SqlSizer-MSSQL

1.0.6

Public/Find-RemovalSubset.ps1

                                function Find-RemovalSubset

{

    [cmdletbinding()]

    [outputtype([pscustomobject])]

    param

    (

        [Parameter(Mandatory = $false)]

        [int]$StartIteration = 0,

        [Parameter(Mandatory = $false)]

        [bool]$Interactive = $false,

        [Parameter(Mandatory = $false)]

        [int]$Iteration = -1,

        [Parameter(Mandatory = $false)]

        [int]$MaxBatchSize = -1,

        [Parameter(Mandatory = $true)]

        [string]$SessionId,

        [Parameter(Mandatory = $true)]

        [string]$Database,

        [Parameter(Mandatory = $true)]

        [DatabaseInfo]$DatabaseInfo,

        [Parameter(Mandatory = $true)]

        [SqlConnectionInfo]$ConnectionInfo

    )

    $incomingCache = New-Object "System.Collections.Generic.Dictionary[[string], [string]]"

    function CreateIncomingQueryPattern

    {

        param

        (

            [TableInfo]$table,

            [int]$color

        )

        if ($ConnectionInfo.IsSynapse)

        {

            $result = "DECLARE @SqlSizerCount INT = 0

            " 

        }

        else

        {

            $result = ""

        }

        $tableId = $tablesGroupedByName[$table.SchemaName + ", " + $table.TableName].Id

        foreach ($referencedByTable in $table.IsReferencedBy)

        {

            $fks = $referencedByTable.ForeignKeys | Where-Object { ($_.Schema -eq $table.SchemaName) -and ($_.Table -eq $table.TableName) }

            foreach ($fk in $fks)

            {

                if ([TableInfo2]::IsIgnored($fk.FkSchema, $fk.FkTable, $ignoredTables) -eq $true)

                {

                    continue

                }

                $newColor = $color

                $fkTable = $DatabaseInfo.Tables | Where-Object { ($_.SchemaName -eq $fk.FkSchema) -and ($_.TableName -eq $fk.FkTable) }

                $fkTableId = $tablesGroupedByName[$fk.FkSchema + ", " + $fk.FkTable].Id

                $fkSignature = $structure.Tables[$fkTable]

                $fkProcessing = $structure.GetProcessingName($fkSignature, $SessionId)

                $primaryKey = $referencedByTable.PrimaryKey

                $fkId = $fkGroupedByName[$fk.FkSchema + ", " + $fk.FkTable + ", " + $fk.Name].Id

                if (($null -eq $primaryKey) -or ($primaryKey.Count -eq 0))

                {

                    continue

                }

                #where

                $columns = ""

                $i = 0

                foreach ($pk in $primaryKey)

                {

                    if ($i -gt 0)

                    {

                        $columns += " and "

                    }

                    $columns = $columns + " f.$($pk.Name) = p.Key$i "

                    $i += 1

                }

                $where = " WHERE NOT EXISTS(SELECT 1 FROM $fkProcessing p WHERE $columns) AND EXISTS(SELECT 1 FROM  $processing s WHERE "

                $i = 0

                foreach ($fkColumn in $fk.FkColumns)

                {

                    if ($i -gt 0)

                    {

                        $where += " AND "

                    }

                    $where += " s.Key$i = f.$($fkColumn.Name)"

                    $i += 1

                }

                $where += " AND s.Depth = ##depth## ) "

                $from = " FROM " + $referencedByTable.SchemaName + "." + $referencedByTable.TableName + " f "

                # select

                $columns = ""

                $i = 0

                foreach ($primaryKeyColumn in $primaryKey)

                {

                    if ($columns -ne "")

                    {

                        $columns += ", "

                    }

                    $columns += (Get-ColumnValue -ColumnName $primaryKeyColumn.Name -Prefix "f." -dataType $primaryKeyColumn.dataType) + " as val$i "

                    $i += 1

                }

                $topPhrase = " "

                if ($MaxBatchSize -ne -1)

                {

                    $top = $MaxBatchSize

                }

                if (($null -ne $top) -and ($top -ne -1))

                {

                    $topPhrase = " TOP $($top) "

                }

                $select = "SELECT " + $topPhrase + $columns

                $sql = $select + $from + $where

                $columns = ""

                for ($i = 0; $i -lt $primaryKey.Count; $i = $i + 1)

                {

                    $columns = $columns + "x.val" + $i + ","

