10+ Datawrkz Interview Questions and Answers

Automate image version iteration by using CI/CD pipelines and version control systems.

• Use CI/CD pipelines to automatically build and deploy new versions of the image

• Integrate version control systems like Git to manage image versions

• Utilize tools like Jenkins, GitLab CI/CD, or CircleCI for automation

• Implement versioning schemes like semantic versioning (e.g. 1.0.0, 1.0.1, 1.1.0)

Yes, Jenkins can be integrated with Jira to automate ticket creation for the developer team.

• Install the Jenkins Jira plugin to enable integration

• Configure the plugin with Jira server details and credentials

• Set up a Jenkins job to trigger ticket creation in Jira upon certain events

• Use Jira REST API to interact with Jira from Jenkins job

VPC communication can be achieved by setting up VPC peering, VPN connections, or using AWS Transit Gateway.

• Set up VPC peering to allow communication between VPCs within the same region.

• Establish VPN connections to securely connect VPCs across different regions or with on-premises networks.

• Utilize AWS Transit Gateway to simplify network connectivity and enable communication between multiple VPCs and on-premises networks.

• Ensure proper routing configurations and security group r...read more

useMemo is used to memoize a value, while useCallback is used to memoize a function.

• useMemo is used to optimize expensive calculations by caching the result

• useCallback is used to optimize the performance of child components by preventing unnecessary re-rendering

• useMemo returns a memoized value, while useCallback returns a memoized function

• Both hooks take a dependency array to determine when to recalculate the memoized value or function

Metadata provides additional information about the code, such as author, version, and purpose.

• Metadata can include information like author name, creation date, last modified date, version number, and purpose of the code.

• Annotations in Java can be used to add metadata to classes, methods, and fields.

• Metadata can help other developers understand the code better and make maintenance easier.

• Examples of metadata in Java include @Override, @Deprecated, and @SuppressWarnings annotat...read more

Isolation for database can be achieved through proper configuration and access control.

• Use separate database instances for different applications or environments

• Implement role-based access control to restrict access to sensitive data

• Utilize virtualization or containerization to isolate databases

• Encrypt data at rest and in transit to protect against unauthorized access

I monitor applications using a combination of monitoring tools, logs, and performance metrics.

• Utilize monitoring tools like Nagios, Prometheus, or Datadog to track application performance and availability

• Set up alerts for critical issues or performance degradation

• Analyze logs for errors and exceptions to troubleshoot issues

• Monitor key performance metrics such as response time, CPU usage, and memory usage

• Implement APM (Application Performance Monitoring) tools like New Relic o...read more

Hibernate query is object-oriented, while native query is SQL-based.

• Hibernate query is written in HQL (Hibernate Query Language) which is object-oriented and works with Java objects.

• Native query is written in SQL and directly interacts with the database tables.

• Hibernate query is more portable and can be easily switched between different database systems.

• Native query can be more efficient for complex queries or when performance is critical.

• Hibernate query provides better abstr...read more

Spring bean is a Java object managed by the Spring IoC container.

• Java object managed by Spring IoC container

• Configured in Spring configuration file

• Can be singleton or prototype scoped

A Dockerfile is a text document that contains all the commands a user could call on the command line to assemble an image.

• Start with a base image using the FROM keyword

• Use the RUN keyword to execute commands in the image

• Use the COPY or ADD keyword to add files from the host machine to the image

• Use the CMD keyword to specify the default command to run when the container starts

Annotations in Spring are used to provide metadata about the application's components.

• Annotations are used to configure Spring beans, controllers, services, repositories, etc.

• They help in reducing the configuration overhead by providing metadata directly in the code.

• Examples include @Component, @Controller, @Service, @Repository, @Autowired, @RequestMapping, etc.

Inner join is used to combine rows from two or more tables based on a related column between them.

• Inner join returns only the rows that have matching values in both tables.

• It is commonly used in SQL queries to retrieve data from multiple tables based on a related column.

• Example: SELECT * FROM table1 INNER JOIN table2 ON table1.column = table2.column;

Program to compare elements between two arrays of strings.

• Iterate through each element in both arrays and compare them one by one.

• Use a loop to compare elements at corresponding indexes in both arrays.

• Return true if all elements match, false otherwise.

CICD flow is a process that automates the building, testing, and deployment of code changes.

• Continuous Integration (CI) - Developers regularly merge their code changes into a shared repository.

• Automated Testing - Automated tests are run to ensure code quality and functionality.

• Continuous Deployment (CD) - Code changes that pass testing are automatically deployed to production.

• Monitoring and Feedback - Continuous monitoring and feedback loops help improve the process over time...read more

The output will be '10' as the value of x is incremented after the function call.

• The value of x is initially 9.

• The function call increments the value of x by 1.

• The final value of x is 10, which is printed.

Strings are immutable in order to ensure data integrity and security.

• Immutable strings prevent accidental changes to data.

• Immutable strings allow for safe sharing of data between different parts of a program.

• Immutable strings help in multithreading environments by avoiding race conditions.

• Example: String str = "hello"; str.concat(" world"); // This will create a new string instead of modifying the original one.

Python has several built-in data types including int, float, str, list, tuple, dict, set, and bool.

• int: whole numbers, e.g. 5

• float: decimal numbers, e.g. 3.14

• str: text, e.g. 'hello'

• list: ordered collection, e.g. [1, 2, 3]

• tuple: immutable collection, e.g. (1, 2, 3)

• dict: key-value pairs, e.g. {'key': 'value'}

• set: unordered collection of unique elements, e.g. {1, 2, 3}

• bool: True or False values