SQLSTAR Solutions Junior Oracle Database Administrator Interview Questions and Answers

Q1. OEM services-related Questions
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Q2. What is Oracle Block Change
Ans. 
Oracle Block Change is a feature that tracks and records changes made to database blocks.
• Oracle Block Change is used for efficient data replication and synchronization.

• It helps in identifying and transferring only the changed data blocks instead of the entire database.

• Oracle GoldenGate utilizes Oracle Block Change technology for real-time data integration.

• Block Change Tracking (BCT) is a feature in Oracle Database that...read more
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Q3. In RAC database 2 nodes are there how you will re-direct users to 2nd node only?
Ans. 
To redirect users to the 2nd node in a RAC database, you can use services and connection load balancing.
• Create a service for the 2nd node in the RAC database.

• Configure connection load balancing to distribute connections evenly between the nodes.

• Update the connection string in the application to point to the service for the 2nd node.

• Test the connection to ensure users are redirected to the 2nd node.
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Q1. What is dba, explain the architecture of dba
Ans. 
DBA stands for Database Administrator. The architecture of DBA involves managing and maintaining databases to ensure data integrity and security.
• DBA is responsible for installing, configuring, and upgrading database software.

• They monitor database performance and troubleshoot issues.

• DBA designs and implements backup and recovery strategies to prevent data loss.

• They also manage user access and security permissions within...read more
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Q2. How you will maintain the database and what are the types of backup
Ans. 
Maintaining the database involves regular monitoring, performance tuning, applying patches, and ensuring backups are taken regularly.
• Regularly monitor database performance and usage

• Perform routine maintenance tasks such as applying patches and updates

• Take regular backups to ensure data integrity and disaster recovery

• Implement security measures to protect the database from unauthorized access

• Optimize database performanc
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Q1. What is CAP theorem What is column families What function are used in cassandra what is key value pair
Ans. 
CAP theorem states that in a distributed system, it is impossible to simultaneously guarantee consistency, availability, and partition tolerance.
• CAP theorem: Consistency, Availability, Partition tolerance - pick two

• Column families: A way to organize data in NoSQL databases like Apache Cassandra

• Functions in Cassandra: read, write, delete, update

• Key value pair: Basic data structure where each key is associated with a val
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Q2. What is Cloumn families
Ans. 
Column families are a way to organize related data in a NoSQL database, grouping columns together for efficient retrieval.
• Column families are a way to group related columns together in a NoSQL database.

• They are used in databases like Apache Cassandra to organize data efficiently.

• Column families can contain a large number of columns, each with a unique name and value.

• They are stored together on disk for faster retrieval...read more
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Q3. What are the functions in cassandra
Ans. 
Cassandra functions are used for data manipulation and retrieval in Cassandra database.
• Aggregate functions like COUNT, SUM, AVG, MIN, MAX

• Date and time functions like NOW, DATEOF, UNIXTIMESTAMP

• Mathematical functions like ABS, CEIL, FLOOR, SIN, COS

• String functions like LENGTH, SUBSTRING, CONCAT, LOWER, UPPER
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Q4. Fundamentels of cassandra
Ans. 
Cassandra is a distributed NoSQL database management system designed for handling large amounts of data across multiple servers.
• Cassandra is a highly scalable and fault-tolerant database system.

• It is based on a distributed architecture, with data spread across multiple nodes.

• Cassandra uses a masterless design, where all nodes are equal and can handle read and write requests.

• It uses a partitioning strategy called consis...read more
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Q5. What is key value pair
Ans. 
Key value pair is a data structure where each key is associated with a corresponding value.
• Key value pairs are commonly used in dictionaries, hash tables, and JSON objects.

• Keys are unique identifiers that are used to access the corresponding values.

• Examples include 'name: John', 'age: 30', 'city: New York'.
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Q1. Dataguard architecture
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Q2. Rman backup and restoration
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Q1. Why you join inm
Ans. 
I joined inm because of the company's reputation for innovation and growth in the tech industry.
• Attracted to company's reputation for innovation

• Excited about opportunities for growth in tech industry

• Impressed by company culture and values
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Q1. What is database architecture?
Ans. 
Database architecture refers to the design and structure of a database system.
• Database architecture includes the organization of data, storage, retrieval, and security mechanisms.

• It involves defining the relationships between data elements and how they are stored and accessed.

• Examples of database architectures include hierarchical, network, relational, and object-oriented.

• Database architecture also includes the choice ...read more
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Q2. Difference between delete and truncate
Ans. 
Delete removes rows one by one, while truncate removes all rows at once.
• Delete is a DML command, while truncate is a DDL command.

• Delete can be rolled back, while truncate cannot be rolled back.

• Delete fires triggers, while truncate does not fire triggers.

• Delete is slower as it logs individual row deletions, while truncate is faster as it logs the deallocation of the data pages.

• Example: DELETE FROM table_name WHERE condi
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It was good interview everyone was friendly

Q1. Why are you switching your current job
Ans. 
Seeking new challenges and growth opportunities in a more dynamic environment.
• Looking for new challenges and opportunities for growth

• Interested in working in a more dynamic environment

• Seeking to expand my skills and knowledge in a different setting
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Q2. What is your expected CTC
Ans. 
My expected CTC is negotiable based on the job responsibilities and market standards.
• My expected CTC is based on my experience, skills, and the job requirements.

• I am open to discussing the salary range during the interview process.

• I am looking for a competitive salary package that aligns with industry standards.

• I am flexible and willing to consider other benefits in addition to the salary.
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Q1. Why this company
Ans. 
I am impressed by the company's innovative technology solutions and strong reputation in the industry.
• The company has a track record of developing cutting-edge technology solutions.

• I admire the company's commitment to excellence and continuous improvement.

• The company's reputation for providing top-notch training and development opportunities is appealing to me.
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Q2. What salary do you expect
Ans. 
I expect a competitive salary based on my experience, skills, and the market rate for Oracle Database Administrators.
• Research the average salary range for Oracle Database Administrators in your area

• Consider your level of experience and skills when determining your salary expectations

• Be prepared to negotiate based on the specific responsibilities and benefits offered by the employer
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Te Question can came throuth:-
1. How can you take out the details or values from two tables?
2. How can you add Columns and Values in a table?

They can give us some Assistant to do