                }

                if ($ConnectionInfo.IsSynapse -eq $false)

                {

                    $insert = "DECLARE @SqlSizerCount INT = 0

                    " 

                }

                $insert += " SELECT $columns " + $newColor + " as Color, $tableId as TableId, ##depth## + 1 as Depth, $fkId as FkId, ##iteration## as Iteration INTO #tmp FROM (" + $sql + ") x SET @SqlSizerCount = @@ROWCOUNT "

                $insert += " INSERT INTO $fkProcessing SELECT * FROM #tmp "

                if ($MaxBatchSize -ne -1)

                {

                    # reset operation if MaxBatchSize limit is reached

                    $insert += "IF (@SqlSizerCount = $MaxBatchSize)

                                BEGIN

                                    UPDATE SqlSizer.Operations SET [Status] = NULL WHERE [SessionId] = '$SessionId' AND [Status] = 0 AND [Table] = $($table.Id)

                                END"

                }

                $insert += " INSERT INTO SqlSizer.Operations SELECT $fkTableId, $newColor, @SqlSizerCount, 0, NULL, $tableId, $fkId, ##depth## + 1, GETDATE(), NULL, '$SessionId', ##iteration##, NULL"

                $insert += " DROP TABLE #tmp "

                if ($ConnectionInfo.IsSynapse -eq $false)

                {

                    $insert += " 

                    GO 

                    "

                }

                $result += $insert

            }

        }

        return $result

    }

    function HandleIncoming

    {

        param

        (

            [TableInfo]$table,

            [int]$color,

            [int]$iteration,

            [int]$depth

        )

        $key = "$($table.SchemaName)_$($table.TableName)_$($color)"

        if ($incomingCache.ContainsKey($key))

        {   

            $query = $incomingCache[$key]

        }

        else

        {

            $query = CreateIncomingQueryPattern -table $table -color $color

            $incomingCache[$key] = $query

        }

        if ($query -ne "")

        {

            $query = $query.Replace("##iteration##", $iteration)

            $query = $query.Replace("##depth##", $depth)

            $null = Invoke-SqlcmdEx -Sql $query -Database $Database -ConnectionInfo $ConnectionInfo

        }

    }

    function DoSearch()

    {

        param

        (

            [int]$iteration

        )

        Write-Progress -Activity "Finding subset $SessionId" -PercentComplete 0 

        $interval = 5

        $percent = 0

        # Progress handling

        $totalSeconds = (New-TimeSpan -Start $start -End (Get-Date)).TotalSeconds

        if ($totalSeconds -gt ($lastTotalSeconds + $interval))

        {

            $lastTotalSeconds = $totalSeconds

            $progress = Get-SubsetProgress -Database $Database -ConnectionInfo $ConnectionInfo

            $percent = (100 * ($progress.Processed / ($progress.Processed + $progress.ToProcess)))

            Write-Progress -Activity "Finding subset $SessionId" -PercentComplete $percent

        }

        $q = "SELECT TOP 1

                    [Table],

                    [Depth],

                    [Color],

                    SUM([ToProcess] - [Processed]) as [Count]

                FROM

                    [SqlSizer].[Operations]

                WHERE

                    [Status] IS NULL AND [SessionId] = '$SessionId'

                GROUP BY

                    [Table], [Depth], [Color]

                ORDER BY

                    [Depth] ASC, [Count] DESC"

        $operation = Invoke-SqlcmdEx -Sql $q -Database $Database -ConnectionInfo $ConnectionInfo

        if ($null -eq $operation)

        {

            Write-Progress -Activity "Finding subset $SessionId" -Completed

            return $false

        }

        # load node info

        $tableId = $operation.Table

        $color = $operation.Color

        $depth = $operation.Depth

        $tableData = $tablesGroupedById["$($tableId)"]

        $table = $DatabaseInfo.Tables | Where-Object { ($_.SchemaName -eq $tableData.SchemaName) -and ($_.TableName -eq $tableData.TableName) }

        $table.Id = $tableId

        Write-Progress -Activity "Finding subset $SessionId" -CurrentOperation  "$($table.SchemaName).$($table.TableName) table is being processed with color $([Color]$color)" -PercentComplete $percent

        $q = "SELECT [Id], [ToProcess], [Processed] FROM [SqlSizer].[Operations] WHERE [Table] = $tableId AND Status IS NULL AND [Color] = $color AND [Depth] = $depth AND [SessionId] = '$SessionId'"

