Azure Cosmos DB

  • Globally distributed database that supports NoSQL.
  • A fully-managed database service with turnkey global distribution and transparent multi-master replication.

Features

  • Cosmos DB offers encryption at rest.
  • It replicates every partition across all the regions.
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  • CosmosDB offers single-digit millisecond reads and writes in all regions.
  • Supports automatic failover during a regional outage.
  • Consistency Levels: Strong, Bounded Staleness, Session, Consistent Prefix, and Eventual
  • You can set either standard (manual) or autoscale provisioned throughput on your databases and containers.
  • Monitor both the provisioned autoscale max RU/s and the current throughput (RU/s) of the system with Azure Monitor metrics.

Consistency Levels

  • Strong – reads are guaranteed to return the most recent committed version of an item.
  • Bounded Staleness – is for low write latencies but requires a total global order guarantee.
  • Session – reads are guaranteed to honor the consistent-prefix, monotonic reads, monotonic writes, read-your-writes, and write-follows-reads guarantees.
  • Consistent Prefixupdates that are returned will contain some prefix of all the updates.
  • Eventualhas no ordering guarantee for reads.

Security

  • Encryption at rest is applied automatically.
  • Uses AES-256 encryption in all regions.
  • You can use the keys that are managed by Microsoft or customer-managed keys.
  • Two types of keys to authenticate users:
    • Master Keys for administrative resources.
    • Resources Tokens for application resources.
  • Detect suspicious activities which indicate unusual and potentially harmful attempts to access or exploit databases with Advanced Threat Protection.

Pricing

  • Elastically scale the provisioned throughput and storage for your databases according to your needs and only pay for the throughput and storage needed.
  • Cosmos DB throughput per second and request unit consumption varies by operation and JSON document.
  • Additional backup copies will be billed as total GBs of data stored (first two copies are free).
  • You provision the number of RUs for your application on a per-second basis in increments of 100 RUs per second. You are billed on an hourly basis.
  • With autoscale for containers, you pay per hour for the highest RU/s that the system scaled up to within the hour.

Azure SQL Database vs Cosmos DB:
https://tutorialsdojo.com/azure-sql-database-vs-cosmos-db/

Technical Overview and Unique Features of Azure Cosmos DB

Validate Your Knowledge

Question 1

Question Type: Single-choice

Note: This item is part of a series of questions with the exact same scenario but with a different proposed answer. Each one in the series has a unique solution that may, or may not, comply with the requirements specified in the scenario.

Your company plans to deploy several virtual machines that will host its business-critical application to Azure.

You need to recommend a solution to ensure that if a single data center fails, the application will not be affected.

Solution: Deploy virtual machines to multiple resource groups with the same availability zone.

Does this meet the goal?

  1. Yes
  2. No

Correct Answer: 2

A resource group is a container that holds related resources for an Azure solution. The resource group can include all the resources for the solution or only those resources that you want to manage as a group. You decide how you want to allocate resources to resource groups based on what makes the most sense for your organization.

Availability zones expand the level of control you have to maintain the availability of the applications and data on your VMs. Availability Zones are unique physical locations within an Azure region. Each zone is made up of one or more data centers equipped with independent power, cooling, and networking.

Availability zones

Deploying your virtual machines into multiple resource groups won’t increase its availability of your VMs in the event of Azure data center outage. A resource group is only a logical container that contains the metadata of the resource contained within it.

With Availability Zones, Azure offers industry best 99.99% VM uptime SLA. By architecting your solutions to use replicated VMs in zones, you can protect your applications and data from the loss of a datacenter. If one zone is compromised then replicated apps and data are instantly available in another zone.

In this scenario, deploying virtual machines to multiple resource groups with the same availability zone will not prevent an outage in the event that a single data center fails. You must deploy your servers to multiple Availability Zones or Regions to ensure the availability of your application.

Therefore, the correct answer is: No.

References

https://docs.microsoft.com/en-us/azure/availability-zones/az-overview
https://docs.microsoft.com/en-us/azure/virtual-machines/windows/manage-availability

Note: This question was extracted from our AZ-900 Microsoft Azure Fundamentals Practice Exams.

For more Azure practice exam questions with detailed explanations, check out the Tutorials Dojo Portal:

Microsoft Azure Practice Exams Tutorials Dojo

Sources:
https://docs.microsoft.com/en-us/azure/cosmos-db/introduction
https://azure.microsoft.com/en-us/free/cosmos-db/

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