Improved and more efficient techniques are described for reducing the amount of work that needs to be performed by a database in a computer network in order to distribute event summary data to a large number of administrator clients. Delays experienced by event data at a database, e.g., due to delays in accessing a database, are reduced so that client can be notified of the events as soon as possible. Furthermore, event data obtained from both local and remote networks is efficiently coordinated using replica and union processes. Each monitoring location in the network includes both locally generated events, and a copy of remotely-generated events which are provided and maintained by one or more remote monitoring locations. The monitoring locations update one another with their event data.