SLT replication trigger-based approach is very common with SAP BW system for real-time data replication on any database as per Product Availability Matrix (PAM).
In the above figure, you can see the simple architecture of SLT data replication with SAP BW system. SLT data replication is suggested for simple tables without any join or transformation. SLT replication server can be used by SAP BW customers and it is independent of underneath database.
SLT Replication server is used to administrate and manage data provisioning.