How is data safety ensured during Oracle database migration?

Core process: full backup with verified restore before migration; official tools such as Data Pump or RMAN instead of third-party ones; full post-migration verification (row counts, MD5 checks, business logic checks); and a planned maintenance window for the cutover with a final backup beforehand. ZhongLianDa has delivered dozens of Oracle migrations covering same-version, cross-version upgrade and heterogeneous platform scenarios.