[Fixed]-I don't know my Database name

Python comes with sqlite3 included, but if you only want to dump the data then:

django-admin dumpdata

or

python manage.py dumpdata

will do it for you. For more details read: https://docs.djangoproject.com/en/1.9/ref/django-admin/#dumpdata where it says:

–output OUTPUT, -o OUTPUT

New in Django 1.8.

Specifies a file to write the serialized data to. By default, the data
goes to standard output.

which means that if you’re using a Django version >= 1.8 you could use:

python manage.py dumpdata --output my-database-dump.json

and if you’re on an earlier version of Django you would need to use:

python manage.py dumpdata > my-database-dump.json