Question

如果在任何时候DTU利用率很高，我就必须扩展Azure SQL，如果在一定时间内消耗量较低，则必须缩减Azure SQL。

我知道这可以通过设置警报规则和Web挂钩来完成，但是正在寻找一些可重用的东西，我可以参考和利用它。...

Answer 1

向上和向下进行缩放需要时间，有时甚至会超出预期。通常需要5-10分钟，但有时需要25-30分钟。扩展时数据库越忙，向上或向下扩展花费的时间越多。数据库的大小也很重要。

还请记住，在进行规模调整时会回滚事务。

我的建议是使用以下查询来确定资源消耗的模式，然后自动进行数据库的向上和向下扩展。

SELECT *
FROM sys.dm_db_resource_stats
ORDER BY end_time

在一周的几小时和几天内查看该数据，以方便模式识别。之后，使用Azure自动化和以下PowerShell的一部分来自动化数据库的放大/缩小。以下PowerShell可以完成您想做的所有事情，它监视DTU的使用情况，然后根据消耗量触发扩展过程。

# Login-AzureRmAccount
# Set the resource group name and location for your server
$resourcegroupname = "myResourceGroup-$(Get-Random)"
$location = "southcentralus"
# Set an admin login and password for your server
$adminlogin = "ServerAdmin"
$password = "ChangeYourAdminPassword1"
# The logical server name has to be unique in the system
$servername = "server-$(Get-Random)"
# The sample database name
$databasename = "mySampleDatabase"
# The ip address range that you want to allow to access your server
$startip = "0.0.0.0"
$endip = "0.0.0.0"

# Create a new resource group
$resourcegroup = New-AzureRmResourceGroup -Name $resourcegroupname -Location $location

# Create a new server with a system wide unique server name
$server = New-AzureRmSqlServer -ResourceGroupName $resourcegroupname `
    -ServerName $servername `
    -Location $location `
    -SqlAdministratorCredentials $(New-Object -TypeName System.Management.Automation.PSCredential -ArgumentList $adminlogin, $(ConvertTo-SecureString -String $password -AsPlainText -Force))

# Create a server firewall rule that allows access from the specified IP range
$serverfirewallrule = New-AzureRmSqlServerFirewallRule -ResourceGroupName $resourcegroupname `
    -ServerName $servername `
    -FirewallRuleName "AllowedIPs" -StartIpAddress $startip -EndIpAddress $endip

# Create a blank database with S0 performance level
$database = New-AzureRmSqlDatabase  -ResourceGroupName $resourcegroupname `
    -ServerName $servername `
    -DatabaseName $databasename -RequestedServiceObjectiveName "S0"

# Monitor the DTU consumption on the imported database in 5 minute intervals
$MonitorParameters = @{
  ResourceId = "/subscriptions/$($(Get-AzureRMContext).Subscription.Id)/resourceGroups/$resourcegroupname/providers/Microsoft.Sql/servers/$servername/databases/$databasename"
  TimeGrain = [TimeSpan]::Parse("00:05:00")
  MetricNames = "dtu_consumption_percent"

}
(Get-AzureRmMetric @MonitorParameters -DetailedOutput).MetricValues

# Scale the database performance to Standard S1
$database = Set-AzureRmSqlDatabase -ResourceGroupName $resourcegroupname `
    -ServerName $servername `
    -DatabaseName $databasename `
    -Edition "Standard" `
    -RequestedServiceObjectiveName "S1"

# Set an alert rule to automatically monitor DTU in the future
Add-AzureRMMetricAlertRule -ResourceGroup $resourcegroupname `
    -Name "MySampleAlertRule" `
    -Location $location `
    -TargetResourceId "/subscriptions/$($(Get-AzureRMContext).Subscription.Id)/resourceGroups/$resourcegroupname/providers/Microsoft.Sql/servers/$servername/databases/$databasename" `
    -MetricName "dtu_consumption_percent" `
    -Operator "GreaterThan" `
    -Threshold 90 `
    -WindowSize $([TimeSpan]::Parse("00:05:00")) `
    -TimeAggregationOperator "Average" `
    -Actions $(New-AzureRmAlertRuleEmail -SendToServiceOwners)

# Clean up deployment 
# Remove-AzureRmResourceGroup -ResourceGroupName $resourcegroupname

基于DTU消耗警报的Azure SQL自动SQL

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