Top AWS Interview Questions and Answers – Choose Your Path
1. Best AWS Interview Questions and Answers
In our last tutorial, we studied AWS Interview Questions and Answers Part – I, Part – II, and Part – III. Today, we will discuss some frequently asked AWS Interview Questions and Answers will help to crack the AWS interview process.
Let’s revise What is Amazon Web Service.
2. Frequently Asked AWS Interview Questions and Answers
Q.1 How do I specify that supported DB engine version I would like the DB instance to run?
Answer- The user can specify any supported version which is available at present (major and minor) once making a replacement DB instance via the Launch DB Instance operation within the AWS Management Console or the Create DB Instance API. Please note that not each info engine version is out there in each AWS region.
Q.2 How are reserved instances totally different from on-demand dB instances?
Answer- Functionally, reserved instances and on-demand dB instances are precisely the same. The sole distinction is how the user dB instance(s) are billed: With Reserved Instances. The user get a 1 or 3-year reservation and reciprocally to receive a lower effective hourly usage rate for the period of the term. Unless the user gets reserve instances during a Region. All dB instances are going to beak at on-demand hourly rates.
Q.3 How do I get and make reserved instances?
Answer- The user can purchase a reserved instance within the “Reserved Instance” section of the AWS Management Console for Amazon RDS. Instead, the user will be able to use the Amazon RDS API or AWS statement Interface to list the reservations offered for purchase then purchase a dB instance reservation.
Once the user has created a reserved purchase, employing a reserved dB instance is totally different than an On-Demand dB instance. Launch a dB instance using a similar instance category, engine and region that the user created the reservation. As long as the user reservation purchase is active. Amazon RDS can apply the reduced hourly rate that the user is eligible to the new dB instance.
Q.4 Do reserved instances embody a capability reservation?
Answer- Amazon RDS reserved instances are purchased for a region instead of for a selected accessibility Zone. As RIs aren’t specific to associate accessibility Zone, they’re not capability reservations. This suggests that though capability is pro-scribed in one accessibility Zone. Reservations will still purchas within the Region and therefore the discount can apply to match usage in any accessibility Zone at intervals that Region.
Q.5 How many reserved instances am I able to purchase?
Answer- The user can purchase up to forty reserved dB instances. If the user would like to run quite forty dB instances, please complete the Amazon RDS dB Instance request type.
Q.6 What if I even have associate existing dB instance that I’d wish to cover with a reserved instance?
Answer- Simply purchase a dB instance reservation with a similar dB instance category, DB engine, Multi-AZ possibility and License Model at intervals a similar region because the dB instance the user is presently running and would really like to order. If the reservation purchase is thriving, Amazon RDS can automatically apply the user new hourly usage charge to the user existing dB instance.
Q.7 If I sign in for a reserved instance when will the term begin? What happens to the dB instance when the term ends?
Answer- Pricing changes related to a reserved instance are activated once the user request is received whereas the payment authorization is processed. The user will be able to follow the standing of the user reservation on the AWS Account Activity page or by mistreatment the DescribeReservedDBInstances API or describe-reserved-db-instances command. If the one-time payment cannot with success approve by ensuing asking amount, the discounted worth won’t become.
When the user reservation term expires, the user reserved instance can revert to the acceptable On-Demand hourly usage rate for the user dB instance category and Region.
Q.8 How do I manage that dB instances billed at the reserved instance rate?
Answer- The Amazon RDS operations for making, modifying, and deleting dB instances don’t distinguish between on-Demand and reserved instances. Once computing the user bill, our system can automatically apply the user Reservation(s) such all eligible dB instances are charged at the lower hourly reserved dB instance rate.
2. Senerio-Based AWS Interview Questions and Answers
Q.9 How can a user move the existing DB instances outside VPC into the VPC?
Answer- If the user DB instance isn’t in a very VPC, the user will be able to use the AWS Management Console to simply move the user dB instance into a VPC. See the Amazon RDS User Guide for additional details. The user will be able to conjointly take a photo of the user DB Instance outside VPC and restore it to VPC by specifying the db Subnet cluster the user would like to use. Or else, the user will be able to perform a “Restore to purpose in Time” operation likewise.
Q.10 How will a person move the existing dB instances from within VPC to outside VPC?
Answer- Migration of dB Instances from within to outside VPC isn’t supported. For security reasons, a dB photo of a dB Instance within VPC can’t repair to outside VPC. A similar is true with “Restore to purpose in Time” practicality.
Q.11 What precautions ought to I desire to make sure that the dB Instances in VPC are accessible by the application?
Answer- The user is responsible for modifying routing tables and networking ACLs in the user VPC to confirm that the user dB instance is approachable from the user shopper instances within the VPC.
For Multi-AZ deployments, once a failover, the user shopper EC2 instance and RDS dB Instance could also be in several handiness Zones. The user must piece the user networking ACLs to confirm that cross-AZ communication is feasible.
