TNS Database Error Messages TNS-00303: Connection Manager: Reread parameter data October 9, 2020 mpbod TNS-00303: Connection Manager: Reread parameter data Cause: Request sent by control manager to control programming indicating that parameter data was read. Action: No action required. 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)