ORA Database Error Messages ORA-01987: client os username is too long June 11, 2015 mpbod ORA-01987: client os username is too long Cause: A client’s os username is too long for the os logon to succeed. Action: Use a shorter os username. 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)