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10+ Expeditors International Interview Questions and Answers

Updated 10 Nov 2024

Q1. What are the types of state management in react?

Ans.

Types of state management in React include local state, props, context API, Redux, and MobX.

  • Local state: State managed within a component using useState hook.

  • Props: Data passed from parent to child components.

  • Context API: Allows sharing state across multiple components without prop drilling.

  • Redux: External state management library for managing complex state in large applications.

  • MobX: Another external state management library that uses observables to manage state.

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Q2. What are HTML and CSS?

Ans.

HTML and CSS are languages used for creating and styling web pages.

  • HTML stands for HyperText Markup Language and is used for creating the structure of a web page.

  • CSS stands for Cascading Style Sheets and is used for styling the elements on a web page.

  • HTML uses tags to define different elements like headings, paragraphs, images, and links.

  • CSS allows for customization of colors, fonts, layouts, and other visual aspects of a web page.

  • Both HTML and CSS are essential for web devel...read more

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Q3. What is prop drilling?

Ans.

Prop drilling is the process of passing down props from a parent component to nested child components, even if the intermediate components do not use the props.

  • Prop drilling can lead to unnecessary passing of props through multiple levels of components.

  • It can make the code harder to maintain and understand.

  • One way to avoid prop drilling is by using context API or state management libraries like Redux.

  • Example: Parent component passes a prop to Child component, which then passe...read more

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Q4. What is Reconcilation?

Ans.

Reconciliation is the process of comparing two sets of records to ensure they are in agreement.

  • Reconciliation involves verifying and adjusting financial transactions to ensure accuracy.

  • It is commonly used in accounting to match transactions in bank statements with internal records.

  • Reconciliation helps identify discrepancies and errors that need to be resolved.

  • Examples include reconciling credit card statements with receipts and reconciling inventory records with physical coun...read more

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Q5. What is React JS?

Ans.

React JS is a JavaScript library for building user interfaces.

  • React JS is developed and maintained by Facebook.

  • It allows developers to create reusable UI components.

  • React uses a virtual DOM for better performance.

  • It follows a component-based architecture.

  • React can be used for building single-page applications.

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Q6. Explain Redux and Context API

Ans.

Redux is a predictable state container for JavaScript apps. Context API is a way to pass data through the component tree without having to pass props down manually.

  • Redux is a state management library commonly used with React to manage application state in a predictable way.

  • Redux follows a unidirectional data flow pattern, where the state of the whole application is stored in a single store.

  • Actions are dispatched to update the state in Redux, and reducers specify how the state...read more

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Q7. Expalin about refresh mechanism in sql

Ans.

Refresh mechanism in SQL is used to update the data in a materialized view or a snapshot to reflect changes in the base tables.

  • Refresh mechanism can be manual or automatic.

  • Manual refresh requires the user to explicitly refresh the materialized view using a command like REFRESH MATERIALIZED VIEW.

  • Automatic refresh can be set up using options like ON COMMIT or ON DEMAND.

  • Examples of automatic refresh include fast refresh and complete refresh.

  • Fast refresh updates only the changed ...read more

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Q8. Explain about performance tuning

Ans.

Performance tuning involves optimizing the speed and efficiency of a system or application.

  • Identifying and resolving bottlenecks in the system

  • Optimizing SQL queries by adding indexes, rewriting queries, or using hints

  • Tuning database parameters such as memory allocation and buffer sizes

  • Using tools like Explain Plan to analyze query performance

  • Caching frequently accessed data to reduce load on the database

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Q9. Expalin about sql loader utility

Ans.

SQL Loader is a tool provided by Oracle for loading data from external files into database tables.

  • SQL Loader is used to load data from flat files (such as CSV) into Oracle database tables.

  • It can handle large volumes of data efficiently.

  • Control files are used to specify the format of the data file and the target table columns.

  • SQL Loader can perform various data transformations during the loading process.

  • It is commonly used for bulk data loading tasks.

  • Example: sqlldr username/p...read more

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Q10. expalin about lead and lag

Ans.

Lead and Lag are analytic functions in SQL used to access data from a previous or subsequent row in a result set.

  • Lead function is used to access data from a subsequent row in the result set.

  • Lag function is used to access data from a previous row in the result set.

  • Both functions take three arguments: the column to retrieve data from, the number of rows forward or backward to look, and a default value if the offset goes beyond the bounds of the result set.

  • Example: SELECT employ...read more

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Q11. Process for new build tower installation

Ans.

The process for new build tower installation involves site survey, obtaining necessary permits, tower design and construction, and equipment installation.

  • Perform a site survey to determine the best location for the tower

  • Obtain necessary permits from local authorities

  • Design and construct the tower according to specifications

  • Install necessary equipment such as antennas and cables

  • Test and commission the tower to ensure it meets required standards

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