# Activity (The Invisible Staff) ![[assets/wl_activity.png|256]] When you see an **Activity** wait event, the elephant is waiting on the background processes that keep the Cafe running. These are the "Invisible Staff" who maintain the Depot while the waiters are actually taking orders. If these events are high, it usually means the background workers are struggling to keep up with the workload from the main Cafe. --- ![[Workloads/Activity/Maintenance/_Maintenance]] --- ![[Workloads/Activity/Replication/_Replication]] --- ![[Workloads/Activity/Logical/_Logical]]