functions/Test-SqlNetworkLatency.ps1
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Function Test-SqlNetworkLatency { <# .SYNOPSIS Tests how long a query takes to return from SQL Server .DESCRIPTION This function is intended to help measure SQL Server network latency by establishing a connection and making a simple query. This is a better alternative than ping because it actually creates the connection to the SQL Server, and times not ony the entire routine, but also how long the actual queries take vs how long it takes to get the results. Server Count TotalMs AvgMs ExecuteOnlyTotalMS ExecuteOnlyAvgMS .PARAMETER SqlInstance The SQL Server instance. .PARAMETER SqlCredential Allows you to login to servers using SQL Logins as opposed to Windows Auth/Integrated/Trusted. To use: $scred = Get-Credential, then pass $scred object to the -SqlCredential parameter. Windows Authentication will be used if SqlCredential is not specified. SQL Server does not accept Windows credentials being passed as credentials. To connect as a different Windows user, run PowerShell as that user. .PARAMETER Query Specifies the query to be executed. By default, "SELECT TOP 100 * FROM INFORMATION_SCHEMA.TABLES" will be executed on master. To execute in other databases, use fully qualified table names. .PARAMETER Count Specifies how many times the query should be executed. By default, the query is executed three times. .PARAMETER WhatIf Shows what would happen if the command were to run. No actions are actually performed. .PARAMETER Confirm Prompts you for confirmation before executing any changing operations within the command. .PARAMETER Silent Use this switch to disable any kind of verbose messages .NOTES Tags: Performance, Network Website: https://dbatools.io Copyright: (C) Chrissy LeMaire, clemaire@gmail.com License: GNU GPL v3 https://opensource.org/licenses/GPL-3.0 .LINK https://dbatools.io/Test-SqlNetworkLatency .EXAMPLE Test-SqlNetworkLatency -SqlInstance sqlserver2014a, sqlcluster Times the roundtrip return of "SELECT TOP 100 * FROM INFORMATION_SCHEMA.TABLES" on sqlserver2014a and sqlcluster using Windows credentials. .EXAMPLE Test-SqlNetworkLatency -SqlInstance sqlserver2014a -SqlCredential $cred Times the execution results return of "SELECT TOP 100 * FROM INFORMATION_SCHEMA.TABLES" on sqlserver2014a using SQL credentials. .EXAMPLE Test-SqlNetworkLatency -SqlInstance sqlserver2014a, sqlcluster, sqlserver -Query "select top 10 * from otherdb.dbo.table" -Count 10 Times the execution results return of "select top 10 * from otherdb.dbo.table" 10 times on sqlserver2014a, sqlcluster, and sqlserver using Windows credentials. #> [CmdletBinding()] [OutputType([System.Object[]])] param ( [parameter(Mandatory = $true, ValueFromPipeline = $true)] [Alias("ServerInstance", "SqlServer")] [object[]]$SqlInstance, [PsCredential]$SqlCredential, [string]$Query = "select top 100 * from INFORMATION_SCHEMA.TABLES", [int]$Count = 3, [switch]$Silent ) process { foreach ($instance in $SqlInstance) { try { $start = [System.Diagnostics.Stopwatch]::StartNew() $currentcount = 0 try { Write-Message -Level Verbose -Message "Connecting to $instance" $server = Connect-SqlServer -SqlServer $instance -SqlCredential $sqlcredential } catch { Stop-Function -Message "Failed to connect to $instance : $($_.Exception.Message)" -Continue -Target $instance -InnerErrorRecord $_ } do { if (++$currentcount -eq 1) { $first = [System.Diagnostics.Stopwatch]::StartNew() } $server.ConnectionContext.ExecuteWithResults($query) | Out-Null if ($currentcount -eq $count) { $last = $first.elapsed } } while ($currentcount -lt $count) $end = $start.elapsed $totaltime = $end.TotalMilliseconds $avg = $totaltime / $count $totalwarm = $last.TotalMilliseconds $avgwarm = $totalwarm / ($count - 1) [PSCustomObject]@{ ComputerName = $server.NetName InstanceName = $server.ServiceName SqlInstance = $server.DomainInstanceName Count = $count TotalMs = $totaltime AvgMs = $avg ExecuteOnlyTotalMs = $totalwarm ExecuteOnlyAvgMs = $avgwarm } } catch { Stop-Function -Message "Error occurred: $_" -InnerErrorRecord $_ -Continue } } } } |