clusters (RAC)

Answer: a) Oracle Enterprise Manager

Which SQL keyword is used to add a new column to a table?
a) ADD COLUMN
b) ALTER COLUMN
c) NEW COLUMN
d) COLUMN ADD

Answer: a) ADD COLUMN

Which Oracle database component provides data masking and subsetting capabilities for test databases?
a) Oracle Virtual Private Database (VPD)
b) Oracle Diagnostic Pack
c) Oracle Database Vault
d) Oracle Enterprise Manager

Answer: a) Oracle Virtual Private Database (VPD)

Which SQL function is used to find the length of a string?
a) LENGTH
b) SIZE
c) COUNT
d) SUM

Answer: a) LENGTH

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Ashwani Kumar

Sr. Software Engineer at Cotocus Private Limited

There is no end to education. It is not that you read a book, pass an examination, and finish with education. The whole of life, from the moment you are born to the moment you die, is a process of learning.