data Difference between two schemas in Liquibase

Hi All,

I am running the below command
java -jar liquibase.jar
 --clasapth=<classpath + liquibase jar>
 --changeLogFile=<file name + path>

This command gives me a file dump with xKB , the file contains only the changeSet of the (url+username+password) DB, not the actual comaprison between both the tables and values of each table.

can you please help me with the correct command if the above one is wrong ?

team, help/tips to acheive my above stmt will be much appreciable.