dbatools

1.1.31

internal/functions/Test-DbaLsnChain.ps1

                                function Test-DbaLsnChain {

    <#

    .SYNOPSIS

        Checks that a filtered array from Get-FilteredRestore contains a restorabel chain of LSNs

    .DESCRIPTION

        Finds the anchoring Full backup (or multiple if it's a striped set).

        Then filters to ensure that all the backups are from that anchor point (LastLSN) and that they're all on the same RecoveryForkID

        Then checks that we have either enough Diffs and T-log backups to get to where we want to go. And checks that there is no break between

        LastLSN and FirstLSN in sequential files

    .PARAMETER FilteredRestoreFiles

        This is just an object consisting of the output from Read-DbaBackupHeader. Normally this will have been filtered down to a restorable chain

        before arriving here. (ie; only 1 anchoring Full backup)

    .NOTES

        Author: Stuart Moore (@napalmgram), stuart-moore.com

        Tags:

        dbatools PowerShell module (https://dbatools.io)

       Copyright: (c) 2018 by dbatools, licensed under MIT

        License: MIT https://opensource.org/licenses/MIT

    .EXAMPLE

        Test-DbaLsnChain -FilteredRestoreFiles $FilteredFiles

        Checks that the Restore chain in $FilteredFiles is complete and can be fully restored

    #>

    [CmdletBinding()]

    param (

        [parameter(Mandatory, ValueFromPipeline)]

        [object[]]$FilteredRestoreFiles,

        [switch]$Continue,

        [switch]$EnableException

    )

    begin {

        #Need to anchor  with full backup:

        $TestHistory = @()

    }

    process {

        foreach ($bh in $FilteredRestoreFiles) {

            $TestHistory += $bh

        }

    }

    end {

        if ($continue) {

            return $true

        }

        Write-Message -Level Verbose -Message "Testing LSN Chain"

        if ($null -eq $TestHistory[0].BackupTypeDescription) {

            $TypeName = 'Type'

        } else {

            $TypeName = "BackupTypeDescription"

        }

        Write-Message -Level VeryVerbose -Message "Testing LSN Chain - Type $typename"

        $FullDBAnchor = $TestHistory | Where-Object { $_.$TypeName -in ('Database', 'Full') }

        if (($FullDBAnchor | Group-Object -Property FirstLSN | Measure-Object).Count -ne 1) {

            $cnt = ($FullDBAnchor | Group-Object -Property FirstLSN | Measure-Object).Count

            foreach ($tFile in $FullDBAnchor) {

                Write-Message -Level Debug -Message "$($tfile.FirstLsn) - $($tfile.TypeName)"

            }

            Write-Message -Level Verbose -Message "db count = $cnt"

            Write-Message -Level Warning -Message "More than 1 full backup from a different LSN, or less than 1, neither supported"

            return $false

            break;

        }

        #Via LSN chain:

        [BigInt]$CheckPointLSN = ($FullDBAnchor | Select-Object -First 1).CheckPointLSN.ToString()

        [BigInt]$FullDBLastLSN = ($FullDBAnchor | Select-Object -First 1).LastLSN.ToString()

        $BackupWrongLSN = $FilteredRestoreFiles | Where-Object { $_.DatabaseBackupLSN -ne $CheckPointLSN }

        #Should be 0 in there, if not, lets check that they're from during the full backup

        if ($BackupWrongLSN.count -gt 0 ) {

            if (($BackupWrongLSN | Where-Object { [BigInt]$_.LastLSN.ToString() -lt $FullDBLastLSN }).count -gt 0) {

                Write-Message -Level Warning -Message "We have non matching LSNs - not supported"

                return $false

                break;

            }

        }

        $DiffAnchor = $TestHistory | Where-Object { $_.$TypeName -in ('Database Differential', 'Differential') }

        #Check for no more than a single Differential backup

        if (($DiffAnchor.FirstLSN | Select-Object -unique | Measure-Object).count -gt 1) {

            Write-Message -Level Warning -Message "More than 1 differential backup, not supported"

            return $false

            break;

        } elseif (($DiffAnchor | Measure-Object).Count -eq 1) {

            Write-Message -Level VeryVerbose -Message "Found a diff file, setting Log Anchor"

            $TlogAnchor = $DiffAnchor

        } else {

            $TlogAnchor = $FullDBAnchor

        }

        #Check T-log LSNs form a chain.

        $TranLogBackups = $TestHistory | Where-Object { $_.$TypeName -in ('Transaction Log', 'Log') -and $_.DatabaseBackupLSN -eq $FullDBAnchor.CheckPointLSN } | Sort-Object -Property LastLSN, FirstLsn

        for ($i = 0; $i -lt ($TranLogBackups.count)) {

            Write-Message -Level Debug -Message "looping t logs"

            if ($i -eq 0) {

                if ($TranLogBackups[$i].FirstLSN -gt $TlogAnchor.LastLSN) {

                    Write-Message -Level Warning -Message "Break in LSN Chain between $($TlogAnchor.FullName) and $($TranLogBackups[($i)].FullName) "

                    Write-Message -Level Verbose -Message "Anchor $($TlogAnchor.LastLSN) - FirstLSN $($TranLogBackups[$i].FirstLSN)"

                    return $false

                    break

                }

            } else {

                if ($TranLogBackups[($i - 1)].LastLsn -ne $TranLogBackups[($i)].FirstLSN -and ($TranLogBackups[($i)] -ne $TranLogBackups[($i - 1)])) {

                    Write-Message -Level Warning -Message "Break in transaction log between $($TranLogBackups[($i-1)].FullName) and $($TranLogBackups[($i)].FullName) "

                    return $false

                    break

                }

            }

            $i++

        }

        Write-Message -Level VeryVerbose -Message "Passed LSN Chain checks"

        return $true

    }

}

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