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I tried to update new (i.e. not upgraded from V7 or anything) Umbraco 8.5.3 installation and database and received the following error message:
An explicit DROP INDEX is not allowed on index 'umbracoRelationType.IX_umbracoRelationType_alias'. It is being used for UNIQUE KEY constraint enforcement.
Is this a known issue? Do I need to fiddle with the database now?
I manually dropped the unique index and then the upgrade routine went through successfully. When I wanted to re-create the index afterwards, I was given another error message because there now is a non-unique index of the same name. I find a non-unique index for an alias a bit strange.
Interestingly I did an upgrade yesterday from the exact same version. It was a pretty empty site thought. Haven't had any issues.
Any specialties in your site?
I did the update today and I have ran into the same issue, I'm not sure if I should remove the constraint.
How did you get around this?
Update, well I did change the constraing to index from unique and the upgrade went ahead and finished. It seems to be working for now but I will have to test everything to make sure nothing major crashes.
Would appreciate some input on this.
I'm experiencing this very issue too on my dev site.
Attempted a 8.4.0 to 8.6.1 upgrade yesterday which produced this error.
Rolled back to 8.4.0, then upgraded to 8.5.5 which worked fine, but when attempting to go from 8.5.5 to 8.6.0 / 8.6.1, I once again receive this error.
Will stay on 8.5.5 for time being, and perhaps try a 8.6.x upgrade on another of my dev sites later this week.
Yea I did the same. Cannot go to 8.6 dropping thr constraint does work but i dont know what it could cause down the line
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