        $operations = Invoke-SqlcmdEx -Sql $q -Database $Database -ConnectionInfo $ConnectionInfo

        if ($MaxBatchSize -eq -1)

        {

            foreach ($operation in $operations)

            {

                $q = "UPDATE [SqlSizer].[Operations] SET Status = 0, Processed = ToProcess WHERE Id = $($operation.Id)"

                $null = Invoke-SqlcmdEx -Sql $q -Database $Database -ConnectionInfo $ConnectionInfo

            }

        }

        else

        {

            $tmp = $MaxBatchSize

            foreach ($operation in $operations)

            {   

                if ($tmp -gt 0)

                {

                    $diff = $operation.ToProcess - $operation.Processed

                    if ($diff -gt $tmp)

                    {

                        $q = "UPDATE [SqlSizer].[Operations] SET Status = 0, Processed = Processed + $tmp WHERE Id = $($operation.Id)"

                        $tmp  = 0

                    }

                    else

                    {

                        if ($operation.ToProcess -ge ($operation.Processed + $diff))

                        {

                            $q = "UPDATE [SqlSizer].[Operations] SET Status = 0, Processed = Processed + $diff WHERE Id = $($operation.Id)"

                        }

                        else

                        {

                            $q = "UPDATE [SqlSizer].[Operations] SET Status = 0, Processed = ToProcess  WHERE Id = $($operation.Id)"

                        }

                        $tmp -= $diff

                    }

                    $null = Invoke-SqlcmdEx -Sql $q -Database $Database -ConnectionInfo $ConnectionInfo

                }

            }

        }

        $signature = $structure.Tables[$table]

        $processing = $structure.GetProcessingName($signature, $SessionId)

        HandleIncoming -table $table -color $color -iteration $iteration -depth $depth

        # mark operations as processed

        $q = "UPDATE SqlSizer.Operations SET Status = NULL WHERE Status = 0 AND ToProcess <> Processed AND [SessionId] = '$SessionId'"

        $null = Invoke-SqlcmdEx -Sql $q -Database $Database -ConnectionInfo $ConnectionInfo

        $q = "UPDATE SqlSizer.Operations SET Status = 1, ProcessedIteration = $iteration, ProcessedDate = GETDATE() WHERE Status = 0 AND [SessionId] = '$SessionId'"

        $null = Invoke-SqlcmdEx -Sql $q -Database $Database -ConnectionInfo $ConnectionInfo

        return $true

    }

    # get meta data

    $structure = [Structure]::new($DatabaseInfo)

    $sqlSizerInfo = Get-SqlSizerInfo -Database $Database -ConnectionInfo $ConnectionInfo

    $tablesGroupedById = $sqlSizerInfo.Tables | Group-Object -Property Id -AsHashTable -AsString

    $tablesGroupedByName = $sqlSizerInfo.Tables | Group-Object -Property SchemaName, TableName -AsHashTable -AsString

    $fkGroupedByName = $sqlSizerInfo.ForeignKeys | Group-Object -Property FkSchemaName, FkTableName, Name -AsHashTable -AsString

    if ($false -eq $Interactive)

    {

        $null = Initialize-OperationsTable -SessionId $SessionId -Database $Database -ConnectionInfo $ConnectionInfo -DatabaseInfo $DatabaseInfo -StartIteration $StartIteration

        $start = Get-Date

        $iteration = $StartIteration + 1

        do

        {

            $result = DoSearch -iteration $iteration

            $iteration = $iteration + 1

        }

        while ($result -eq $true)

        return [pscustomobject]@{

            Finished            = $true

            Initialized         = $true

            CompletedIterations = $iteration - $StartIteration

        }

    }

    else

    {

        if ($Iteration -eq 0)

        {

            $null = Initialize-OperationsTable -SessionId $SessionId -Database $Database -ConnectionInfo $ConnectionInfo -DatabaseInfo $DatabaseInfo -StartIteration $StartIteration

            return [pscustomobject]@{

                Finished            = $false

                Initialized         = $true

                CompletedIterations = 1

            }

        }

        else

        {

            $start = Get-Date

            $result = DoSearch -iteration $Iteration

            return [pscustomobject]@{

                Finished            = $result -eq $false

                Initialized         = $true

                CompletedIterations = 1

            }

        }

    }

}

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