Oracle Interview Questions and Answers - HireWalks: The Ultimate Guide for Job Interview Success

1. What is OCI Oracle cloud?

Oracle Cloud Infrastructure (OCI) offers high compute and storage capabilities in a modular overlay virtual network securely accessible from your on-premises web.

2. What comes in the standard package?

Standard package refers to a set of Tariffs that contains, among other things, rental, call charges, data transport charges, free calls, free data allowances, deposits, and additional charges as decided by the Department for specific Public Telecommunication Services from time to time.

3. What is the OCI API gateway?

A virtual network appliance in a regional subnet is an API gateway in the OCI. Back-end services such as public, private, and partner HTTP APIs and Oracle Functions get through an API gateway.

4. What are the components of Oracle OCI?

The following components are involved in the OCI network:

1) Virtual Cloud Network

2) Subnet

3) Virtual network interface card

4) Security lists

5) Route tables

6) Route rules

5. What is the use of Oracle OCI?

Oracle Cloud Infrastructure (OCI) is a cloud service platform that allows you to construct and execute various applications in a highly available, high-performance environment.

6. What is the BLOB data type in Oracle?

A binary string of changing length is known as a BLOB data type. Two gigabytes of memory get stored in it—the length refers to bytes for the BLOB data type.

7. What is the usage of the control file in Oracle?

For database recovery in Oracle, we will use a control file. When an ORACLE database starts, the control file helps identify the database and redo log files that must open for database operations to proceed.

8. What is the usage of ANALYZE command in Oracle?

Oracle can use the ANALYZE command to conduct various tasks on an index, table, or cluster. The following is a list of Oracle commands that use the ANALYZE command:

1) Used to identify the table or collection’s migrated and chained rows.

2) Used to ensure that the object's structure is correct.

3) It assists the optimizer in gathering statistics about the things it uses. After that, save it in the data dictionary.

4) It aids in the deletion of object-specific statistics from the data dictionary.

9. What are the different types of modules in Oracle forms?

. The following are the various Oracle form modules:

1) Form module

2)Menu module

3) PI/SQL Library module

4) Object Library module

10. You are opting for a standard package. Do you need to pay extra for TDE?

No, Oracle Database is included in all packages, including the regular, enterprise, high-performance, and extreme performance packages. Encryption of Transparent Data

11. What are the features of Oracle OCI?

Security Assessment, User Assessment, Data Discovery, Data Masking, Scalability and Performance, Availability, Backup and Recovery, Security and Activity Auditing are the features in Oracle OCi.

12. What is a hash cluster in Oracle?

Hash clustering is a technique for storing data in hash tables and improving data retrieval performance. The hash function is applied to the cluster key value of each table row and stored in a hash cluster.

13. What are the extensions used by Oracle reports?

Oracle reports empower businesses by securely sharing information at any level within or outside the organization. The Oracle report uses REP and RDF file extensions.

14. What is the purpose of recursive hints in Oracle?

Recursive hint refers to the number of times a dictionary table is called again by various processes. Due to the short capacity of the data dictionary cache, a recursive hint occurs.

15. What is Logical backup in Oracle?

A logical backup is a method of reading and writing a collection of database records into a file. The backup gets created using an Export tool, and the recovery performs using an Import program.

16. What is the save point in the Oracle database?

Savepoints can break up a significant transaction into smaller chunks. It enables the reversal of a transaction. There are a total of five save points available. It's where we keep our data, and if something goes wrong, you can roll back to the point where you saved your SAVEPOINT.

17. Define a snapshot in the context of an Oracle database.

Oracle uses snapshots, also known as materialized views, to duplicate data to non-master sites in a synchronized environment. In a data warehouse context, snapshots are utilized to cache "expensive" searches. In other words, a snapshot is a replica of the target master table taken at a specific point in time.

18. Define a SYSTEM tablespace. When was it created?

A SYSTEM tablespace forms automatically when any database gets created in the Oracle database system. In the SYSTEM tablespace, you'll find all of the database's data dictionary tables. Because the SYSTEM tablespace includes the data dictionary that Oracle requires, it must remain up at all times.

19. Define a tablespace in context with the Oracle database.

A tablespace is the logical storage unit of an Oracle database. Tablespace groups link the database's logical structures together. The data is logically stored in Oracle tablespaces and physically saved in the data files associated with the respective tablespaces.

20. What are the two service levels available with the oracle database cloud service?

1) Database Cloud Service from Oracle Customer is responsible for installing and maintaining software in a virtual image. The customer has complete database administration and root privileges.

2) Database deployment is simple with Oracle Database Cloud Service's custom options available online. Automated backups are possible with the Oracle database cloud service. In the case of a failure, the customer is responsible for putting up maintenance operations and recovery activities.

21. What are the different types of database objects?

Below are the different types of database objects:

1) Tables are a collection of items arranged vertically and horizontally. In Oracle, a tablespace is a logical storage unit.

