Interview Questions.

Question 1. What Happened To The Documentdb Api?

Answer :

The Azure Cosmos DB DocumentDB API or SQL (DocumentDB) API is now referred to as Azure Cosmos DB SQL API. You do not want to trade anything to hold going for walks your apps built with DocumentDB API. The capability remains the identical.

If you had a DocumentDB API account before, you presently have a SQL API account, without a exchange in your billing.

Question 2. What Is Understand Of The Etag?

Answer :

Each DocumentDB document has an ETag assets that is up to date on every occasion the document is updated and you could enforce that the ETag ought to be identical to what you opened earlier than while you replace the your report.

The hassle with the ETag is that it's miles connected to the file now not the saved JSON item. So all techniques we've for fetching a typed Order and write typed Linq statements against the order is efficaciously made unusable. You have to not (in my opinion) manually add the ETag to the orders item as JSONProperty both. In idea you can upload a belongings to your objects like.

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Question 3. What Is Configure Documentdb For Optimistic Concurrency Using The Etag?

Answer :

So now we've prepared for utilization of Optimistic Concurrency. Now it's far just to make certain that we use it. The way DocumentDB implements Optimistic Concurrency is by using using AccessConditions. These are brought as RequestOptions in the ReplaceDocument API call.

I delivered the subsequent  overloads in the DocumentDBRepository. One accepts dynamic and one which accepts a Document (I advocate the usage of the Document overload).

Question 4. How Is Documentdb Pessimistic Concurrency?

Answer :

There is no integrated help for managing pessimistic concurrency in DocumentDB so you would have to put into effect it your self. I would not advocate this due to the fact you need to take care of deadlocks, lock expiry and advanced database topics manually.

I haven’t examine up on permissions on files but and maybe that is a begin to restrict get admission to to a document temporary (need to go back on that difficulty). Doing it the hard manner and imposing your very own pessimistic locking mechanism is to a sequence of posts itself and frankly it will maximum in all likelihood be a horrific idea as one of DocumentDBs predominant advantages isthe fast throughput/access instances which you may very likely kill in case you add pessimistic concurrency to this component.

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Question five. What Is Partial Updates?

Answer :

Partial updates are currently not supported in DocumentDB. This way that you may save the whole file upon time of writing.
So a state of affairs of having  order strains being changed via separate people isn't feasible and also you have to use positive concurrency and reload the item if it's been up to date some place else.
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Question 6. How To Handle Concurrent Updates To The Same Document?

Answer :

When precondition (ETag fit) fails Replace Document Async will throw Document Client Exception (Inner Exception to be unique).

To check if the motive of exception is non-present day ETag we've to test if Status Code is Http Status Code. Precondition Failed. 

Question 7. What Is Documentdb?

Answer :

DocumentDB is a totally controlled NoSQL database carrier constructed for fast and predictable performance, high.Availability, elastic scaling, worldwide distribution, and ease of improvement. As a schema-free NoSQL database,DocumentDB offers rich and familiar SQL question competencies with consistent low latencies on JSON records -making sure that ninety nine% of your reads are served under 10 milliseconds and 99% of your writes are served underneath 15milliseconds.

These particular advantages make DocumentDB a superb healthy for internet, cell, gaming, and IoT, and manyother applications that want seamless scale and international replication.

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Question 8. How Can I Learn About Documentdb?

Answer :

A short manner to learn about DocumentDB and see it in motion is to comply with those 3 steps:

Watch the two minute video, which introduces the advantages of the use of DocumentDB.
Watch the three minute Create DocumentDB on Azurevideo, which highlights how to get started with DocumentDB by means of the usage of the Azure Portal.
Visit the Query Playground, in which you could stroll through specific activities to find out about the rich querying functionality to be had in DocumentDB. Then, head over to the Sandbox tab and run your personal custom SQLqueries and test with DocumentDB.
Question 9. What Capabilities And Key Features Does Documentdb Offer?

Answer :

Azure DocumentDB offers the subsequent key skills and advantages:

Elastically scalable throughput and storage: Easily scale up or scale down your DocumentDB JSONdatabase to fulfill your utility wishes. Your facts is saved on strong kingdom disks (SSD) for owredictablelatencies. DocumentDB helps containers for storing JSON information called collections which could scale to virtuallyunlimited storage sizes and provisioned throughput.

Multi-location replication: MDocumentDB transparently replicates your statistics to all areas you've got related to your DocumentDB account, permitting you to expand programs that require worldwide get entry to to facts whileproviding tradeoffs between consistency, availability and overall performance, all with corresponding ensures.DocumentDB presents transparent regional failover with multi-homing APIs, and the capacity to elastically scalethroughput and garage throughout the globe.

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Question 10. How Does Documentdb Manage Data?

Answer :

Azure DocumentDB manages JSON facts thru properly-defined database assets. These resources are replicatedfor excessive availability and are uniquely addressable by their logical URI. DocumentDB gives a easy HTTP based totally.

RESTful programming version for all assets.The DocumentDB database account is a unique namespace that gives you get right of entry to to Azure DocumentDB. Beforeyou can create a database account, you have to have an Azure subscription, which gives you get right of entry to to a diffusion ofAzure services.All sources inside DocumentDB are modeled and saved as JSON documents. 

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Question eleven. How Can I Develop Apps With Documentdb?

Answer :

Azure DocumentDB exposes resources via a REST API that may be known as by means of any language capable of makingHTTP/HTTPS requests. Additionally, DocumentDB offers programming libraries for several famous languages.

These libraries simplify many elements of working with Azure DocumentDB by means of managing info including addresscaching, exception management, automated retries and so on.

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Question 12. Common Use Cases For Documentdb?

Answer :

Azure DocumentDB is a popular cause NoSQL database that is used in a huge range of programs and usecases. It is a good desire for any software that needs low order-of-millisecond reaction instances, and desires toscale rapidly.

The following are some attributes of DocumentDB that make it nicely-applicable for excessive-performanceapplications:

DocumentDB natively partitions your information for excessive availability and scalability.
DocumentDB's has SSD sponsored storage with low-latency order-of-millisecond response instances.
DocumentDB's aid for consistency degrees like eventual, session and bounded-staleness lets in for low price-to performance-ratio.
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Question 13. What Is Web And Mobile Applications?

Answer :

DocumentDB is typically used within net and cell packages, and is in particular properly suited for modelingsocial interactions, integrating with 1/3-party services, and for building rich personalized studies.

Social application: A common use case for DocumentDB is to save and query person generated content (UGC) for internet and cellular applications, particularly social media packages.

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