Epsilon Senior Database Administrator Interview Questions and Answers

Q1. Describe about dataguard
Ans. 
Dataguard is an Oracle feature that provides high availability and disaster recovery for databases.
• Dataguard creates and maintains a standby database that can take over in case of a primary database failure.

• It uses redo apply technology to keep the standby database synchronized with the primary database.

• Dataguard can be configured in various modes such as maximum availability mode, maximum performance mode, and maximum...read more
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Q1. Why do you want to switch company
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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
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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
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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. DDL DML DCL TCL
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Q1. Tell me about yourself
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Q2. Your experience in data
Ans. 
I have over 10 years of experience in designing, implementing, and optimizing databases for various industries.
• Designed relational databases for e-commerce websites to handle large volumes of transactions

• Implemented data warehousing solutions for a financial institution to analyze customer behavior

• Optimized database performance for a healthcare organization to improve patient record retrieval speed
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Q3. Your experience in data governance
Ans. 
I have extensive experience in implementing data governance policies and procedures to ensure data quality, security, and compliance.
• Developing and implementing data governance frameworks

• Establishing data quality standards and procedures

• Ensuring compliance with data privacy regulations such as GDPR and HIPAA

• Creating data classification and retention policies

• Training staff on data governance best practices
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Q4. Experience jn data fabric
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Q1. Tell me something about yourself
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Q2. What is your current ctc
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I have agreep on python basic

Q1. AWR,RAC, BASIC QUERY
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Q2. RMAN BACKUP AND RECOVERY
Ans. 
RMAN backup and recovery is a crucial aspect of Oracle Database Administration.
• RMAN (Recovery Manager) is a tool used for backup and recovery of Oracle databases.

• It provides features like incremental backups, block-level backups, and backup compression.

• RMAN can also be used for restoring and recovering databases in case of failures.

• It is important to regularly test backups and recovery procedures to ensure they are wor...read more
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