Answer
This generally indicates the database's shared pool is undersized for the new environment/workload after the copy — the exact fix depends on which Oracle memory-management mode is actually in effect. Check the current values of shared_pool_size, sga_target, sga_max_size, memory_target, memory_max_target, pga_aggregate_target, and pga_aggregate_limit to determine whether the environment is using fully Manual sizing, Automatic Shared Memory Management, or fully Automatic Memory Management, and increase whichever of these parameters is actually governing the shared pool under that specific mode — simply bumping shared_pool_size directly won't help if Automatic Memory Management is actually in control of sizing it dynamically from a different parameter.