Azure Database Solutions: A Complete Implementation Guide

Azure offers a comprehensive suite of database services to meet various application needs. This guide helps you choose and implement the right database solution for your requirements.

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Azure's main database offerings:

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``sql

-- Create a new database

CREATE DATABASE MyAppDB

(

EDITION = 'Standard',

SERVICE_OBJECTIVE = 'S1',

MAXSIZE = 250GB

)

`

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`json

{

"name": "MyAppDB",

"location": "[resourceGroup().location]",

"sku": {

"name": "Standard",

"tier": "Standard",

"capacity": 10

},

"properties": {

"collation": "SQL_Latin1_General_CP1_CI_AS",

"maxSizeBytes": "268435456000",

"zoneRedundant": true,

"readScale": "Enabled"

}

}

`

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`javascript

const { CosmosClient } = require("@azure/cosmos");

const client = new CosmosClient(connectionString);

async function createContainer() {

const { database } = await client.databases.createIfNotExists({ id: "MyAppDB" });

const { container } = await database.containers.createIfNotExists({

id: "Items",

partitionKey: {

paths: ["/category"]

},

indexingPolicy: {

indexingMode: "consistent",

automatic: true,

includedPaths: [

{

path: "/*"

}

],

excludedPaths: [

{

path: "/description/?"

}

]

}

});

return container;

}

`

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`json

{

"name": "[variables('accountName')]",

"type": "Microsoft.DocumentDB/databaseAccounts",

"apiVersion": "2021-04-15",

"location": "[parameters('location')]",

"kind": "GlobalDocumentDB",

"properties": {

"consistencyPolicy": {

"defaultConsistencyLevel": "Session"

},

"locations": [

{

"locationName": "East US",

"failoverPriority": 0

},

{

"locationName": "West US",

"failoverPriority": 1

}

],

"enableMultipleWriteLocations": true,

"enableAutomaticFailover": true

}

}

`

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`powershell

Azure Database Migration Service setup

$migrationService = New-AzDataMigration

-ResourceGroupName "MyResourceGroup"

-Name "MyMigrationService"

-Location "East US"

-Sku "Premium_4vCores"

Create migration project

$migrationProject = New-AzDataMigrationProject

-ResourceGroupName "MyResourceGroup"

-ServiceName "MyMigrationService"

-ProjectName "MyMigrationProject"

-Location "East US"

-SourceType "SQL"

-TargetType "SQLDB"

`

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`sql

-- Create indexes for performance

CREATE NONCLUSTERED INDEX IX_OrderDate

ON Sales.Orders (OrderDate)

INCLUDE (CustomerID, TotalAmount);

-- Update statistics

UPDATE STATISTICS Sales.Orders

WITH FULLSCAN;

-- Configure Query Store

ALTER DATABASE MyAppDB

SET QUERY_STORE = ON

(

OPERATION_MODE = READ_WRITE,

CLEANUP_POLICY = (STALE_QUERY_THRESHOLD_DAYS = 30),

DATA_FLUSH_INTERVAL_SECONDS = 900,

MAX_STORAGE_SIZE_MB = 1000

);

`

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`javascript

const containerOptions = {

throughput: 400,

partitionKey: { paths: ["/id"] },

indexingPolicy: {

indexingMode: "consistent",

automatic: true,

includedPaths: [

{

path: "/*",

indexes: [

{

kind: "Range",

dataType: "Number",

precision: -1

},

{

kind: "Range",

dataType: "String",

precision: -1

}

]

}

]

}

};

`

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`sql

-- Configure Always On availability

ALTER AVAILABILITY GROUP [AG_MyAppDB]

MODIFY REPLICA ON 'SecondaryNode'

WITH (AVAILABILITY_MODE = SYNCHRONOUS_COMMIT);

-- Add database to availability group

ALTER AVAILABILITY GROUP [AG_MyAppDB]

ADD DATABASE MyAppDB;

`

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`sql

-- Create contained database user

CREATE USER AppUser

WITH PASSWORD = 'ComplexPassword123!';

-- Grant permissions

GRANT SELECT, INSERT, UPDATE, DELETE

ON SCHEMA::dbo

TO AppUser;

-- Enable Row-Level Security

CREATE SECURITY POLICY FilterPolicy

ADD FILTER PREDICATE dbo.fn_securitypredicate(TenantId)

ON dbo.Orders;

`

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`javascript

const cosmosKey = await getSecretFromKeyVault("cosmos-key");

const client = new CosmosClient({

endpoint: process.env.COSMOS_ENDPOINT,

key: cosmosKey,

connectionPolicy: {

enableEndpointDiscovery: true,

preferredLocations: ["East US", "West US"]

}

});

`

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`powershell

Enable diagnostic settings

Set-AzDiagnosticSetting

-ResourceId $database.Id

-WorkspaceId $workspaceId

-Enabled $true

-Category @("QueryStoreRuntimeStatistics", "Errors")

Set up alerts

New-AzMetricAlertRule

-Name "HighDTU"

-Location "East US"

-ResourceGroup "MyResourceGroup"

-TargetResourceId $database.Id

-MetricName "dtu_consumption_percent"

-Operator GreaterThan

-Threshold 90

-WindowSize "00:05:00"

-TimeAggregationOperator Average

```

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1. Database Selection

- Consider workload type

- Evaluate scaling needs

- Assess global distribution

- Review cost implications

2. Performance

- Implement proper indexing

- Use appropriate partitioning

- Monitor query performance

- Regular maintenance

3. Security

- Enable encryption

- Implement proper authentication

- Regular security audits

- Monitor access patterns

4. High Availability

- Configure geo-replication

- Implement failover groups

- Regular backup testing

- Monitor replication lag

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Common issues and solutions:

1. Performance Issues

- Check query plans

- Review index usage

- Monitor resource utilization

- Analyze wait statistics

2. Connectivity Problems

- Verify network settings

- Check firewall rules

- Review connection strings

- Monitor timeouts

3. Replication Issues

- Check replication status

- Monitor lag time

- Verify network connectivity

- Review error logs

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After implementing your database solution:

1. Set up monitoring and alerting

2. Implement backup strategies

3. Configure disaster recovery

4. Document maintenance procedures

5. Train database administrators

Remember to regularly review and update your database implementation to maintain optimal performance and reliability.