20+ Virtusa Consulting Services Technology Consultant Interview Questions and Answers

The task is to find and return all possible permutations of a given input string.

• Use recursion to generate all possible permutations of the input string.

• Swap characters in the string to generate different permutations.

• Handle duplicate characters by using a set to store unique permutations.

• Return the list of permutations as an array of strings.

Synon file types, field contexts, screen types, array purpose and deletion in Synon

• Synon file types include physical, logical, and display files

• Field contexts in functions include input, output, and both

• Types of fields in Synon include alphanumeric, numeric, and date

• Types of screens in Synon include inquiry, maintenance, and report

• Arrays in Synon are used to store multiple values of the same data type

• To delete a single record in an array, use the DELETE_ARRAY_ENTRY function

• To...read more

Set up Azure architecture for client transitioning from on-premises to cloud

• Assess current on-premises infrastructure and workloads

• Design Azure architecture based on client's requirements and goals

• Implement Azure services such as Virtual Machines, Azure Active Directory, and Azure Storage

• Set up networking and security configurations in Azure

• Migrate data and applications from on-premises to Azure using tools like Azure Site Recovery

• Optimize and monitor the Azure environment po...read more

Major differences between @RequestMapping and @GetMapping in Spring Boot

• 1. @RequestMapping is a generic annotation for mapping HTTP requests to handler methods, while @GetMapping is a specialized version that only handles GET requests.

• 2. @GetMapping is a shortcut for @RequestMapping(method = RequestMethod.GET), making it more concise and specific.

• 3. @RequestMapping allows for specifying additional parameters like headers, params, and consumes/produces, while @GetMapping is li...read more

The four core API architectures that Kafka uses are Producer API, Consumer API, Streams API, and Connector API.

• Producer API: Allows applications to publish streams of records to one or more Kafka topics.

• Consumer API: Allows applications to subscribe to topics and process the stream of records produced to them.

• Streams API: Allows creating and processing real-time data streams from one or more input topics to one or more output topics.

• Connector API: Allows building and running ...read more

The @RestController annotation in Spring Boot is used to define a class as a RESTful controller.

• Used to create RESTful web services in Spring Boot

• Combines @Controller and @ResponseBody annotations

• Eliminates the need for @ResponseBody annotation on each method

• Returns data directly in the response body as JSON or XML

Spring Boot offers annotations like @SpringBootApplication, @RestController, @Autowired, @Component, @Repository, @Service, @Configuration, @RequestMapping, etc.

• @SpringBootApplication - Used to mark the main class of a Spring Boot application

• @RestController - Used to define RESTful web services

• @Autowired - Used for automatic dependency injection

• @Component - Used to indicate a class is a Spring component

• @Repository - Used to indicate a class is a Spring repository

• @Service - Us...read more

To deploy multiple environment scripts using Terraform, you can use Terraform workspaces and variables.

• Use Terraform workspaces to manage multiple environments such as dev, staging, and production.

• Create separate Terraform configuration files for each environment, with environment-specific variables.

• Use Terraform variables to define environment-specific settings like resource names, sizes, and configurations.

• Utilize Terraform modules to reuse common configurations across diff...read more

Kafka monitoring is essential for ensuring optimal performance, detecting issues, and maintaining data integrity.

• Real-time monitoring of data ingestion and processing

• Tracking consumer lag to ensure timely data consumption

• Identifying bottlenecks and optimizing cluster performance

• Monitoring disk usage and network throughput

• Alerting on anomalies or failures for proactive troubleshooting

To create an immutable class in Hibernate, use final keyword for class, make fields private and provide only getters.

• Use the final keyword for the class to prevent subclassing

• Make fields private to restrict direct access

• Provide only getters for the fields to ensure read-only access

• Avoid providing setters or mutable methods

Query Cache in Hibernate stores the results of queries in memory to improve performance by avoiding repeated database calls.

• Query Cache is a second-level cache in Hibernate that stores the results of queries along with the query key in memory.

• It helps in improving performance by avoiding repeated database calls for the same query.

• Query Cache can be enabled in Hibernate configuration to cache query results.

• It is useful for read-heavy applications where the same queries are exe...read more

TMAP has three types of matching: exact, fuzzy, and partial. TUNITE is used for merging data from multiple sources.

• TMAP has exact, fuzzy, and partial matching options for data mapping

• Exact matching requires exact match of values in source and target

• Fuzzy matching allows for some variation in values, such as spelling errors

• Partial matching matches based on a percentage of similarity between values

• TUNITE is used for merging data from multiple sources into a single output

• TUNITE ...read more

Spring Boot is a framework that simplifies the development of Java applications by providing pre-configured settings and tools.

• Spring Boot eliminates the need for manual configuration by providing defaults for most settings.

• It includes embedded servers like Tomcat, Jetty, or Undertow, making it easy to run applications.

• Spring Boot also offers production-ready features like metrics, health checks, and externalized configuration.

• It allows developers to quickly build and deploy ...read more

Dependency injection is a design pattern where components are given their dependencies rather than creating them internally.

• Allows for easier testing by mocking dependencies

• Promotes loose coupling between components

• Improves code reusability and maintainability

• Examples: Constructor injection, Setter injection, Interface injection

Hibernate caching is a mechanism used to improve the performance of Hibernate applications by reducing the number of database queries.

• Hibernate caching stores frequently accessed data in memory to reduce the need for repeated database queries

• There are different levels of caching in Hibernate such as first-level cache and second-level cache

• First-level cache is associated with the Session object and is enabled by default

• Second-level cache is shared across multiple sessions and ...read more

tJava, tJavaFlex, and tJavaRow are components in Talend for Java programming.

• tJava is used for writing custom Java code in Talend jobs.

• tJavaFlex is used for writing complex Java code in Talend jobs.

• tJavaRow is used for writing Java code to manipulate data in Talend jobs.

• All three components require Java programming knowledge.

• Examples: tJava can be used to perform calculations, tJavaFlex can be used to create custom functions, and tJavaRow can be used to filter data.

Right outer join returns all records from the right table and matching records from the left table.

• It includes all the records from the right table and only matching records from the left table.

• If there is no match in the left table, the result will contain NULL values.

• It is denoted by RIGHT OUTER JOIN or RIGHT JOIN keyword in SQL.

• Example: SELECT * FROM right_table RIGHT JOIN left_table ON right_table.id = left_table.id;

Types in Oracle are data types that define the type of data that can be stored in a column or variable.

• Oracle has several built-in data types such as NUMBER, VARCHAR2, DATE, and CLOB.

• NUMBER is used to store numeric values, VARCHAR2 is used to store character strings, DATE is used to store dates and times, and CLOB is used to store large character strings.

• Oracle also supports user-defined data types, which can be created using the CREATE TYPE statement.

• User-defined data types ...read more

An array type is a data type that stores a collection of elements of the same data type in a contiguous memory location.

• Arrays can be one-dimensional or multi-dimensional

• Elements in an array can be accessed using an index

• Arrays can be initialized with a fixed size or dynamically resized

• Examples of array types include int[], double[], and string[]

tJava, tJavaRow, and tJavaFlex are all components in Talend that allow for custom Java code to be executed within a job.

• tJava is used to execute Java code within a job, and can be used to manipulate data or perform custom logic.

• tJavaRow is similar to tJava, but is used specifically for manipulating data row by row.

• tJavaFlex is a more advanced version of tJava that allows for more complex Java code to be executed within a job.

• All three components require knowledge of Java prog...read more