EPAM Systems Software Tester Interview Questions and Answers

A linked list is a linear data structure where each element is a separate object with a pointer to the next element.

• In Java, a linked list is implemented using the LinkedList class in the java.util package.

• LinkedList class provides methods like add(), remove(), get(), etc. to manipulate the list.

• Each element in the list is represented by a node object which contains the data and a reference to the next node.

• Linked list...read more

ACID Properties are a set of properties that ensure database transactions are processed reliably.

• ACID stands for Atomicity, Consistency, Isolation, and Durability.

• Atomicity ensures that a transaction is treated as a single, indivisible unit of work.

• Consistency ensures that a transaction brings the database from one valid state to another.

• Isolation ensures that concurrent transactions do not interfere with each other.

• Du...read more

A deadlock is a situation where two or more processes are unable to proceed due to a circular dependency.

• Deadlock occurs when two or more processes are waiting for each other to release resources.

• To avoid deadlock, use techniques like resource allocation graph, banker's algorithm, and deadlock prevention.

• Resource allocation graph is a visual representation of resource allocation and can help identify potential deadlock...read more

SQL is a relational database while NoSQL is non-relational. MongoDB is preferred for scalability and flexibility.

• SQL is table-based while NoSQL is document-based

• SQL is structured while NoSQL is unstructured

• SQL is vertically scalable while NoSQL is horizontally scalable

• MongoDB is preferred for its ability to handle large amounts of unstructured data and its flexibility in schema design

• MySQL is preferred for its strong A...read more