ServiceNow Interview Questions, Process, and Tips

Q1. Focus on coding, Question: find the duplicate string from list of string and the count of it(how many times it is repeated) Prepare oops and collections concepts.
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Q2. Focus on method overriding
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Q3. Difference between arraylist and LinkedInlist
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ArrayList is a resizable array implementation while LinkedList is a doubly linked list implementation.
• ArrayList uses dynamic arrays to store elements, allowing fast random access but slower insertion and deletion.

• LinkedList uses nodes with pointers to the next and previous elements, allowing fast insertion and deletion but slower random access.

• Example: ArrayList - List names = new ArrayList<>(); LinkedList - List citie
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Q4. Use of static keyword
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The static keyword in programming is used to declare variables, methods, or classes that belong to the class itself rather than instances of the class.
• Static variables are shared among all instances of a class.

• Static methods can be called without creating an instance of the class.

• Static classes cannot be instantiated and are used for grouping related methods and variables.

• Example: public static int count = 0; // static
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Q1. About projects and then questions related to ML and DL. Mostly focused on DL part
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Q2. What is the difference between Adam optimizer and Gradient Descent Optimizer?
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Adam optimizer is an extension to the Gradient Descent optimizer with adaptive learning rates and momentum.
• Adam optimizer combines the benefits of both AdaGrad and RMSProp optimizers.

• Adam optimizer uses adaptive learning rates for each parameter.

• Gradient Descent optimizer has a fixed learning rate for all parameters.

• Adam optimizer includes momentum to speed up convergence.

• Gradient Descent optimizer updates parameters b...read more
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Q3. When to use Relu and when not?
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Use ReLU for hidden layers in deep neural networks, avoid for output layers.
• ReLU is commonly used in hidden layers to introduce non-linearity and speed up convergence.

• Avoid using ReLU in output layers for regression tasks as it can lead to vanishing gradients.

• Consider using Leaky ReLU or Sigmoid for output layers depending on the task.

• ReLU is computationally efficient and helps in preventing the vanishing gradient prob...read more
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Q1. What is shell in linux?
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Shell in Linux is a command-line interpreter that allows users to interact with the operating system by executing commands.
• Shell is a program that takes commands from the keyboard and gives them to the operating system to perform.

• It can also be used to automate tasks by writing scripts.

• Common shells in Linux include Bash, Zsh, and Ksh.

• Shell scripting allows users to write programs that can be executed by the shell.

• Exam...read more
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Q2. What are the different types of joins
Ans. 
Different types of joins include inner join, outer join, left join, and right join.
• Inner join: Returns rows when there is a match in both tables

• Outer join: Returns all rows when there is a match in one of the 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 the matched rows from the left table
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Q1. How to tune a sql query?
Ans. 
Tuning a SQL query involves optimizing its performance by adjusting various factors.
• Identify slow-performing queries using tools like SQL Profiler or Execution Plan.

• Optimize query structure by using appropriate indexes and avoiding unnecessary joins.

• Consider rewriting the query to use more efficient techniques like subqueries or CTEs.

• Update statistics and ensure database indexes are up to date.

• Limit the number of rows ...read more
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Q2. How to find errors in log files in linux
Ans. 
Errors in log files in Linux can be found by searching for keywords, timestamps, and error codes.
• Use 'grep' command to search for specific keywords or error codes in log files

• Look for timestamps to identify when errors occurred

• Check for any error messages or warnings that may indicate issues

• Use 'tail' command to view the end of log files for recent errors

• Consider using 'journalctl' command for system logs in systemd-ba
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Q1. What is shell in linux
Ans. 
Shell in Linux is a command-line interpreter that allows users to interact with the operating system by executing commands.
• Shell is a program that takes commands from the keyboard and gives them to the operating system to perform.

• It can also be used to automate tasks by writing scripts.

• Common shells in Linux include Bash, Zsh, and Ksh.

• Examples of shell commands include ls (list files), cd (change directory), and mkdir
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Q2. What are the different types of joins
Ans. 
Different types of joins include inner join, outer join, left join, and right join.
• Inner join: Returns rows when there is a match in both tables

• Outer join: Returns all rows when there is a match in one of the 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 the matched rows from the left table
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Q1. How to tune a sql query?
Ans. 
Tuning a SQL query involves optimizing its performance by adjusting various factors.
• Identify slow performing queries using tools like SQL Profiler or Execution Plan.

• Optimize query structure by using appropriate indexes and avoiding unnecessary joins.

• Consider rewriting the query to use more efficient techniques like subqueries or CTEs.

• Update statistics on tables involved in the query to ensure accurate query execution p...read more
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Q2. How to find errors in log files in linux
Ans. 
Errors in log files in Linux can be found by searching for keywords, timestamps, and error codes.
• Use 'grep' command to search for specific keywords or error codes in log files

• Look for timestamps to identify when errors occurred

• Check for any error messages or warnings that may indicate issues

• Use 'tail' command to view the end of log files for recent errors

• Consider using 'journalctl' command for system logs in systemd-ba
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2 questions in coding assessment

Q1. Question 1, LeetCode question
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Q2. Question 2, LeetCode question
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MCQ - 40 questions - 40 mins
4 section each 10 questions
Section 1 : SQL based
Section 2 : Javascript
Section 3 : Linux/Unix fundamentals
Section 4 : Servicenow Platform

Q1. SQL - DDL,DML, and most of the questions were related to Unix commands. To explain the commands.
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Q2. Then a few questions related to ServiceNow were also asked. Like what do you know about service now, and what are some advantages of using the servicenow platform. I was asked for a detailed description of...read more
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Q3. Lastly, a scenario based question was asked where I have to deal with a troubled client. And how I would react in such a scenario. And what I would do then.
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Q1. Basic to intermediate level questions - Based on networking,javascript, operating systems and also asked about the company and the services they provide. Basic oops and coding question was given to write t...read more
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Q2. Scenario and condition based questions - 1. Situations based for eg: If a customer comes with an issue which has never been diagonized previously and there are no vlogs regarding that. What will you do?
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