In R12.2 ETCC is used to check for bug fixes on the DB and Middle Tier. It is required to run the ETCC script on the database tier after each clone as adop check's this as one of its preliminary check's so you may as well keep this one up to date.
Lastest version can be found at 17537119.
Prepare the files to run them
chmod 777 /stage/install/ETCC
unzip p17537119_R12_GENERIC.zip -d /stage/install/ETCC
chmod a+x /stage/install/ETCC/*
Run the script on each of the tier's that the services are running on:
echo $CONTEXT_FILE | /stage/install/ETCC/checkMTpatch.sh
echo $CONTEXT_FILE | /stage/install/ETCC/checkDBpatch.sh