Synechron Senior Software Developer Interview Questions and Answers

Cluster load balancing in Node.js helps distribute incoming requests among multiple instances of the application to improve performance and reliability.

• Cluster load balancing allows Node.js applications to utilize multiple CPU cores efficiently by creating child processes to handle incoming requests.

• It helps prevent a single instance of the application from becoming overwhelmed with requests, leading to improved performance and reliability.

• Examples of cluster load balancing t...read more

CQRS is a design pattern that separates the read and write operations of a system, using different models for each.

• CQRS separates the responsibility of handling commands (write operations) from queries (read operations).

• It helps in achieving better scalability, performance, and maintainability by using different models for reads and writes.

• For example, in a banking application, the write model may handle transactions and account updates, while the read model may handle querie...read more

Advantages of using a microservice architecture include scalability, flexibility, fault isolation, and technology diversity.

• Scalability: Microservices allow for individual components to be scaled independently, leading to better resource utilization.

• Flexibility: Each microservice can be developed, deployed, and updated independently, allowing for faster innovation and reduced time to market.

• Fault Isolation: If one microservice fails, it does not bring down the entire system, ...read more

Durability ensures that once a transaction is committed, it will persist even in the event of a system failure.

• Durability guarantees that once a transaction is committed, it will not be lost even in the event of a system crash.

• This is typically achieved through mechanisms like write-ahead logging and periodic checkpoints.

• Examples of ACID-compliant databases that ensure durability include PostgreSQL, Oracle, and SQL Server.

Transactions in a database ensure that a group of operations are completed successfully or rolled back if any part fails.

• Transactions help maintain data integrity by ensuring all changes are either committed or rolled back as a single unit.

• ACID properties (Atomicity, Consistency, Isolation, Durability) are maintained in transactions.

• Examples of transactions include transferring money between bank accounts or booking a flight ticket.

• Transactions use locks to prevent concurrent...read more

Replication in a database involves copying and distributing data across multiple servers to ensure redundancy and availability.

• Replication involves creating multiple copies of the database on different servers.

• Changes made to the primary database are then propagated to the replica databases.

• Replication can be synchronous or asynchronous, with synchronous replication ensuring data consistency but potentially impacting performance.

• Examples of database replication technologies i...read more

There are two types of pipes: named pipes and anonymous pipes.

• Named pipes are used for communication between processes on different computers or on the same computer.

• Anonymous pipes are used for communication between processes on the same computer.

• Named pipes have a unique name and can be accessed by any process that knows the name.

• Anonymous pipes are created by a process and can only be accessed by that process and its child processes.

• Both types of pipes are used for inter-p...read more