Password complexity checking. In a default installation, Oracle Databaseprovides the ora12c_verify_function and ora12c_strong_verify_functionpassword verification functions to ensure that new or changed passwords aresufficiently complex to prevent intruders who try to break into the system byguessing passwords. You must manually enable password complexity checking.You can further customize the complexity of your users’ passwords. See "AboutPassword Complexity Verification" on page 3-13 for more information.