Q.12 How can a user modify the dB Subnet cluster of the dB Instance?
Answer- An existing dB Subnet cluster will update to feature additional subnets, either for existing handiness Zones or for brand new handiness Zones additional since the creation of the dB Instance. Removing subnets from associate existing dB Subnet cluster will cause inconvenience for instances if they’re running in a very explicit AZ that gets aloof from the subnet cluster. Read the Amazon RDS User Guide for additional info.
Q.13 What is enhanced monitoring for RDS?
Answer- Enhanced monitoring for RDS provides you deeper visibility into the health of your RDS instances. simply activate the “Enhanced monitoring” possibility for your RDS dB Instance and set a coarseness and increased Monitoring can collect very important OS metrics and method info, at the defined granularity.
Q.14 What metrics and processes am I able to monitor in enhanced Monitoring?
Answer- Enhanced monitoring captures your RDS instance system level metrics like the C.P.U., memory, classification system and disk I/O among others. The entire list of metrics is often found here.
Q.15 Which engines support by enhanced Monitoring?
Answer- Enhanced monitoring supports all RDS information engines.
Q.16 Which instance varieties support by enhanced Monitoring?
Answer- Enhanced monitoring supports each instance kind except t1.micro and m1.small. The software uses a small quantity of C.P.U., memory and I/O and for general purpose monitoring. We have a tendency to suggest a change on higher granularities for instances that are medium or larger. For non-production dB Instances, the default setting for enhanced monitoring is “off”. You have got the selection of departure it disabled or modifying the coarseness once it’s on.
4. Latest AWS Interview Questions and Answers
Q.17 What info am I able to read on the RDS dashboard?
Answer- You can read all the system metrics and method info for your RDS dB Instances in a very graphical format on the console. You’ll manage that metrics you would like to observe for every instance and customize the dashboard in step with your needs
Q.18 Can all the instances in my RDS account sample metrics at an equivalent granularity?
Answer- No. you’ll set totally different granularities for every dB Instance in your RDS account. You’ll additionally opt for the instances on that you would like to modify enhanced monitoring moreover as modify the granularity of any instance whenever you would like.
Q.19 How far back am I able to see the historical metrics on the RDS console?
Answer- You can see the performance values for all the metrics for up to one hour past, at a granularity of up to one second supported your setting.
Q.20 How am I able to visualize the metrics generated by RDS enhanced monitoring in CloudWatch?
Answer- The metrics from RDS enhanced monitoring deliver into your CloudWatch Logs account. You’ll produce metrics filters in CloudWatch from CloudWatch Logs and show the graphs on the CloudWatch dashboard. For a lot of details, please visit the Amazon CloudWatch page.
Q.21 When should I use CloudWatch rather than the RDS console dashboard?
Answer- You should use CloudWatch if you would like to look at historical data on the far side what’s accessible on the RDS console dashboard. You’ll monitor your RDS instances in CloudWatch to diagnose the health of your entire AWS stack in a very single location. Currently, CloudWatch supports granularities of up to one minute. The values are going to average out for granularities but that.
Q.22 How can a user set up alarms and notifications based on specific metrics?
Answer- Yes. You’ll produce an alarm in CloudWatch that sends a notification once the alarm changes state. The alarm watches one metric over a period of time that you simply specify. It performs one or a lot of actions supported the worth of the metric relative to the required threshold over the variety of your time periods. For a lot of details on CloudWatch alarms, please visit the Amazon CloudWatch Developer Guide.
Q.23 How do I integrate enhanced monitoring with my tool that I presently use?
Answer- RDS enhance monitoring provides a collection of metrics shaped as JSON payloads that deliver into your CloudWatch Logs account. The JSON payloads deliver at the coarseness last designed for the RDS instance.
There are 2 ways that you’ll consume the metrics via a third-party dashboard or application. Monitoring tools will use CloudWatch Logs Subscriptions to line up a close to real-time feed for the metrics. As an alternative, you’ll use filters in CloudWatch Logs to bridge metrics across to CloudWatch to and integrate your application with CloudWatch. Please visit Amazon CloudWatch Documentation for a lot of details.
Q.24 How am I able to delete historical data?
Answer- Since enhanced monitoring delivers JSON payloads into a log in your CloudWatch Logs account. You’ll management its retention amount similar to the other CloudWatch Logs stream. The default retention amount designed for enhanced monitoring in CloudWatch Logs is thirty days. For details on a way to amendment retention settings, please visit Amazon CloudWatch Developer Guide.
Q.25 How can a user scale the DB instance beyond the largest DB instance class and maximum storage capacity?
Answer- There are many DB instances and classes which supports by the Amazon RDS to meet the different requirements of the applications. For spreading the data across multiple DB instances the user can implement partitioning. This is done when the application needs more computing resources than the largest DB instance class or more storage than the maximum allocation.
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