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What is the difference between having only the db_owner database role and having all other except db_denydatareader and db_denydatawriter?

db_securityadmin + db_accessadmin + db_backupoperator + db_ddladmin + db_datareader + db_datawriter

Versus

db_owner

I've read that when you have db_accessadmin and db_securityadmin roles, you can change database role of another user into the database but I tried and it seems that I don't have the permission to change any permission while logged with this user. But if I give to this user the db_owner role, now I can change permission to any other user.

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  • Both of your cases above have db_owner, though. db_owner > db_securityadmin. db_securityadmin can modify role membership for custom roles only. – scsimon Jul 25 '19 at 20:34
  • Hummm, sorry I really missed while creating a use case and taking screenshots; the first picture should not have the db_owner checked. I will modify my screenshot as soon as possible. Thanks! – Samuel Jul 25 '19 at 20:58
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As per the Docs article, db_owner can perform functions that no other role or combination of roles provides, including but not limited to:

  • Adding users to fixed-database roles
  • Dropping the database
  • The CONTROL DATABASE permission

There is a diagram on the linked article that shows the fixed-role permissions for each role. Any permission not listed in that diagram is granted to the db_owner role only by default.

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The description here will show you exactly what the differences are.

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