in bidirectional replication setup can we upgrade one by one side for 21c
We are having 3 way GG setup ACTIVE-ACTIVE-ACTIVE in three data center , planning to upgrade from 19c to 21c , using integrated extract and replicate processes. How do we upgrade from 19c to 21c , can we do one data center first and later one by one .
will this cause any trail file version issue ?
How do we upgrade from 19c to 21c?
Database version is 19c