[Django]-In Django, getting a "Error: Unable to serialize database" when trying to dump data?

Could be something similar to this.

Run it with:

python manage.py dumpdata --indent=2 -v 2 --traceback gigs 

To see the underlying error.

I once ran in a similar problem where the error message was as mesmerizing as yours. The cause was a lack of memory on my server. It seems that generating dumps in json is quite memory expensive. I had only 60meg of memory (at djangohosting.ch) and it was not enough to get a dump for a mysql DB for which the mysql dump was only 1meg.

I was able to find out by watching the python process hit the 60meg limit using the top command in a second command line while running manage.py dumpdata in a first one.

My solution : get the mysql dump and then load it on my desktop pc, before generating the json dump. That said, for backup purposes, the mysql dumps are enough.

The command to get a mysql dump is the following :

mysqldump -p [password] -u [username] [database_name] > [dump_file_name].sql

That said, your problem could be completely different. You should really look at every table that has a foreign key to your Location table, and check if there is no field pointing to a previously deleted location. Unfortunately MySQL is very bad at maintaining Referential integrity, and you cannot count on it.

This error shows because there’s a mismatch between your DB’s schema and your Models.

You can try find it manually or you could just go ahead and install django-extensions

pip install django-extensions

and use the sqldiff command which will print you exactly wheres the problem.

python manage.py sqldiff -a -t

First and foremost, make your models match what your db has. Then run migrations and a fake migrate:

python manage.py makemigrations && python manage.py migrate --fake

That alone should let you run a dump. As soon as django makes sure the DB’s schema matches your models, it will let you.

Moving forward, you can update your models and re-run the migrations as usual:

python manage.py makemigrations && python manage.py migrate

you can –exclude that particular app which is creating problem , still there will be database tables , it worked for me

python manage.py dumpdata > backedup_data.json --exclude app_name