ORA Database Error Messages ORA-00209: control file blocksize mismatch, check alert log for more info May 22, 2015 mpbod ORA-00209: control file blocksize mismatch, check alert log for more info Cause: The block size in the control file header does not match the size specified in the DB_BLOCK_SIZE parameter. Action: Look at the alert log for more information. 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)