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 replica 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.