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Attempting to delete a domain on the Administration Console;

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Leave Force Delete* unchecked. (*only available from v8.0.6)

Click Yes on the Confirm pop-up.

However However, the following error appears:

This usually means the domain is still tied to something else, for example, a realm, a policy, a role, etc

Search the Admin Console for Domain Bindings

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If you see the domain you wish to delete listed in any of the above place places, then you will need to edit and remove those associations, then try deleting the domain again.

If however, you cannot find it in any of those locations, then it the domain will need to be manually removed using a series of SQL queriesremoved by the following methods:

Force delete (only available from version 8.0.6 upwards)

If you cannot find any domain binding, and you are 100% sure the domain is still not in use, then you can force delete.  Attempt to delete the domain again.

Enable the option to force delete:

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 Take note of the yellow warning, and if you are happy, click Yes

The domain will be removed.

The rest of this wiki will no longer apply.

Remove using SQL Queries (older versions of DualShield)

Go to Platform>Database Servers  then click on the blue SQL Console button on the top right.

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delete from role_domain where domain_id = 5

Hopefully, you will see 1 row affected, which means that the query has executed correctly and the reference to the domain has been deleted from this table

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Unfortunately, that query returns the following error...

...because there is a row in in ldap_group that is referencing the id in a row of the usergroup table we need to delete.  Therefor taht that row in the the ldap_group table needs to be deleted first.

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DELETE lg FROM ldap_group lg
JOIN usergroup ug ON lg.id = ug.id
WHERE ug.domain_id = 5;

Once the above query has been executed successfully, can you then run..

delete from usergroup where domain_id = 5

However, that may not be the end because there may be another table referencing rows on usergroup

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Here you can use the same join query as above hiowever changing the table name in the first line to match the table name stated in the error above (tbl_policy), and make sure the column name on the second line is changed to group_id

DELETE tp FROM tbl_policy tp
JOIN usergroup ug ON tp.group_id = ug.id
WHERE ug.domain_id = 5;

If you then encounter a third level key constraint issue such as 

Cannot delete or update a parent row: a foreign key constraint fails (`dualshield`.`tbl_policy_applications`, CONSTRAINT `FK61B4ED0FB3470AD4` FOREIGN KEY (`policy_id`) REFERENCES `tbl_policy` (`id`) ON DELETE RESTRICT ON UPDATE RESTRICT) 

Then you need to run a query that links all three tables together to find and delete the applications tied to the policies that belong to domain_id 5:

DELETE tpa FROM tbl_policy_applications tpa
JOIN tbl_policy tp ON tpa.policy_id = tp.id
JOIN usergroup ug ON tp.group_id = ug.id
WHERE ug.domain_id = 5;

If successful, you need to then run the previous query (DELETE tp FROM tbl_policy tp...)  followed by the query before that (delete from usergroup...) until you get back to the first query (delete from domain where name = ...)

You need to follow the pattern above until the first query to delete the domain executes successfully.