摘自:
Passwords Are Not Working After Upgrading To 12c From 10g (文档 ID 2286646.1)
In 11g it uses SHA1 password based version and 10g uses DES based version. In 12c uses SHA-2-based SHA-512 password version
In 11g it uses SHA1 password based version and 10g uses DES based version. In 12c uses SHA-2-based SHA-512 password version
