DRG Database Error Messages DRG-12300: an index with this column list already exists in the index set December 10, 2019 mpbod DRG-12300: an index with this column list already exists in the index set Cause: You tried to add an index to an index set, but an index with the specified column list already exists Action: none Back to previous menu https://support.oracle.com/ http://www.oracle.com/ 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)