Cisco ISE uses specialized background processes to manage authentication, policy enforcement, system monitoring, and database synchronization. By understanding these services, you can troubleshoot issues, tune performance, and maintain the stability of your deployment.

This table lists the Cisco ISE processes and their service impact.

Process name	Description	Service impact
Database listener	Oracle Enterprise Database listener	You must ensure that this process is running for all services to work properly.
Database server	Oracle Enterprise Database server, which stores both configuration and operational data	You must ensure that this process is running for all services to work properly.
Application server	Main Tomcat server for Cisco ISE	You must ensure that this process is running for all services to work properly.
Profiler database	Redis database for Cisco ISE profiling service	You must ensure that this process is running for all services to work properly.
AD connector	Active Directory runtime	You must ensure that this process is running for all services to work properly.
MnT session database	Oracle TimesTen Database for monitoring and troubleshooting (MnT) service	You must ensure that this process is running for all services to work properly.
MnT log collector	Log collector for MnT service	You must ensure that this process is running to support MnT operational data.
MnT log processor	Log processor for MnT service	You must ensure that this process is running to support MnT operational data.
Certificate Authority service	Cisco ISE Internal Certificate Authority (CA) service	You must ensure that this process is running if Cisco ISE internal Certificate Authority (CA) is enabled.