Mirra HealthCare Interview Questions and Answers

Q1. What is distributed architecture and disconnected architecture?
Ans. 
Distributed architecture is a system where components are spread across multiple computers. Disconnected architecture is a system where components can operate independently without a constant connection.
• Distributed architecture involves multiple computers working together to achieve a common goal.

• Disconnected architecture allows components to operate independently without a constant connection to a central system.

• Distr...read more
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Q2. What is stateless and state management?
Ans. 
Stateless refers to a system that does not store any data or information about previous interactions. State management is the process of managing and maintaining the state of a system.
• Stateless systems do not rely on previous interactions or data to function

• State management involves keeping track of the current state of a system

• State can be managed through various techniques such as cookies, sessions, and local storage

• ...read more
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Q3. What are sessions? What is Caching?
Ans. 
Sessions are a way to maintain state between HTTP requests. Caching is a technique to store frequently accessed data in memory.
• Sessions are used to store user-specific data across multiple requests

• Caching is used to improve performance by storing frequently accessed data in memory

• Sessions can be implemented using cookies or server-side storage

• Caching can be implemented using in-memory caches or distributed caches like ...read more
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Q4. What is disadvantage of using indexes?
Ans. 
Indexes can slow down write operations and take up additional storage space.
• Indexes can slow down write operations because every time data is added, updated, or deleted, the index must also be updated.

• Indexes can take up additional storage space because they are essentially a copy of the data in the table, just sorted differently.

• Indexes can also become fragmented over time, which can lead to decreased performance.

• Inde...read more
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Q5. What is referencial integrity?
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Referential integrity ensures that relationships between tables in a database remain consistent.
• It is a set of rules that ensures that the relationships between tables in a database are maintained correctly.

• It prevents orphaned records in a database by enforcing constraints on foreign keys.

• For example, if a record in one table has a foreign key that references a record in another table, referential integrity ensures th...read more
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Q6. What is difference between left join and left outer join?
Ans. 
Left join and left outer join are the same thing.
• Both return all records from the left table and matching records from the right table.

• The only difference is in the case of no matching records in the right table.

• Left join returns null values for the right table columns while left outer join returns all columns with null values for non-matching records.
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Q7. What is observable and subscribe?
Ans. 
Observable and subscribe are two important concepts in reactive programming.
• Observable is a stream of data that emits values over time.

• Subscribe is a method that listens to the emitted values from an observable.

• Observable can be created from various sources like events, promises, arrays, etc.

• Subscribe can have three callbacks - next, error, and complete.

• Next callback is called when a new value is emitted, error callbac...read more
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Q1. Question based on resume
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Q2. Scenario based question
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Q1. Resume based question
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Q1. Scenario based question
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Q2. Resume based question
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Q1. Resume based question
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There was one GD round on PROS and CONS of a distributed system.

Q1. The discussions were mainly on the System Design and SQL Scenarios.
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