Showing posts with label EBS. Show all posts
Showing posts with label EBS. Show all posts

November 25, 2022

Top 20 AWS Neptune Interview Questions and Answers

 

 

            It is simple to create and run applications that work with densely connected datasets thanks to Amazon Neptune, a quick, dependable, and fully-managed graph database service. Highly connected data requires complicated SQL queries that are challenging to optimise for performance. Instead, you may utilise open and well-known graph query languages with Amazon Neptune to run effective queries that are simple to develop and perform well on connected data.

 

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Ques. 1): What do you know about Amazon Neptune?

The time-consuming processes like provisioning, patching, backup, recovery, failure detection, and repair are handled by Amazon Neptune, which is fully managed. For each instance of the Amazon Neptune database you use, you just pay a monthly fee. Both up-front fees and long-term commitments are not necessary.

The heart of Neptune is a purpose-built, high-performance graph database engine designed for millisecond-latency graph queries and storing billions of relationships. Neptune can be used for graph use cases like drug discovery, knowledge graphs, fraud detection, recommendation engines, and network security.

 

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Ques. 2): Is a relational database the foundation of Amazon Neptune?

Contrary to popular belief, Amazon Neptune is a high-performance graph database engine. Neptune offers a scale-up, in-memory optimised architecture to provide quick query evaluation over massive graphs and effectively stores and navigates graph data.

 

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Ques. 3): In Amazon Neptune, what are IOs and how are they calculated?

To cut expenses and make sure resources are available for serving read/write traffic, Amazon Neptune was built to do away with pointless IO activities. Only when pushing transaction log records to the storage layer in order to make writes persistent, write IOs are used. 4KB units are used to measure write IOs. One IO operation, for illustration, would be the 1024-byte transaction log record. However, in order to reduce I/O consumption, the Amazon Neptune database engine can batch together concurrent write operations whose transaction log is less than 4KB. Amazon Neptune doesn't push updated database pages to the storage layer like traditional database engines do, which reduces IO usage even further.


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Ques. 4): How can the computational resources connected to my Amazon Neptune DB Instance be scaled?

By selecting the desired DB Instance and clicking the Modify button in the AWS Management Console, you can scale the compute resources allotted to your DB Instance. You can alter memory and CPU resources by altering the class of your DB Instance.

Your desired changes will be implemented whenever you make changes to the DB Instance class during the designated maintenance window. As an alternative, you can apply your scaling requests right away by using the "Apply Immediately" parameter. For a few minutes while the scaling procedure is being carried out, each of these alternatives will have an influence on availability. Remember that this update will be applied along with any other pending system changes.


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Ques. 5): What happens if I destroy my DB Instance to my automatic backups and database snapshots?

When you delete your DB Instance, you have the option of creating a last DB Snapshot. If so, you can later on use this DB Snapshot to recover the destroyed DB Instance. After the DB Instance is removed, Amazon Neptune keeps this last manually made DB Snapshot in addition to all other manually created DB Snapshots. After deleting the DB Instance, only DB Snapshots are maintained (i.e., automated backups created for point-in-time restore are not kept).


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Ques. 6): How is the fault tolerance of my database to disc failures improved by Amazon Neptune?

Your database volume is automatically divided into 10GB parts and distributed over several discs by Amazon Neptune. Your database volume is replicated six times, over three availability zones, for each 10GB piece. Without compromising database write availability or read availability, Amazon Neptune is built to transparently withstand the loss of up to two copies of data at once. Additionally self-healing is Amazon Neptune storage. Disks and data blocks are automatically checked for faults on a constant basis.

 

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Ques. 7): How can the availability of a single Amazon Neptune database be improved?

Amazon Neptune Replicas are an option. The primary instance and Amazon Neptune Replicas share the same underlying storage. To increase fault tolerance in the event of a primary DB Instance failure, any Amazon Neptune Replica can be promoted to become primary without causing any data loss. Simply add 1 to 15 replicas to your database to boost availability, and Amazon Neptune will automatically choose them for failover main selection in the event of a database failure.


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Ques. 8): How long does failover take? What happens during failover?

Amazon Neptune handles failover automatically so that your applications can resume database operations as soon as feasible without needing to call in a manual administrator.

