Interview Questions and Answers for 'At' | Search Interview Question

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Q1021. How would you securely migrate a database to RDS?

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Q1022. Are CloudWatch metrics available with free tier ?

Amazon Web Services (AWS)

Ans. Only Basic not advanced

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Q1023. What are the Default metrics available for EC2 in CloudWatch ?

Amazon Web Services (AWS)

Ans. CPU, Disk, Network, Status

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Q1024. How frequently Cloudwatch monitor AWS services for generating metrics ?

Amazon Web Services (AWS)

Ans. 5 mins for Standard / Basic
1 min for Detailed / advanced

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Q1025. Difference between CloudWatch and CloudTrail ?

Amazon Web Services (AWS)

Ans. CloudWatch is for monitoring resources whereas CloudTrail is for auditing activity.

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Q1026. What are inline functions ?

Programming Language

Ans. Inline functions , just like C++ Macros is an optimized technique used by compiler to reduce the execution time. If the function is working on pre identified values ( which aren't resolved at runtime ), the function can execute the method and evaluate the outcome at compile time only instead of making a function call at runtime.

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Q1027. Difference between Route53 aliasis and cname ?

Amazon Web Services (AWS)

Ans. Cname doesn't support naked domain names whereas aliasis does.

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Q1028. Difference between multi AZ RDS and Read replicas ?

Amazon Web Services (AWS)

Ans. Multi AZ RDS is for disaster recovery and failover whereas Read replicas are for scaling.

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Q1029. What is the limit of read replicas per database ?

Amazon Web Services (AWS)

Ans. 5

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Q1030. What is the ideal use case for DynamoDB ?

Amazon Web Services (AWS)

Ans. Fast reads
Much more reads than writes

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Q1031. What are the factors on which RedShift is priced on ?

Amazon Web Services (AWS)

Ans. Compute Node Hours
Backup
Data Transfer

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Q1032. Can you explain what are NAT instances and what are they used for ?

Amazon Web Services (AWS)

Ans. If instances in private subnet need to access internet without exposing the IP address to outside world , we use Nat gateway or nat instance. So there is a direct outbound traffic but not direct inbound traffic.

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Q1033. create an SQL query across multiple tables involving outer joins

Database

Ans. Select * from table1 t1Left outer join table2 t2 on t1.tid = t2.id

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Q1034. Why should we disable source / destination check for NAT Gateway ?

Amazon Web Services (AWS)

Ans. Source / destination check means that the instance should wither be a source or end destination as a security check. The purpose of NAT Instance is to provide a gateway for internet access and hence this needs to be unchecked.

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Q1035. Do we need to disable source / destination check for NAT Gateway ?

Amazon Web Services (AWS)

Ans. It needs to be done for NAT Instances , not NAT gateway.

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Q1036. Can we have NAT instance in private subnet ?

Amazon Web Services (AWS)

Ans. No

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Q1037. Write a Program to print all nodes of the data structure ?

Algorithm

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Q1038. Difference between composite , primary and unique key ?

Database

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Q1039. Can we load Yaml files into AWS DynamoDB ?

Amazon Web Services (AWS)

Ans. No

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Q1040. Can we ssh into subnet without a internet gateway ?

Amazon Web Services (AWS)

Ans. No

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Q1041. Can a constructor be declared static ? Why ?

Core Java

Ans. No.

When we declare a method static, it means that "this belongs to class as whole and not particular instance". The whole purpose of constructor is to initialize a object and hence there is no sense having static constructor.

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Q1042. What is the minimum number of tables required to perform a SQL join?

Database

Ans. 1 , We can do self join

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Q1043. Implement a queue, using only stacks

Data Structure

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Q1044. How to write an iterator for an iterator of iterators?

Core Java

Ans. CustomArrayList myarrayList = new CustomArrayList();
      myarrayList.add("Value 1");
      myarrayList.add("Value 2");
      myarrayList.add("Value 3");

      for (String string : myarrayList) {
         System.out.println(string);
      }

package sample.utils;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

public class CustomArrayList implements Iterable {

   private ArrayList mylist = new ArrayList();

   public void add(T t) {
      this.mylist.add(t);
   }

   @Override
   public Iterator iterator() {
      return new CustomIterator(mylist);
   }

   class CustomIterator implements Iterator {

      private int indexPosition = 0;
      private List internalList;

      public CustomIterator(List internalList) {
         this.internalList = internalList;
      }

      @Override
      public boolean hasNext() {
         if (internalList.size() >= indexPosition 1) {
            return true;
         }
         return false;
      }

      @Override
      public E next() {
         E val = internalList.get(indexPosition);
         indexPosition ;
         return val;
      }

   }

}

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Q1045. How many heaps will be there with 3 threads ?

Core Java

Ans. All threads share a common heap.

Each thread has a private stack, which it can quickly add and remove items from. This makes stack based memory fast, but if you use too much stack memory, as occurs in infinite recursion, you will get a stack overflow.

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Q1046. Explain when you would decide to use open authentication ?

Authentication

Ans. Google OAuth can be used when we want to grant the access of our google credentials to the service provider ( most likely a cloud-based mobile application) by using the option ' Login via Google'

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Q1047. Why Hadoop serialized data types are not using in Spark serialization ?

BigData

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Q1048. Is HashMap Synchronized ?

Core Java

Ans. No HashMap isn't synchronized. ConcurrentHashMap and Hashtable are synchronized.

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Q1049. Sort an Employee Object based on Name or Age

Database

Ans. Use Comparable or Comparator interface

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Q1050. What is cluster ?

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