======Overview======
Upgrade of Oracle Grid Infrastructure is needed in case your database is RAC database and you wish to upgrade it to a higher version. Furthermore, the upgrade is done in completely online fashion for the database, since each node is patched individually and thus the database remains online.

====Upgrade 12.1.0.2 -> 12.2.0.1====

  * [[oracle_gdid_sa_upgrade_frstNode| Upgrade First Node]]
  * [[oracle_grid_sa_upgrade_scndNode| Upgrade Second Node]]


====Upgrade 12.2.0.1 -> 12.2.0.2====
As soon as I have time :)