On the Exalytics Machine, you perform deinstallation both for Oracle TimesTen and Oracle Business Intelligence, as described in the following list:
Deinstallation for Oracle TimesTen is described in "Uninstalling TimesTen on UNIX systems" in Oracle TimesTen In-Memory Database Installation Guide.
Deinstallation for Oracle Business Intelligence is described in "Deinstalling Oracle Business Intelligence" in Installing and Configuring Oracle Business Intelligence.