Cannot delete SharePoint web application again

Question

While deleting web application
Central admin gives error: 
Sorry, something went wrong
An object in the SharePoint administrative framework, "SPWebApplication Name=ShareAppsUAT", could not be deleted because other objects depend on it.  Update all of these dependants to point
to null or different objects and retry this operation.  The dependant objects are as follows: correlation id
ULS log shows following error
Unknown SQL Exception 547 occurred. Additional error information from SQL Server is included below.  The
DELETE statement conflicted with the REFERENCE constraint "FK_SiteMap_Application". The conflict occurred in database "SharePoint2013UATEnterprise_Config", table "dbo.SiteMap", column 'ApplicationId'.  Table 'LastUpdate'.
Scan count 0, logical reads 2, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.  The statement has been terminated.
I had similar thread https://social.technet.microsoft.com/Forums/sharepoint/en-US/74e06180-f066-47e0-8895-3e909206b9e9/cannot-delete-sharepoint-web-application?forum=sharepointgeneral
The only difference is error in central admin. Before for another web application i got
Object not set to a reference of an object. now i am getting An object in the SharePoint administrative framework, "SPWebApplication Name=ShareAppsUAT", could not be deleted because other objects depend on it.  Update all of these
dependants to point to null or different objects and retry this operation.  The dependant objects are as follows: in both powershell and central admin. 
Solution in above thread gives following error for this case
Exception calling "Delete" with "0" argument(s): "An object in the SharePoint administrative framework, could not be deleted because other objects depend on it. Update all of these dependa nts to point to null or different objects
and retry this operation. The depend ant objects are as follows: Web Application name.
How to solve it? It is like a loop. If i go to delte web appliction it says content database is dependent object and if i do for content database it says web application is dependent object
Adit

Answer 1

Hi Adit,
From your description, the issue might be caused by orphan items in sitemap.
Please execute command below to check IDs and site map status for all site collections and subsites in the issue content database:
stsadm -o enumallwebs -databasename <database name>
Then use the command below to delete orphan sites:
stsadm -o deletesite -force -siteid <siteid> -databaseserver <database server name> -databasename <database name>
Now run IISReset and try delete web application via:
Remove-SPWebApplication - identity http://sitename
For related information:
http://technet.microsoft.com/en-us/library/dd789634(v=office.12).aspx
http://technet.microsoft.com/en-in/library/cc288016(v=office.12).aspx
http://technet.microsoft.com/en-us/library/ff607891(v=office.15).aspx
Regards,
Rebecca Tu
TechNet Community Support