When failing over, Amazon Neptune flips the canonical name record (CNAME) for your database's primary endpoint to a healthy replica, which is then promoted to become the new primary, if you have an Amazon Neptune Replica in the same or a different Availability Zone. Failover normally takes 30 seconds to complete from beginning to end. Additionally, during failover, the read replicas endpoint doesn't need any CNAME modifications.

Neptune will first try to establish a new DB Instance in the same Availability Zone as the original instance if you don't already have one (i.e., a single instance). Neptune will try to build a new DB Instance in a different Availability Zone if it is unable to do so. Failover normally takes less than 15 minutes to execute from beginning to end.


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Ques. 9): Is it possible to encrypt my data both in transit and at rest using Amazon Neptune?

You may use AWS Key Management Service keys to encrypt your databases with Amazon Neptune, which also supports HTTPS encrypted client connections (KMS). Data saved at rest in the underlying storage is encrypted on a database instance operating with Amazon Neptune encryption, as are its automated backups, snapshots, and replicas in the same cluster. The processes of encryption and decryption run smoothly.

 

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Ques. 10): Can I use RDF/SPARQL and Apache TinkerPop Gremlin on the same Neptune instance?

Yes, each Neptune instance offers both a SPARQL 1.1 Protocol REST endpoint and a Gremlin Websocket Server. Since the data is divided between the stacks, neither Gremlin nor RDF traversals are possible. This is meant to provide you the opportunity to try them out and evaluate which one works best for your application. Due to the shared nature of the resources on a single instance in production, Amazon advises clients to limit their access to an instance to either Gremlin or SPARQL.

 

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Ques. 11): Why is Amazon Neptune required to use Amazon RDS resources and permissions?

An efficient, high-performance graph database engine is called Amazon Neptune. Neptune makes use of operational technology that is shared with Amazon RDS for a few administration functions, including instance lifecycle management, encryption-at-rest with Amazon Key Management Service (KMS) keys, and security groups management.

 

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Ques. 12): What would be my recovery strategy if my database crashed?

In addition to automatically attempting to recover your database in a sound Availability Zone with no data loss, Amazon Neptune keeps 6 copies of your data across 3 Availability Zones. In the odd event that your data is not available in Amazon Neptune storage, you can perform a point-in-time restoration operation to a new instance or restore from a DB snapshot. It should be noted that a point-in-time restoration operation's latest restorable time can be up to 5 minutes in the past.

 

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Ques. 13): My photos can I share with another AWS account?

Yes. You can take database snapshots with Neptune that you can subsequently utilise to restore a database from. AWS accounts can be shared, and the owner of the receiving account can utilise the shared snapshot to restore a database that contains your data. Anybody can restore a database containing your (public) data if you decide to make your snapshots public. This functionality allows you to securely store backups of all your data in a second account in case your primary AWS account is ever compromised, communicate data between your multiple environments (production, dev/test, staging, etc.) that each have their own AWS accounts, and more.

 

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Ques. 14): How does Amazon Neptune speed up database recovery time?

Unlike other databases, Amazon Neptune does not need to replay the redo log from the most recent database checkpoint, which generally takes place after 5 minutes, to ensure that all changes have been made before rendering the database usable for operations following a database crash. In most cases, this cuts down database restart times to under 60 seconds. When the database process is restarted, Amazon Neptune removes the buffer cache and makes it immediately accessible. This saves you from having to restrict access while the cache is being refilled in order to prevent brownouts.

 

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Ques. 15): Is it possible to choose some replicas as failover targets before others?

Yes. Each instance in your cluster might have a different promotion priority tier assigned to it. Amazon Neptune will upgrade the replica with the highest priority to the primary instance if the primary instance fails. The replica that is the same size as the primary instance will be promoted if there is a tie between two or more replicas in the same priority tier.

 

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Ques. 16): What happens if a failover occurs while I have a primary database and an Amazon Neptune Replica actively handling read traffic?

If there is an issue with your primary instance, Amazon Neptune will immediately identify it and start redirecting your read/write traffic to an Amazon Neptune Replica. This failover will typically be finished in 30 seconds. Your Amazon Neptune Replicas' read traffic will also experience a brief interruption.

 

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Ques. 17): Which well-known query languages for graphs does Amazon Neptune support?

Both the W3C standard Resource Description Framework (RDF) SPARQL query language and the open source Apache TinkerPop Gremlin graph traversal language are supported by Amazon Neptune.

 

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Ques. 18): How can I switch from an Amazon Neptune triple store with a SPARQL endpoint?

