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AZ - 204 > Develop for azure storage > Flashcards

Develop for azure storage Flashcards

1
Q

What is Azure Blob Storage

A

Object storage used for the cloud - optimized for storing massive amounts of unstructured data.

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2
Q

What is blob storage designed for?

A

Serving images or documents directly to a browser
Storing files for distributed access
Streaming video and audio
Writing to log files
Backups
Storing data for analysis by an on-premises or azure-hosted service

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3
Q

How can you access azure blog storage objects?

A

Via REST API, Azure powershell, Azure CLI, or Azure Storage client library

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4
Q

What are the types of storage accounts?

A

v1 - old standard type, not offered
v2 - Standard - most recommended
Premium - uses solid-state drives.
Choose between block blobs, page blobs, or file shares.

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5
Q

What are the access tiers for block blob data? What is another name for these tiers?

A

Hot - frequent access of objects
Cool - Storing large amounts of data that is infrequently accessed and stored for at least 30 days
Archive - Several hours of retrieval latency, but remain for at least 180 days. Most cost effective

Another name is the blob lifecycle.

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6
Q

What are the blob storage resource types?

A
  • Storage account
  • Container in the storage account
  • Blob in the container
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7
Q

What would the account access be for the mystorageaccount

A

http://mystorageaccount.blob.core.windows.net

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8
Q

What are the types of blobs?

A
  • Block blobs - for binary data and text
  • Append blobs - optimized for append operations
  • Page blobs - Store random access files up to 8 TB in size. Store virtual hard drive files
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9
Q

Is Azure storage encrypted?

A

Yes, automatically by Storage Service Encryption (SSE)

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10
Q

How can you specify encryption keys for Azure Storage?

A
  • customer-managed - key provided for encrypting for Blob storage and Azure files
  • customer-provided - on blob storage operations. Can add it with the request to have granular control over encryption.
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11
Q

What is LRS, ZRS, GRS, and GZRS?

A
  • LRS - Locally redundant storage - three times copies within a single physical location in the primary region.
  • ZRS - Zone-redundant storage - Copies your data synchronously across three azure availability zones in the primary region
  • GRS - Geo-redundant storage - copies your data three times within a single physical location in the secondary region
  • GZRS - Geo-zone-redundant storage - Copies your data across to a single physical location in a secondary region, and three times in the primary region across three availability zones.
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12
Q

How would you create an Azure storage from Azure CLI? Start from beginning

A

az group create –name –location

az storage account create –resource-group –name –location –kind BlockBlobStorage –sku Premium_LRS

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13
Q

What redundancy types does cold, hot, and archive blobs support?

A

All, except for Archive which is only LRS, GRS, and RA-GRS. No zone stuff.

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14
Q

How is a lifecycle management policy set for azure blobs?

A

Through a collection of rules in a JSON document. Each rule definition has a filter set and an action set.

Generally each rule will have:

  • name
  • type
  • definition
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15
Q

How are lifecycle rules structured?

A 
{
"name": ,
"type": "Lifecycle",
"Definition": {
  "filters": {

},
“actions”: {

}
}
}

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16
Q

What are some rule actions for lifecycle of blobs?

A

tierToCool
tierToArchive
delete

Generally have

daysAfterModificationGreaterThan
or
daysAfterCreationGreaterThan

17
Q

What is a Re-hydrate policy?

A

Rehydrating is where you bring the offline archive data to online.

  • You can either set the blob tier operation
  • Coy blob or copy blob from url operation - most recommended approach
18
Q

What are the namespaces offered in .NET for working with Azure Blob Storage?

A

BlobClient - manipulate azure storage blobs
BlobClientOptions - Client configuration
BlobContainerClient - Access and manipulate storage containers
BlobServiceClient - Provies the top-level namespace for the blob service
BlobUriBuilder - Convenient way to modify the contents of a uri instance to point to different azure storage resources.

19
Q

How can you access container properties and metadata using .NET?

A

Functions part of BlobContainerClient:

  • GetProperties
  • GetPropertiesAsync
  • SetMetadata
  • SetMetadataAsync
20
Q

What is Azure Cosmos DB?

A

A globally distributed functional document database. that is highly available across multiple regions.

21
Q

What is an cosmosDB container?

A

Fundamental unit of scalability - the throughput and storage is managed horizontally.

22
Q

What is the difference between dedicated provisioned throughput mode and shared provisioned throughput mode?

A

Dedicated exclusively reserves a container and is backed by an SLA.
Shared means containers share provisioned throughput.

23
Q

What are the Azure Cosmos DB consistency levels?

A
  1. Strong
  2. Bounded Staleness
  3. Session
  4. Consistent Prefix
  5. Eventual
24
Q

What consistency level would you need for most real-world scenarios?

A
  • Recommended session consistency
25
Q

What consistency level would you need if your application requires strong consistency?

A

The best for this is bounded staleness.

26
Q

If your application requires eventual consistency what should you use?

A

Use consisten prefix consistency

27
Q

What are the supported APIs of Cosmos DB?

A
  • Core (SQL)
  • API for MongoDB
  • Cassandra API
  • Table API
  • Gremlin API - best for making Graph queries.
28
Q

What is a request unit (RU)?

A

The system of paying for throughput in Cosmos, that represents system resources such as CPU, IOPS, and memory.

1 RU = do a point read, for a 1KB item.

29
Q

What are the ways you provision RUs?

A

Provisioned throughput mode - specify up front how many RUs you want
Serverless mode - no provisioning, just get billed at the end of the pay period
Autoscale mode - Automatically and instanly scale the throughput of your database or container based on it’s usage.

30
Q

What is a partition key?

A

A partition key is a way to specify a logical partition within a database. An items index in the data base is determined by the partition key + itemID

31
Q

How should you choose a partition key?

A
  1. Be a property that has a value that does not change.
  2. Have high cardinality - a wide range of possible values
  3. Spreads request unit consumption and data storage evenly across all locial partitions
32
Q

When will your container require more than a few physical partitions?

A

When your container will have over 30,000 RUs provisions

When your container will store over 100 GB of data

33
Q

How could you create an azure cosmos DB from the az CLI?

A

az cosmosdb create –name {name} –resource-group {resource-group}
az cosmosdb keys list –name {name} –resource-group {resource-group}

AZ - 204 (6 decks)

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