The E-Business Suite Technology Codelevel Checker (ETCC) tool helps you identify application tier or database tier patches that need to be applied to your Oracle E-Business Suite Release 12.2 system.
The ETCC tool was designed to be self-documenting; however, you can read about it in the following document:
ETCC has been updated to include bug fixes and patching combinations for the following recommended versions:Database
We recommend always using the latest version of ETCC, as new bugfixes will not be checked by older versions of the utility. The latest version of the ETCC tool can always be downloaded via Patch 17537119 from My Oracle Support.