An HTTP REST endpoint that uses the SPARQL 1.1 Protocol is made available by Amazon Neptune. You can set up your application to point to the SPARQL endpoint after creating a service instance. See also SPARQL Access to the Graph.

 

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Ques. 19): What is an Amazon Neptune database's minimum and maximum storage capacity?

Storage must be at least 10GB. Your Amazon Neptune storage will automatically increase, up to 64 TB, in 10GB increments based on your database usage, without affecting database performance. Provisioning storage in advance is not necessary.

 

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Ques. 20): Is it possible for me to stop some copies from becoming the primary instance?

Replicas that you don't want promoted to the primary instance might be given lower priority tiers. However, Amazon Neptune will advance the lower priority replica if the cluster's higher priority replicas are ill or unavailable for some other reason.

 


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Top 20 AWS PinPoint Questions and Answers

 

 

Top 20 AWS PinPoint Questions and Answers

 


Additionally, you can use Amazon Pinpoint to develop campaigns that notify your users via emails, text messages, push notifications, in-app messaging, and other means when they do particular activities within your apps. Creating a welcome email to send to customers who create profiles is one example. Using the Amazon Pinpoint console or the Amazon Pinpoint API, you may build event-based campaigns. Both transactional and targeted marketing use cases can be implemented well with event-based campaigns. You choose certain events, traits, and metric values that you wish to use to activate your campaigns rather than specifying a time to send your message to clients.

You can decide when the campaign should be sent while setting up the campaign in Amazon Pinpoint. You have two choices: either send the campaign at a particular time or send it when an event takes place. Period-based campaigns can be planned to run once right away or at a specific time in the future. Hourly, daily, weekly, or monthly runs can also be planned for them. To establish your recurring campaigns, pick a start date, an end date, and decide whether or not to base message delivery on the time zone of each recipient.

 

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Ques. 1): How can I manage and conduct my campaigns using Amazon Pinpoint?

Answer:

Running targeted campaigns and promoting consumer communications across various channels, such as email, SMS, push notifications, in-app messaging, or custom channels, is simple with Amazon Pinpoint. You may specify which people to target with Amazon Pinpoint campaigns, choose the messages to send, set the optimal time for the messages to be sent, and then monitor the campaign's progress.

Because Amazon Pinpoint is designed to scale, you can use it to gather and process billions of events daily and send billions of user-specific messages.

 

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Ques. 2): How are campaign limitations implemented?

Answer:

You may define the maximum amount of messages an endpoint can receive for a campaign on the General Settings page of the Amazon Pinpoint console or in the campaign settings. When you wish to impose severe restrictions on the number of messages an endpoint can receive at any given time, this functionality can be helpful. You can set the limit to 1 if, for instance, you develop a campaign that is automatically distributed to all new clients. The message will only be sent to new clients once thanks to this setting.

The number of messages that target an endpoint, as opposed to the number of messages that are actually delivered to an endpoint, is what determines how effective this feature is. The endpoint is still considered to have been targeted even if a campaign is set up to automatically send a message when a client establishes a new account but the endpoint is unable to receive the message for whatever reason (for instance, if your campaign's quiet time option applies to the endpoint). In this case, the endpoint is dropped from all campaign runs going forward until the limit period has passed.

 

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Ques. 3): How can Amazon Pinpoint be used by developers?

Answer:

A single API layer, CLI support, and client-side SDK support are all provided by Amazon Pinpoint to developers so they can increase the number of communication channels available to users of their applications. Email, SMS text messaging, push alerts, voice messages, and custom channels are a few of these channels. Additionally, Amazon Pinpoint offers developers access to an analytics platform that monitors app user engagement and activity. With the use of this service, developers can discover the preferred methods of interaction from each user and tailor the end-user experience to boost the utility of their applications.

Several messaging use cases, including direct or transactional messaging, targeted or campaign messaging, and event-based messaging, are also assisted by Amazon Pinpoint for developers.


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Ques. 4): What are campaigns based on events?

Answer:

When your consumers complete certain activities within your applications, such making purchases or watching videos, event-based campaigns send them messages via text, push notifications, in-app messaging, and emails. For instance, you may configure a campaign to send a message when a customer registers for an account or adds something to their basket but later decides not to buy it. Using the Amazon Pinpoint console or the Amazon Pinpoint API, you may build event-based campaigns. Both transactional use cases, like one-time passwords and order confirmation messages, and targeted use cases, like marketing promotions, can be implemented successfully using event-based campaigns. Rather than define a time to send your message to customers, you select specific events, attributes, and metric values that you want to use to trigger your campaigns. 


