functions/Test-DbaVirtualLogFile.ps1
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function Test-DbaVirtualLogFile { <# .SYNOPSIS Returns database virtual log file information for database files on a SQL instance. .DESCRIPTION As you may already know, having a TLog file with too many VLFs can hurt database performance. Too many virtual log files can cause transaction log backups to slow down and can also slow down database recovery and, in extreme cases, even affect insert/update/delete performance. References: http://www.sqlskills.com/blogs/kimberly/transaction-log-vlfs-too-many-or-too-few/ http://blogs.msdn.com/b/saponsqlserver/archive/2012/02/22/too-many-virtual-log-files-vlfs-can-cause-slow-database-recovery.aspx If you've got a high number of VLFs, you can use Expand-SqlTLogResponsibly to reduce the number. .PARAMETER SqlInstance SQLServer name or SMO object representing the SQL Server to connect to. This can be a collection and receive pipeline input. .PARAMETER SqlCredential PSCredential object to connect under. If not specified, current Windows login will be used. .PARAMETER Database The database(s) to process - this list is auto-populated from the server. If unspecified, all databases will be processed. .PARAMETER ExcludeDatabase The database(s) to exclude - this list is auto-populated from the server .PARAMETER IncludeSystemDBs Switch parameter that when used will display system database information .PARAMETER Detailed Returns all information provided by DBCC LOGINFO plus the server name and database name .NOTES Tags: DisasterRecovery, Backup 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-DbaVirtualLogFile .EXAMPLE Test-DbaVirtualLogFile -SqlInstance sqlcluster Returns all user database virtual log file counts for the sqlcluster instance .EXAMPLE Test-DbaVirtualLogFile -SqlInstance sqlserver | Where-Object {$_.Count -ge 50} Returns user databases that have more than or equal to 50 VLFs .EXAMPLE @('sqlserver','sqlcluster') | Test-DbaVirtualLogFile Returns all VLF information for the sqlserver and sqlcluster SQL Server instances. Processes data via the pipeline. .EXAMPLE Test-DbaVirtualLogFile -SqlInstance sqlcluster -Database db1, db2 Returns VLF counts for the db1 and db2 databases on sqlcluster. #> [CmdletBinding()] [OutputType([System.Collections.ArrayList])] param ([parameter(ValueFromPipeline, Mandatory = $true)] [Alias("ServerInstance", "SqlServer")] [DbaInstanceParameter[]]$SqlInstance, [PSCredential]$SqlCredential, [Alias("Databases")] [object[]]$Database, [object[]]$ExcludeDatabase, [switch]$IncludeSystemDBs, [switch]$Detailed ) PROCESS { foreach ($servername in $SqlInstance) { Write-Verbose "Connecting to $servername" try { $server = Connect-SqlInstance $servername -SqlCredential $SqlCredential } catch { Write-Warning "Can't connect to $instance, skipping..." Continue } $dbs = $server.Databases #If IncludeSystemDBs is true, include systemdbs #only look at online databases (Status equal normal) if ($Database) { $dbs = $dbs | Where-Object { $Database -contains $_.Name } } if ($ExcludeDatabase) { $dbs = $dbs | Where-Object Name -notin $ExcludeDatabase } if ($IncludeSystemDBs) { $dbs = $dbs | Where-Object { $_.status -eq 'Normal' } } else { $dbs = $dbs | Where-Object { $_.status -eq 'Normal' -and $_.IsSystemObject -eq 0 } } foreach ($db in $dbs) { try { Write-Verbose "Querying $($db.name) on $servername." #Execute query against individual database and add to output if ($Detailed -eq $true) { $table = New-Object System.Data.Datatable $servercolumn = $table.Columns.Add("Server") $servercolumn.DefaultValue = $server.name $dbcolumn = $table.Columns.Add("Database") $dbcolumn.DefaultValue = $db.name $temptable = $db.ExecuteWithResults("DBCC LOGINFO").Tables foreach ($column in $temptable.Columns) { $null = $table.Columns.Add($column.ColumnName) } foreach ($row in $temptable.rows) { $table.ImportRow($row) } $table } else { [PSCustomObject]@{ Server = $server.name Database = $db.name Count = $db.ExecuteWithResults("DBCC LOGINFO").Tables.Rows.Count } } } catch { Write-Exception $_ Write-Warning "Unable to query $($db.name) on $servername" continue } } } } } |