1. Double Click the  Role on the Search DB , For eg. SPSearchDBAdmin
2. Set the Owner as dbo role rather than the service account Domain\ServiceAccount as seen in ULS logs accordingly .

Failed to upgrade SharePoint Products.

This is a critical task. You have to fix the failures before you can continue. Follow this link for more information about how to troubleshoot upgrade failures: https://go.microsoft.com/fwlink/?LinkId=259653

An exception of type Microsoft.SharePoint.PostSetupConfiguration.PostSetupConfigurationTaskException was thrown. Additional exception information:

Feature upgrade action 'CustomUpgradeAction.AddSwitchField' threw an exception upgrading Feature 'CustomTiles' (Id: 15/'68642d38-a556-4384-888c-082844fbf224') in WebApplication 'SharePoint - 80: List |0

Feature upgrade incomplete for Feature 'CustomTiles' (Id: 15/'68642d38-a556-4384-888c-082844fbf224') in WebApplication 'SharePoint - 80. Exception: List |0

Upgrade completed with errors. Review the upgrade log file located in C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\16\LOGS\Upgrade-20180220-162221-353-19435b7e3e40479183e3ca8d9f3155fa.log. The number of errors and warnings is listed

To diagnose the problem, review the application event log and the configuration log file located at:C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\16\LOGS\PSCDiagnostics_2_20_2018_16_22_10_998_970437191.log

Get-SPServiceApplicationProxy #copy the ID of UPA proxy
$upaProxy = Get-SPServiceApplicationProxy 
Move-SPSocialComment -ProfileServiceApplicationProxy $upaProxy -OldUrl "https://sp2013.contoso.com/SitePages/Comments_test.aspx" -NewUrl "https://sp2016.contoso.com/SitePages/Comments_test.aspx"

Pre-requisites : Configure User profile service application : https://technet.microsoft.com/en-us/library/ee721052(v=office.16).aspx

Configure Mysites : https://technet.microsoft.com/en-us/library/ee624362(v=office.16).aspx

Configure Search Service application : https://technet.microsoft.com/en-in/library/gg502597(v=office.16).aspx

In my test case , the Mysite web app and Mysite host URL is : https://sp:28309/

Now, lets start the configuration.

1. Create Compliance Policy Center :

You will need to create a site collection on the same web application as the MysiteHost. The Site template should be selected as "Compliance Policy Center" (Under enterprise templates) . You can use UI method or PowerShell commands to create the site.

In My case, the Compliance policy center URL is https://sp:28309/sites/CompliancePolicyCenter

    $webApp=Get-SPwebApplication https://sp:28309
    $webApp.Properties["PolicyCenterUrl"]="https://sp:28309/sites/CompliancePolicyCenter"
    $webApp.update()
    $webApp.Properties

To check the property value
    $web=Get-spweb https://sp:28309/personal/contoso_spfarm/
    $web.AllProperties["ip_lastcompliancepolicyprocesstime”]

To reset the value to an older date: (Execute this only if the value shows within 7 days from today) 
    $web=Get-spweb https://sp:28309/personal/contoso_spfarm/
    $ResetDate=(Get-date).AddDays(-10)
    $modifieddate=(Get-date $ResetDate -Format "MM/dd/yyyy hh:mm:ss tt")
    $Updatedate= (Get-Date $modifieddate).ToString("MM/dd/yyyy hh:mm:ss tt")
    $web.AllProperties["ip_lastcompliancepolicyprocesstime”]=$Updatedate
    $web.update()
    $web.AllProperties["ip_lastcompliancepolicyprocesstime”]

$MysiteWebApp ="https://sp:28309"
$PolicySiteCollection="https://sp:28309/sites/CompliancePolicyCenter"

$snapin = Get-PSSnapin | Where-Object {$_.Name -eq 'Microsoft.SharePoint.Powershell'}
if ($snapin -eq $null)
{
Write-Host "Loading SharePoint Powershell Snapin" -ForegroundColor Green
Add-PSSnapin "Microsoft.SharePoint.Powershell"
}

