ORA Database Error Messages ORA-15068: maximum number of diskgroups string already mounted September 11, 2015 mpbod ORA-15068: maximum number of diskgroups string already mounted Cause: An attempt was made to mount more diskgroups than the instance is capable of mounting at one time. Action: Dismount a mounted diskgroup and retry the command. Back to previous menu Share this:Click to email a link to a friend (Opens in new window)Click to print (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on LinkedIn (Opens in new window)Click to share on Tumblr (Opens in new window)Click to share on Twitter (Opens in new window)Click to share on Pinterest (Opens in new window)Click to share on Reddit (Opens in new window)Click to share on Pocket (Opens in new window)