functions/Invoke-DbaDbccFreeCache.ps1
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function Invoke-DbaDbccFreeCache { <# .SYNOPSIS Execution of Database Console Commands that clear Server level Memory caches .DESCRIPTION Allows execution of Database Console Commands that act at Server Level to clear Memory caches Allows execution of the following commands DBCC FREEPROCCACHE DBCC FREESESSIONCACHE DBCC FREESYSTEMCACHE Read more: - https://docs.microsoft.com/en-us/sql/t-sql/database-console-commands/dbcc-freeproccache-transact-sql - https://docs.microsoft.com/en-us/sql/t-sql/database-console-commands/dbcc-freesessioncache-transact-sql - https://docs.microsoft.com/en-us/sql/t-sql/database-console-commands/dbcc-freesystemcache-transact-sql .PARAMETER SqlInstance The target SQL Server instance or instances. .PARAMETER SqlCredential Login to the target instance using alternative credentials. Windows and SQL Authentication supported. Accepts credential objects (Get-Credential) .PARAMETER Operation DBCC Operation to Perform - Supports specific set of operations .PARAMETER InputValue Value used for Operation - meaning depends on Operation DBCC FREEPROCCACHE accepts a plan_handle of type varbinary(64) a sql_handle of type varbinary(64) or the name of a Resource Governor resource pool of type sysname If blank then clears all elements from the plan cache DBCC FREESYSTEMCACHE accepts 'ALL' for ALL specifies all supported caches or name of a Resource Governor pool cache Not required for other values .PARAMETER NoInformationalMessages Suppresses all informational messages. .PARAMETER MarkInUseForRemoval Used when Operation = DBCC FREESYSTEMCACHE Asynchronously frees currently used entries from their respective caches after they become unused .PARAMETER WhatIf Shows what would happen if the cmdlet runs. The cmdlet is not run. .PARAMETER Confirm Prompts you for confirmation before running the cmdlet. .PARAMETER EnableException By default, when something goes wrong we try to catch it, interpret it and give you a friendly warning message. This avoids overwhelming you with "sea of red" exceptions, but is inconvenient because it basically disables advanced scripting. Using this switch turns this "nice by default" feature off and enables you to catch exceptions with your own try/catch. .NOTES Tags: DBCC Author: Patrick Flynn (@sqllensman) Website: https://dbatools.io Copyright: (c) 2018 by dbatools, licensed under MIT License: MIT https://opensource.org/licenses/MIT .LINK https://dbatools.io/Invoke-DbaDbccFreeCache .EXAMPLE PS C:\> Invoke-DbaDbccFreeCache -SqlInstance SqlServer2017 -Operation FREEPROCCACHE Runs the command DBCC FREEPROCCACHE against the instance SqlServer2017 using Windows Authentication .EXAMPLE PS C:\> Invoke-DbaDbccFreeCache -SqlInstance SqlServer2017 -Operation FREESESSIONCACHE -NoInformationalMessages Runs the command DBCC FREESESSIONCACHE WITH NO_INFOMSGS against the instance SqlServer2017 using Windows Authentication .EXAMPLE PS C:\> Invoke-DbaDbccFreeCache -SqlInstance SqlServer2017 -Operation FREESYSTEMCACHE -NoInformationalMessages Runs the command DBCC FREESYSTEMCACHE WITH NO_INFOMSGS against the instance SqlServer2017 using Windows Authentication .EXAMPLE PS C:\> Invoke-DbaDbccFreeCache -SqlInstance SqlServer2017 -Operation FREEPROCCACHE -InputValue 0x060006001ECA270EC0215D05000000000000000000000000 Remove a specific plan with plan_handle 0x060006001ECA270EC0215D05000000000000000000000000 from the cache via the command DBCC FREEPROCCACHE(0x060006001ECA270EC0215D05000000000000000000000000) against the instance SqlServer2017 using Windows Authentication .EXAMPLE PS C:\> Invoke-DbaDbccFreeCache -SqlInstance SqlServer2017 -Operation FREEPROCCACHE -InputValue default Runs the command DBCC FREEPROCCACHE('default') against the instance SqlServer2017 