functions/Invoke-DbaDbClone.ps1
|
function Invoke-DbaDbClone { <# .SYNOPSIS Clones a database schema and statistics .DESCRIPTION Clones a database schema and statistics. This can be useful for testing query performance without requiring all the space needed for the data in the database. Read more at sqlperformance: https://sqlperformance.com/2016/08/sql-statistics/expanding-dbcc-clonedatabase Thanks to Microsoft Tiger Team for the code and idea https://github.com/Microsoft/tigertoolbox/ .PARAMETER SqlInstance Allows you to specify a comma separated list of servers to query. .PARAMETER SqlCredential Login to the target instance using alternative credentials. Windows and SQL Authentication supported. Accepts credential objects (Get-Credential) .PARAMETER Database The database to clone - this list is auto-populated from the server. .PARAMETER CloneDatabase The name(s) to clone to. .PARAMETER UpdateStatistics Update the statistics prior to cloning (per Microsoft Tiger Team formula) .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: Statistics, Performance Website: https://dbatools.io Copyright: (C) Chrissy LeMaire, clemaire@gmail.com License: MIT https://opensource.org/licenses/MIT .LINK https://dbatools.io/Invoke-DbaDbClone .EXAMPLE Invoke-DbaDbClone -SqlInstance sql2016 -Database mydb -CloneDatabase myclone Clones mydb to myclone on sql2016 .EXAMPLE Invoke-DbaDbClone -SqlInstance sql2016 -Database mydb -CloneDatabase myclone, myclone2 -UpdateStatistics Updates the statistics of mydb then clones to myclone and myclone2 #> [CmdletBinding()] param ( [parameter(Position = 0)] [Alias("ServerInstance", "SqlServer", "SqlServers")] [DbaInstanceParameter[]]$SqlInstance, [PSCredential]$SqlCredential, [parameter(Mandatory, ValueFromPipeline)] [object]$Database, [string[]]$CloneDatabase, [switch]$UpdateStatistics, [Alias('Silent')] [switch]$EnableException ) begin { if (-not $Database.Name -and -not $SqlInstance) { Stop-Function -Message "You must specify a server name if you did not pipe a database" } $updatestats = "declare @out table(id int identity(1,1),s sysname, o sysname, i sysname, stats_stream varbinary(max), rows bigint, pages bigint) declare @dbcc table(stats_stream varbinary(max), rows bigint, pages bigint) declare c cursor for select object_schema_name(object_id) s, object_name(object_id) o, name i from sys.indexes where type_desc in ('CLUSTERED COLUMNSTORE', 'NONCLUSTERED COLUMNSTORE') declare @s sysname, @o sysname, @i sysname open c fetch next from c into @s, @o, @i while @@FETCH_STATUS = 0 begin declare @showStats nvarchar(max) = N'DBCC SHOW_STATISTICS(""' + quotename(@s) + '.' + quotename(@o) + '"", ' + quotename(@i) + ') with stats_stream' insert @dbcc exec sp_executesql @showStats insert @out select @s, @o, @i, stats_stream, rows, pages from @dbcc delete @dbcc fetch next from c into @s, @o, @i end close c deallocate c declare @sql nvarchar(max); declare @id int; select top 1 @id=id,@sql= 'UPDATE STATISTICS ' + quotename(s) + '.' + quotename(o) + '(' + quotename(i) + ') with stats_stream = ' + convert(nvarchar(max), stats_stream, 1) + ', rowcount = ' + convert(nvarchar(max), rows) + ', pagecount = ' + convert(nvarchar(max), pages) from @out WHILE (@@ROWCOUNT <> 0) BEGIN exec sp_executesql @sql delete @out where id = @id select top 1 @id=id,@sql= 'UPDATE STATISTICS ' + quotename(s) + '.' + quotename(o) + '(' + quotename(i) + ') with stats_stream = ' + convert(nvarchar(max), stats_stream, 1) + ', rowcount = ' + convert(nvarchar(max), rows) + ', pagecount = ' + convert(nvarchar(max), pages) from @out END" } process { if (Test-FunctionInterrupt) { return } foreach ($instance in $SqlInstance) { Write-Message -Level Verbose -Message "Connecting to $instance" try { $server = Connect-SqlInstance -SqlInstance $instance -SqlCredential $SqlCredential -MinimumVersion 12 } catch { Stop-Function -Message "Failure" -Category ConnectionError -ErrorRecord $_ -Target $instance -Continue } $sql2012min = [version]"11.0.7001.0" # SQL 2012 SP4 $sql2014min = [version]"12.0.5000.0" # SQL 2014 SP2 $sql2016min = [version]"13.0.4001.0" # SQL 2016 SP1 if ($server.VersionMajor -eq 11 -and $server.Version -lt $sql2012min) { Stop-Function -Message "Unsupported version for $instance. SQL Server 2012 SP4 and above required." -Target $server -Continue } if ($server.VersionMajor -eq 12 -and $server.Version -lt $sql2014min) { Stop-Function -Message "Unsupported version for $instance. SQL Server 2014 SP2 and above required." -Target $server -Continue } if ($server.VersionMajor -eq 13 -and $server.Version -lt $sql2016min) { Stop-Function -Message "Unsupported version for $instance. SQL Server 2016 SP1 and above required." -Target $server -Continue } if (-not $Database.Name) { [Microsoft.SqlServer.Management.Smo.Database]$database = $server.Databases[$database] } if ($Database.IsSystemObject) { Stop-Function -Message "Only user databases are supported" -Target $instance -Continue } if (-not $Database.name) { Stop-Function -Message "Database not found" -Target $instance -Continue } if ($UpdateStatistics) { try { Write-Message -Level Verbose -Message "Updating statistics" $null = $database.Query($updatestats) } catch { Stop-Function -Message "Failure" -ErrorRecord $_ -Target $server -Continue } } $dbname = $database.Name foreach ($db in $CloneDatabase) { Write-Message -Level Verbose -Message "Cloning $db from $database" if ($server.Databases[$db]) { Stop-Function -Message "Destination clone database $db already exists" -Target $instance -Continue } else { try { $sql = "dbcc clonedatabase('$dbname','$db')" $null = $database.Query($sql) $server.Databases.Refresh() Get-DbaDatabase -SqlInstance $server -Database $db } catch { Stop-Function -Message "Failure" -ErrorRecord $_ -Target $server -Continue } } } } } end { Test-DbaDeprecation -DeprecatedOn "1.0.0" -EnableException:$false -Alias Invoke-DbaDatabaseClone } } |