10+ Interview Questions and Answers

I would investigate the cause of the failure and take appropriate actions to resolve it.

• Check the error logs to identify the root cause of the failure

• Determine if the issue can be resolved by restarting the batch or if a code fix is required

• Communicate the issue and resolution plan to relevant stakeholders

• Implement the fix and re-run the batch

• Perform post-mortem analysis to identify ways to prevent similar failures in the future

Serialization is the process of converting an object into a stream of bytes to store or transmit data.

• Serialization is used to save the state of an object and recreate it when needed.

• In Java, serialization is achieved by implementing the Serializable interface.

• Example: ObjectOutputStream and ObjectInputStream classes are used for serialization in Java.

Left outer join is a type of join operation that returns all records from the left table and the matched records from the right table.

• Left outer join combines rows from two tables based on a related column between them.

• It includes all the rows from the left table, even if there are no matches in the right table.

• Example: SELECT * FROM table1 LEFT JOIN table2 ON table1.id = table2.id;

Normalization is the process of organizing data in a database to reduce redundancy and improve data integrity.

• Normalization involves breaking down data into smaller, more manageable tables

• It helps in reducing data redundancy by eliminating duplicate data

• Normalization improves data integrity by ensuring that each piece of data is stored in only one place

• There are different levels of normalization, such as First Normal Form (1NF), Second Normal Form (2NF), and Third Normal Form...read more

Joins are used in databases to combine rows from two or more tables based on a related column between them.

• Joins are used to retrieve data from multiple tables based on a related column.

• Common types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN.

• INNER JOIN returns rows when there is at least one match in both tables.

• LEFT JOIN returns all rows from the left table and the matched rows from the right table.

• RIGHT JOIN returns all rows from the right table and t...read more

I have worked with various tools including Java, Python, SQL, Git, and JIRA.

• Proficient in Java programming language

• Experience with Python scripting

• Skilled in writing SQL queries

• Familiar with Git version control system

• Knowledgeable in using JIRA for project management

DI and IoC are design patterns used in Spring Boot to achieve loose coupling and improve testability.

• DI (Dependency Injection) is a design pattern where the dependencies of a class are injected from the outside rather than created within the class itself.

• IoC (Inversion of Control) is a design principle where the control of object creation and lifecycle is inverted from the class to an external entity.

• Spring Boot uses DI and IoC to manage dependencies and improve modularity an...read more

A constraint is a rule or limitation that must be followed in a system or process.

• Constraints restrict the actions or behaviors of users or systems.

• Constraints can be related to data validation, business rules, or system limitations.

• Examples of constraints include password length requirements, maximum file size limits, and budget constraints.

A sub-query is a query nested within another query in SQL to retrieve data from multiple tables.

• Used to retrieve data from multiple tables

• Can be used in SELECT, INSERT, UPDATE, or DELETE statements

• Must be enclosed in parentheses