How audited sessions are collected and stored
The agent on each audited computer captures user activity and forwards it to a collector on a Windows computer. If the agent cannot connect to a collector—for example, because all of the computers hosting the collector service for the agent are shut down for maintenance—the agent spools the session data locally and transfers it to a collector later. The collector sends the data to an audit store server, where the audit data is stored in the Microsoft SQL Server database that you have designated as the active audit store. As you accumulate data, you can add more SQL Server databases to the audit store to hold historical information or to change the database designated as the active audit store database.
When an administrator or auditor uses the Audit Analyzer console to request session data, the audit management server retrieves it from the appropriate audit store.
The following figure illustrates the basic architecture and flow of data with a minimum number of audit and monitoring service components installed.
In the illustration, each agent connects to one collector. In a production environment, you can configure agents to allow connections to additional collectors for redundancy and load balancing or to prevent connections between specific agents and collectors. You can also add audit stores and configure which connections are allowed or restricted. The size and complexity of the auditing infrastructure depends on how you want to optimize your network topology, how many computers you are audit and monitoring service, how much audit data you want to collect and store, and how long you plan to retain audit records.