Configure comparison feature in Migration Manager
Obtain the JDBC URL, schema name, user ID and password to the target database. Enter these details into the Manage Targets dialog in Migration Manager app.Define a Migration Manager package, does not matter Snapshot, Change or Collection. If defining Snapshot, remember that comparison will not apply any of the SQL criteria you define for particular objects.
Leave package in WAPPR status, go to Comparison tab and click New Job. Choose the target database entry you just created in Manage Targets. The compare will run in the background, you have to click Refresh to determine it has finished.