How to do django syncdb in version 1.4.2?

How to do syncdb in django 1.4.2? i.e. having data in database, how to load the models again when the data schema is updated?

Thanks in advance

Thanks Amyth for the hints.
btw the commands is a bit different, i will post a 10x tested result here.

Using south
1. setup the model

python manage.py schemamigration models --initial

2. dump data if you have to

python manage.py dumpdata -e contenttypes -e auth.Permission --natural > data.json

3. syncdb
   

python manage.py syncdb
python manage.py migrate models

4. load the data back into the db
   

python manage.py loaddata data.json

5. Afterwards, you may use
   

python manage.py schemamigration models --auto
python manage.py migrate models

after every change you made in the models schema

A few notes
1. Unloading the database and reload it is essential, because if not doing so the first migration will tell you already have those models.
2. The -e contenttypes -e auth.Permission --natural parameter in dumpdata is essential otherwise exception will be thrown when doing loaddata.