2) Views are virtual tables that create by combining one or more tables.

3) Indexes are a record-handling performance tuning method.

4) This name refers to tables.

22. What is a hash cluster in Oracle?

23. What do you understand about the memory layers that are in the Oracle shared pool?

In the Oracle shared pool, there are two memory layers:-

Library Cache - The Library Cache contains information about the SQL statements parsed, data about cursors, and any plan data available.

Data Dictionary Cache - The Data Dictionary Cache layer stores information about users' accounts, privileges, and segment information.

Oracle Cloud Infrastructure (OCI) Interview Questions for Experienced

This section contains questions of OCI for experienced candidates who want to crack the interview.

24. What is the Oracle Audit Vault?

Oracle Audit Vault and Database Firewall analyze Oracle and non-Oracle database traffic to detect and block risks and combine audit data from databases, operating systems, directories, and other sources to improve compliance reporting.

25. What is Oracle Data subsetting?

Unlock the value of data while reducing risk and storage costs. Oracle Data Masking and Subsetting enables safe and cost-effective data supply in various scenarios, including test, development, and partner environments.

26. What are Oracle data masking and subsetting?

Oracle Data Masking and Subsetting Pack is a flexible solution for masking and subsetting sensitive production data shared across non-production settings.

27. What does a dynamic routing gateway in OCI do?

Dynamic Routing Gateways (DRGs) are routing gateway that allows you to change your route. A DRG serves as a virtual router, connecting your on-premises networks to VCNs and routing traffic between VCNs. A routing table connects with each DRG attachment and routes packets entering the DRG to the next hop.

28. How can I delete the compartment in OCI?

To delete the compartment in OCI, select Identity & Security from the navigation menu. Select Compartments from the Identity menu. The compartments in your tenancy are listed. To delete a compartment, go to the Actions menu and select Delete Compartment.

29. What is the difference between post-database commit and post-form commit?

The post-database commit triggers after Oracle forms issue a commit to a completed transaction, whereas the post-form commit triggers fires during the post and commit transactions process after the database commit.

30. What is the usage of Save Points in the Oracle database?

Save Points are a way to break down a transaction into smaller chunks. It allows you to undo a portion of a transaction. Oracle Database provides for a maximum of 5 save points. It is possible to roll back from the point where the SAVEPOINT holds whenever an error occurs.

31. There are many different cloud services. Why should I choose Oracle Cloud over others?

Oracle Database is a well-known relational database corporation that has been around for a long time. Oracle Cloud offers a database as a Service. Oracle databases, which support enterprise databases, is a cloud service that can help databases used for testing, development, and live production databases. Oracle Cloud provides high availability and scalability options, business continuity, time savings, and various other benefits. To make things easy, choose a cloud service from a database business.

32. What is the difference between a normal database and an Oracle database cloud service?

Oracle database cloud service is identical to a single-instance Oracle database, except that the database host in the cloud, and Oracle provides all computational resources, such as storage and electricity.

33. Where can you store your oracle database backup in the Oracle Cloud?

Oracle offers a dependable and scalable cloud object storage solution. According to the Oracle website, this is an 8000 TB storage used to store and access data in ever-growing databases. This is the location where Oracle database backup data saves.

34. Can an OCI compartment be nested?

A tenancy can contain hundreds of compartments, and compartments are accessible. Your design's only significant limitation is that you can only create six tiers of nested compartments.

35. What is data safe in OCI?

Data Safe is an Oracle Cloud Infrastructure's Next Generation Security (OCI). Each customer's data is kept in its database to ensure privacy: data Safe data and all access to client databases audits.

36. Which data type in the Oracle database has a varying length binary string?

The Oracle database's BLOB data type is a binary string of changeable length. It is used to store two gigabytes of memory and requires a length specification in bytes. The following is an example for using the BLOB data

37. How is a resource in OCI identified?

A unique ID called Oracle Cloud Identifier assigns to most Oracle Cloud Infrastructure (OCI) resources (OCID). Each resource in a tenancy gets an individual ID.

38. What is an OCI resource?

The Oracle Cloud Infrastructure Resource Manager (OCI Resource Manager) is an Oracle-managed service that automates the deployment and operation of all Oracle Cloud Infrastructure resources.

39. What is the difference between a hot backup and a cold backup in Oracle? Tell about their benefits also.

Hot Backup: A hot backup performs while the database is active. It is also known as an online backup. Some websites cannot shut down their databases while producing backup copies since they use them 24 hours a day, seven days a week.

Cold Backup: A cold backup is an offline backup since it performs while the database shuts down using the SHUTDOWN standard command. If the database is shut down unexpectedly due to an unknown condition, it should be restarted in RESTRICT mode and then shut down using the NORMAL option.

40. What is the Oracle Wallet Manager used for?

Wallet owners use Oracle Wallet Manager to manage and modify the security credentials in their Oracle wallets.

Top 40 Oracle Interview Questions and Answers