Develop Azure Infrastructure as a Service Solutions
This is Part 3 of the AZ-203 study guide. In this post we'll cover:
Azure Storage
Familiarize yourself on how to query data and apply filters from C# with TableQuery.GenerateFilterCondition and TableQuery.Where
public static async Task<List<User>> FindUsersAsync(CloudTable table, string name)
{
// ⚠️ Remember how to create filters!
var filterCondition = TableQuery.GenerateFilterCondition(
"Name",
QueryComparison.Equal,
name);
var query = new TableQuery<User>.Where(filterCondition);
var results = await table.ExecuteQuerySegmentedAsync(query, null);
return results.ToList();
}Do checkout the other methods such as TableOperation.Retrieve, TableOperation.Delete
Cosmos DB
Create a Cosmos DB account
az cosmosdb create
-g "my-resource-group-name"
--name "cosmosDBaccountname"
--kind GlobalDocumentDB # MongoDB | Cassandra | Gremlin
Create a database
az cosmosdb database create
- g "my-resource-group-name"
--name "cosmosDBaccountname"
--db-name "my-database"Consistency Models
Read up on the different
Azure Cosmos DB Consistency Levels and know when to use them, specially the Strong and Bounded Staleness (the most expensive ones, by the way).
# ⚠️ How do you ensure reads reflect the most recent write".
With a strong consistency level.Blob Storage
The exam tends to ask questions about concurrency control in blobs. This involves using leases to checkout and block files so only you can update.
var leaseId = Guid.NewGuid().ToString();
cloudBlockBlob.AcquireLease(TimeSpan.FromSeconds(30), leaseId);
await cloudBlockBlob.ReleaseLeaseAsync(new AccessCondition()
{
LeaseId = leaseId
})Next up...
Go to Part 4 of the series on Azure Security