$WebApp=get-spwebapplication $MysiteWebApp
$sites = $WebApp.sites
$Policyweb=get-spweb $PolicySiteCollection
$Darlist=$policyweb.lists["Dar Tasks"]

Write-host "Running History cleanup.." -ForegroundColor Yellow

foreach($item in $Darlist.Items)
{
$Darlist.getitembyid($item.id).delete()
}
Write-host "Finished History cleanup.." -ForegroundColor Green
write-host " "

Write-host "Setting the Web property value.. This may take more time depending on the number of mysites you have. " -ForegroundColor Yellow
write-host "****************************************"
foreach ($site in $sites)
{
$web=Get-spweb $site.url

if ($site.url -match "/personal/")
{
$ResetDate=(Get-date).AddDays(-10)
$modifieddate=(Get-date $ResetDate -Format "MM/dd/yyyy hh:mm:ss tt")
$Updatedate= (Get-Date $modifieddate).ToString("MM/dd/yyyy hh:mm:ss tt")
$web.AllProperties["ip_lastcompliancepolicyprocesstime”]=$Updatedate
write-host "Web URL : " $site.url -foregroundcolor magenta
write-host "Property value : " $web.AllProperties["ip_lastcompliancepolicyprocesstime”]-foregroundcolor magenta
write-host " "
$web.Update()
}
}

write-host "****************************************"
Write-host "Setting the Web property value completed. " -ForegroundColor Green
write-host " "

Write-host "Executing the Dar Tasks House Keeping Job" -ForegroundColor Yellow
$HouseKeepingJob=Get-SPTimerJob | where {$_.typename -eq "Microsoft.Office.CompliancePolicy.SharePoint.Internal.DarTaskHouseKeepingJobDefinition" -and $_.webapplication -match "Mysite"}
$HouseKeepingJob.RunNow()
sleep 60
write-host "Completed..." -ForegroundColor Green
write-host " "

Write-host "Executing the Dar Processing Job" -ForegroundColor Yellow
$DarprocessingJob=Get-SPTimerJob | where {$_.typename -eq "Microsoft.Office.CompliancePolicy.SharePoint.Internal.DarProcessingJobDefinition" -and $_.webapplication -match "Mysite"}
$DarprocessingJob.runNow()
Sleep 60
write-host "Completed..." -ForegroundColor Green
write-host " "

Write-host "Executing the Compliance Policy Processing Job" -ForegroundColor Yellow
$ComplianPolicyProcessingJob=Get-SPTimerJob | where {$_.typename -eq "Microsoft.Office.CompliancePolicy.SharePoint.Internal.PolicyProcessingJobDefinition" -and $_.webapplication -match "Mysite"}
$ComplianPolicyProcessingJob.RunNow()
Sleep 60
write-host "Completed..." -ForegroundColor Green

$site = Get-SPSite https://sp/sites/recordcentertest
$site.Features["063c26fa-3ccc-4180-8a84-b6f98e991df3"]

$site = get-spsite https://sp/sites/RecordsCenterTest      //Change it to your site collection url

$web = get-spweb https://sp/sites/RecordsCenterTest    //Change it to your site collection url

$list = $web.lists["TestDocForMoving"]                        // Change it to your library name

$list > C:\listschema.txt                                            //Change the filename accordingly

$web=Get-SPWeb https://sp:90/sites/Test/subsite

$list = $web.Lists['Listname']

$ct2=$list.ContentTypes['contenttype name']

$ct2.Fields | ?{$_.internalname -match '_dlc_ExpireDate'}

 $pr= Get-SPUsageDefinition | where {$_.Name -like "Page Requests"}
 $pr.DaysToKeepUsageFiles=0
 $pr.EnableReceivers=$true
 $pr.Update()