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Ques. 5): What advantages do custom events offer?

Answer:

You may learn more about user behaviour in your app by using custom events. For instance, a game designer would be interested in knowing how frequently a level is finished as well as how much health each player has left after finishing a level. You can build a custom event called "level complete" that has the attributes "add level" and "health" as its value. You can log a "level complete" event each time a level is finished, along with the level's name and the player's health. You could find that a level is too simple by looking at the events charts because everyone always completes with maximum health. Using this data, you can adjust the level's difficulty to better challenge and engage players, which might improve retention.

Additionally, you can utilise custom events to develop event-based campaigns that are sent when users of your applications do particular actions. For instance, you can configure a campaign to send a message whenever a consumer registers for an account, makes a specified transaction, or adds an item to their basket but decides not to check out.

With the aid of event-based campaigns, you can reach out to your audience with timely, relevant, and personalised messages that build their trust in your company and encourage them to buy from you again. Using the Amazon Pinpoint console or the Amazon Pinpoint API, you may build event-based campaigns.


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Ques. 6): What exactly is a "session"?

Answer:

When an app is launched (or brought to the foreground), a session begins, and it ends when the app is closed (or goes to the background). An idle interval of up to 5 seconds does not count as a new session in order to account for small interruptions, such as a text message. Total daily sessions displays the daily usage of your app. The average number of sessions per user who is an active daily user is displayed.

 

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Ques. 7): Where can I find analytics information?

Answer:

The Amazon Pinpoint console lets you access analytics information. The interface offers thorough graphs and stats for each of your projects that offer insight into things like client demographics, application usage, purchase activity, campaign delivery and engagement rates, and customer activity. A portion of these metrics are also available programmatically using the Amazon Pinpoint API.


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Ques. 8): Will this phone number be used to send every SMS message to US recipients if I only have one 10DLC phone number in my account?

Answer:

Yes. Any messages you send to receivers in the US will go through that number if you just have one US phone number in your account, whether it be a 10DLC number, a short code, or a toll-free number.

You can give your Origination Number in your call to the Amazon Pinpoint API if your account has several numbers. Without a specific origination number specified, Amazon Pinpoint finds the most appropriate number to use to send your message. Amazon Pinpoint will send using your account's short code if one is present. If you don’t have a short code, it looks for a 10DLC phone number, and attempts to send using that number. If you don’t have a 10DLC number, it looks for a toll-free number, and attempts to send using that number.

 

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Ques. 9): How much time does it take to transfer 10DLC registrations between AWS accounts?

Answer:

While it is feasible to transfer 10DLC registrations between AWS accounts, the transfer procedure may take a few weeks to complete. We advise you to finish the 10DLC registration process on your primary production account as a result. Then, you may share your 10DLC phone numbers with other AWS accounts, such your test or development accounts, using cross-account access.

 

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Ques. 10): Will I experience throttling if my 10DLC campaign cannot handle my increased publishing rate?

Answer:

By default, Amazon Pinpoint only allows you to send 20 SMS messages each second. You will experience throttling issues if you go over this account-level cap. You may, however, ask for this cap to be raised.

 

With 10DLC, the corporate and campaign registration processes involve the cell carriers calculating a trust score for each sender. How many texts you can send to each carrier is based on your trust score. Your messages will start to be rejected by a specific carrier if you go over the campaign cap for that carrier. To track these events, Amazon highly advises that you activate event streaming.

 

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Ques. 11): Are URL shorteners compatible with 10DLC messages?

Answer:

Links that have been shortened using services like bit.ly or TinyURL are not permitted by mobile providers. When you add links in your communications, we advise using the complete domain of the URLs. As an alternative, you can employ dedicated domains with commercial URL shortening services. Even a URL shortener can be created utilising AWS services. If you employ a custom URL shortening domain, the name need to be immediately associated with your company. You should include instances of your shortened URLs when you supply your message templates during the 10DLC campaign registration procedure.

 

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Ques. 12): In what ways may I test Amazon Pinpoint?

Answer:

With Amazon Pinpoint, you can trial before you purchase without speaking to a salesperson, filling out an RFP, or engaging consultants or other professional services. Simply create an Amazon Pinpoint project by logging in with your AWS credentials to the Amazon Pinpoint console.

