https://community.alfresco.com/thread/203012-activiti-explorer

engine.properties

# demo data properties
create.demo.users=false
create.demo.definitions=false
create.demo.models=false
create.demo.reports=false

db.properties

#db=h2
#jdbc.driver=org.h2.Driver
#jdbc.url=jdbc:h2:mem:activiti;DB_CLOSE_DELAY=1000
#jdbc.username=sa
#jdbc.password=

db=mysql
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/clean
#jdbc.url=jdbc:mysql://YCY-rgq:3306/libra?autoReconnect=true
jdbc.username=root
jdbc.password=root