Problem Explanation:
Oracle cannot write to the alert_.log file because the ownership and/or permissions on the BACKGROUND_DUMP_DEST directory are incorrect.
Solution Description:
To allow oracle to write to the BACKGROUND_DUMP_DEST directory (contains alert_.log), modify the ownership of directory BACKGROUND_DUMP_DESTso that the oracle user (software owner) is the owner and make thepermissions on directory BACKGROUND_DUMP_DEST 755.