 

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Ques. 13): What does Sender ID mean?

Answer:

An SMS message's sender can be determined by the sender ID, which is an alphabetical name. If you use a sender ID to send an SMS and the recipient is in a region that supports sender ID authentication, your sender ID will appear on their device in place of a phone number. SMS recipients can learn more about the sender than they do from a phone number or short code thanks to a sender ID.

In many nations and areas of the world, sender IDs are supported. Businesses that send SMS messages to specific clients may need to use sender IDs that have been pre-registered with a regulatory body or industry association in various jurisdictions. For a complete list of countries and regions that support or require sender IDs, see Supported countries and regions (SMS channel).

 

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Ques. 14): What does a travel activity entail?

Answer:

Multi-step campaigns are automated by journeys. Every task in a journey is either an action (like sending an email), a wait depending on time, a segmentation of the trip based on the customer's action (like opening an email vs. not opening the email), or enforcing a holdout.

 

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Ques. 15): What should I do if I make a mistake while travelling?

Answer:

Journeys has a built-in review mechanism that looks for deal-breaker problems and offers suggestions and best practises. Before beginning each travel, this review process must be finished.

The test function in Journeys also makes it simple to send a group of test subjects on a journey. You may make sure that your journey acts as you anticipate by testing it first.

You can halt your journey at any point if you run into problems while it is in progress. When a journey is interrupted, people stop doing the activity they are doing right now and never move on to the following activity.

 

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Ques. 16): What's a standard campaign?

Answer:

A targeted segment (either static or dynamic), a message, and an execution timetable are all parts of a standard campaign. When you establish a campaign, you may also use previously defined segments or define a new segment. Based on the segment-specific criteria, Amazon Pinpoint recalculates the current audience size for each campaign that is scheduled.

 

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Ques. 17): How can I launch an event-based campaign?

Answer:

Making a new campaign is the initial step in putting up an event-based campaign. You decide when the campaign should be sent on step 4 of the campaign development procedure. You have the option of sending the campaign when a certain time or event occurs. Select "When an event occurs" before selecting the occasions, characteristics, and metrics that launch your campaign.

 

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Ques. 18): What are bespoke occasions?

Answer:

Custom events are defined as event metrics by you. They provide the tracking of user actions unique to your game or application. Viewing the frequency of custom events is possible thanks to the Amazon Pinpoint event charts. Based on attributes and the values assigned to them, custom events can be filtered.

By giving them names like "Item Bought" or "Button Pressed," you may construct custom events. You can then give them context by supplying metrics and characteristics (for qualitative measures) (for quantitative measures). For instance, you can use "Item Bought" as a custom event, "Item XYZ" as an attribute, and "Item Price" as the metric if your business goal is to track purchases of things from within the app. You may search and filter for each property or metric in the custom events report. You can discover, for instance, how frequently "Item XYZ" was bought or how frequently "Item Price" was $1.99. Additionally, you can monitor minimum, maximum, or average metric values as well as analyse the weighted average of metric data (per session). We advise custom event names to be general and attribute names to be specific as a best practise.

 

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Ques. 19): What kinds of statistics are available on my mobile and web applications from Amazon Pinpoint?

Answer:

Several different types of common analytics are available through Amazon Pinpoint to help you understand how your application is doing. Metrics for active users, user behaviours and demographics, sessions, user retention, campaign efficacy, and transactional messages are all part of standard analytics. You may undertake in-depth analysis using these metrics together with the analytics tools on the console by filtering on certain segments, custom properties, and more.

 

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Ques. 20): How long are analytics data stored by Amazon Pinpoint?

Answer:

Your analytics data is automatically stored by Amazon Pinpoint for 90 days. To keep the data for a longer period of time, you can export data from the console to comma-separated values (.csv) files or set up Amazon Pinpoint to stream event data to Amazon Kinesis. You can view your data on the console or you can query a subset of it programmatically using the Amazon Pinpoint API. Kinesis is an Amazon Web Services (AWS) service that can instantly gather, analyse, and analyse data from other AWS services. Event data from Amazon Pinpoint can be sent to Kinesis Data Firehose, which streams data to Amazon S3 and Amazon Redshift, among other AWS data stores. Additionally, Kinesis Data Streams, which receives and maintains numerous data streams for processing in analytics applications, may receive data from Amazon Pinpoint.

 

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