tuned lacks oracle profile. How could I switch to it?
Looking at tuned-adm oracle's documentation, I've found the next:


  oracle   A profile optimized for Oracle databases loads based on
  throughput-performance profile. It additionaly disables
  transparent huge pages and modifies some other performance related
  kernel parameters. This profile is provided by
  tuned-profiles-oracle package. It is available in Red Hat
  Enterprise Linux 6.8 and later.


So, the installation of the tuned-profiles-oracle package solved this issue:

# yum install tuned-profiles-oracle

# tuned-adm profile oracle

# tuned-adm active



Current active profile: oracle
Service tuned: enabled, running
Service ktune: enabled, running