using Windows Authentication. This clears all cache entries associated with a resource pool 'default'. .EXAMPLE PS C:\> Invoke-DbaDbccFreeCache -SqlInstance SqlServer2017 -Operation FREESYSTEMCACHE -InputValue default Runs the command DBCC FREESYSTEMCACHE ('ALL', default) against the instance SqlServer2017 using Windows Authentication. This will clean all the caches with entries specific to the resource pool named "default". .EXAMPLE PS C:\> Invoke-DbaDbccFreeCache -SqlInstance SqlServer2017 -Operation FREESYSTEMCACHE -InputValue default -MarkInUseForRemoval Runs the command DBCC FREESYSTEMCACHE ('ALL', default) WITH MARK_IN_USE_FOR_REMOVAL against the instance SqlServer2017 using Windows Authentication. This will to release entries once the entries become unused for all the caches with entries specific to the resource pool named "default". #> [CmdletBinding(DefaultParameterSetName = "Default", SupportsShouldProcess, ConfirmImpact = 'High')] param ( [parameter(Mandatory, ValueFromPipeline)] [DbaInstanceParameter[]]$SqlInstance, [PSCredential]$SqlCredential, [ValidateSet('FreeProcCache', 'FreeSessionCache', 'FreeSystemCache')] [string]$Operation = "FreeProcCache", [string]$InputValue, [switch]$NoInformationalMessages, [switch]$MarkInUseForRemoval, [switch]$EnableException ) begin { if (Test-Bound -ParameterName Operation) { $Operation = $Operation.ToUpper() } else { Write-Message -Level Warning -Message "You must specify an operation " continue } $stringBuilder = New-Object System.Text.StringBuilder if ($Operation -eq 'FREESESSIONCACHE') { $null = $stringBuilder.Append("DBCC $Operation") if (Test-Bound -ParameterName NoInformationalMessages) { $null = $stringBuilder.Append(" WITH NO_INFOMSGS") } } if ($Operation -eq 'FREEPROCCACHE') { if (Test-Bound -ParameterName InputValue) { if ($InputValue.StartsWith('0x')) { $null = $stringBuilder.Append("DBCC $Operation($InputValue)") } else { $null = $stringBuilder.Append("DBCC $Operation('$InputValue')") } if (Test-Bound -ParameterName NoInformationalMessages) { $null = $stringBuilder.Append(" WITH NO_INFOMSGS") } } else { $null = $stringBuilder.Append("DBCC $Operation") if (Test-Bound -ParameterName NoInformationalMessages) { $null = $stringBuilder.Append(" WITH NO_INFOMSGS") } } } if ($Operation -eq 'FREESYSTEMCACHE') { if (Test-Bound -ParameterName InputValue) { $null = $stringBuilder.Append("DBCC FREESYSTEMCACHE('ALL', $InputValue)") } else { $null = $stringBuilder.Append("DBCC FREESYSTEMCACHE('ALL')") } if (Test-Bound -ParameterName NoInformationalMessages) { if (Test-Bound -ParameterName MarkInUseForRemoval) { $null = $stringBuilder.Append(" WITH NO_INFOMSGS, MARK_IN_USE_FOR_REMOVAL") } else { $null = $stringBuilder.Append(" WITH NO_INFOMSGS") } } elseif (Test-Bound -ParameterName MarkInUseForRemoval) { $null = $stringBuilder.Append(" WITH MARK_IN_USE_FOR_REMOVAL") } } } process { $query = $StringBuilder.ToString() foreach ($instance in $SqlInstance) { Write-Message -Message "Attempting Connection to $instance" -Level Verbose try { $server = Connect-SqlInstance -SqlInstance $instance -SqlCredential $SqlCredential } catch { Stop-Function -Message "Failure" -Category ConnectionError -ErrorRecord $_ -Target $instance -Continue } try { if ($Pscmdlet.ShouldProcess($server.Name, "Execute the command $query against $instance")) { Write-Message -Message "Query to run: $query" -Level Verbose $results = $server | Invoke-DbaQuery -Query $query -MessagesToOutput } } catch { Stop-Function -Message "Failure" -ErrorRecord $_ -Target $server -Continue } if ($Pscmdlet.ShouldProcess("console", "Outputting object")) { [PSCustomObject]@{ ComputerName = $server.ComputerName InstanceName = $server.ServiceName SqlInstance = $server.DomainInstanceName Operation = $Operation Cmd = $query.ToString() Output = $results } } } } } |