On a master site the following process is needed to have replication running.
The process Replication_SYS.Process_Replicate__ monitors the
replication queue and starts background jobs that creates connectivity messages
containing replicated data.
The process Connectivity_SYS.Process_Outbox__ monitors the out
message box and starts background jobs that handles messages.
The process(es) Transaction_SYS.Process_All_Pending__ executes
the background jobs entered into the background job queue. The number of
processes can be configured in Batch Queue Administration.
On a slave site the following process is needed to have replication running.
The process Connectivity_SYS.Process_Inbox__ monitors the in
message box and starts background jobs that handles messages.