Hubilo Softech SDE-2 Interview Questions and Answers

Event loop is a mechanism in JavaScript that allows asynchronous code to be executed.

• Event loop continuously checks the call stack and the task queue.

• If the call stack is empty, it takes the first task from the queue and pushes it to the call stack.

• If the task is an asynchronous operation, it is pushed to the Web API and a callback function is registered.

• Once the operation is complete, the callback function is pushed t...read more

Connection pooling is a technique used to improve performance and scalability of database applications.

• Connection pooling allows multiple clients to reuse a single database connection, reducing the overhead of creating and tearing down connections.

• It helps in improving the performance of the application by reducing the time taken to establish a new connection.

• Connection pooling can be implemented at the application lev...read more

Indexing is important for efficient data retrieval. SQL databases use traditional indexing while NoSQL databases use various indexing techniques.

• SQL databases use B-tree indexing while NoSQL databases use hash-based, inverted index, or full-text search indexing

• SQL databases are better suited for structured data while NoSQL databases are better suited for unstructured or semi-structured data

• SQL databases have strict sch...read more