functions/Get-DbaLastGoodCheckDb.ps1
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function Get-DbaLastGoodCheckDb { <# .SYNOPSIS Get date/time for last known good DBCC CHECKDB .DESCRIPTION Retrieves and compares the date/time for the last known good DBCC CHECKDB, as well as the creation date/time for the database. This function supports SQL Server 2005 and higher. Please note that this script uses the DBCC DBINFO() WITH TABLERESULTS. DBCC DBINFO has several known weak points, such as: - DBCC DBINFO is an undocumented feature/command. - The LastKnowGood timestamp is updated when a DBCC CHECKFILEGROUP is performed. - The LastKnowGood timestamp is updated when a DBCC CHECKDB WITH PHYSICAL_ONLY is performed. - The LastKnowGood timestamp does not get updated when a database in READ_ONLY. An empty ($null) LastGoodCheckDb result indicates that a good DBCC CHECKDB has never been performed. SQL Server 2008R2 has a "bug" that causes each databases to possess two dbi_dbccLastKnownGood fields, instead of the normal one. This script will only display this function to only display the newest timestamp. If -Verbose is specified, the function will announce every time more than one dbi_dbccLastKnownGood fields is encountered. .PARAMETER SqlInstance The target SQL Server instance or instances. Defaults to localhost. .PARAMETER SqlCredential Login to the target instance using alternative credentials. Windows and SQL Authentication supported. Accepts credential objects (Get-Credential) .PARAMETER Database Specifies one or more database(s) to process. If unspecified, all databases will be processed. .PARAMETER ExcludeDatabase Specifies one or more database(s) to exclude from processing. .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: CHECKDB, Database Author: Jakob Bindslet (jakob@bindslet.dk) Website: https://dbatools.io Copyright: (c) 2018 by dbatools, licensed under MIT License: MIT https://opensource.org/licenses/MIT Ref: DBCC CHECKDB: https://msdn.microsoft.com/en-us/library/ms176064.aspx http://www.sqlcopilot.com/dbcc-checkdb.html Data Purity: http://www.sqlskills.com/blogs/paul/checkdb-from-every-angle-how-to-tell-if-data-purity-checks-will-be-run/ https://www.mssqltips.com/sqlservertip/1988/ensure-sql-server-data-purity-checks-are-performed/ .LINK https://dbatools.io/Get-DbaLastGoodCheckDb .EXAMPLE PS C:\> Get-DbaLastGoodCheckDb -SqlInstance ServerA\sql987 Returns a custom object displaying Server, Database, DatabaseCreated, LastGoodCheckDb, DaysSinceDbCreated, DaysSinceLastGoodCheckDb, Status and DataPurityEnabled .EXAMPLE PS C:\> Get-DbaLastGoodCheckDb -SqlInstance ServerA\sql987 -SqlCredential sqladmin | Format-Table -AutoSize Returns a formatted table displaying Server, Database, DatabaseCreated, LastGoodCheckDb, DaysSinceDbCreated, DaysSinceLastGoodCheckDb, Status and DataPurityEnabled. Authenticates using SQL Server authentication. .EXAMPLE PS C:\> Get-DbaLastGoodCheckDb -SqlInstance sql2016 -ExcludeDatabase "TempDB" | Format-Table -AutoSize Returns a formatted table displaying Server, Database, DatabaseCreated, LastGoodCheckDb, DaysSinceDbCreated, DaysSinceLastGoodCheckDb, Status and DataPurityEnabled. All databases except for "TempDB" will be displayed in the output. #> [CmdletBinding()] param ( [parameter(Mandatory, ValueFromPipeline)] [Alias("ServerInstance", "SqlServer")] [DbaInstanceParameter[]]$SqlInstance, [Alias("Credential")] [PSCredential]$SqlCredential, [Alias("Databases")] [object[]]$Database, [object[]]$ExcludeDatabase, [Alias('Silent')] [switch]$EnableException ) process { foreach ($instance in $SqlInstance) { try { $server = Connect-SqlInstance -SqlInstance $instance -SqlCredential $sqlcredential } catch { Stop-Function -Message "Error occurred while establishing connection to $instance" -Category ConnectionError -ErrorRecord $_ -Target $instance -Continue } if ($server.versionMajor -lt 9) { Stop-Function -Message "Get-DbaLastGoodCheckDb is only supported on SQL Server 2005 and above. Skipping Instance." -Continue -Target $instance } $dbs = $server.Databases if ($Database) { $dbs = $dbs | Where-Object Name -In $Database } if ($ExcludeDatabase) { $dbs = $dbs | Where-Object Name -NotIn $ExcludeDatabase } foreach ($db in $dbs) { Write-Message -Level Verbose -Message "Processing $db on $instances." if ($db.IsAccessible -eq $false) { Stop-Function -Message "The database $db is not accessible. Skipping database." -Continue -Target $db } $sql = "DBCC DBINFO ([$($db.name)]) WITH TABLERESULTS" Write-Message -Level Debug -Message "T-SQL: $sql" $resultTable = $db.ExecuteWithResults($sql).Tables[0] [datetime[]]$lastKnownGoodArray = $resultTable | Where-Object Field -eq 'dbi_dbccLastKnownGood' | Select-Object -ExpandProperty Value ## look for databases with two or more occurrences of the field dbi_dbccLastKnownGood if ($lastKnownGoodArray.count -ge 2) { Write-Message -Level Verbose -Message "The database $db has $($lastKnownGoodArray.count) dbi_dbccLastKnownGood fields. This script will only use the newest!" } [datetime]$lastKnownGood = $lastKnownGoodArray | Sort-Object -Descending | Select-Object -First 1 [int]$createVersion = ($resultTable | Where-Object Field -eq 'dbi_createVersion').Value [int]$dbccFlags = ($resultTable | Where-Object Field -eq 'dbi_dbccFlags').Value if (($createVersion -lt 611) -and ($dbccFlags -eq 0)) { $dataPurityEnabled = $false } else { $dataPurityEnabled = $true } $daysSinceCheckDb = (New-TimeSpan -Start $lastKnownGood -End (Get-Date)).Days $daysSinceDbCreated = (New-TimeSpan -Start $db.createDate -End (Get-Date)).TotalDays if ($daysSinceCheckDb -lt 7) { $Status = 'Ok' } elseif ($daysSinceDbCreated -lt 7) { $Status = 'New database, not checked yet' } else { $Status = 'CheckDB should be performed' } if ($lastKnownGood -eq '1/1/1900 12:00:00 AM') { Remove-Variable -Name lastKnownGood, daysSinceCheckDb } [PSCustomObject]@{ ComputerName = $server.ComputerName InstanceName = $server.ServiceName SqlInstance = $server.DomainInstanceName Database = $db.name DatabaseCreated = $db.createDate LastGoodCheckDb = $lastKnownGood DaysSinceDbCreated = $daysSinceDbCreated DaysSinceLastGoodCheckDb = $daysSinceCheckDb Status = $status DataPurityEnabled = $dataPurityEnabled CreateVersion = $createVersion DbccFlags = $dbccFlags } } } } } |