ORA Database Error Messages ORA-16783: instance string not open for read and write access October 11, 2015 mpbod ORA-16783: instance string not open for read and write access Cause: The instance was left in a mounted mode and was not open for read and write access. Action: Open the instance manually or by reenabling the database through the Data Guard broker. 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)