django.db.utils.OperationalError: (1071, 'Specified key was too long; max key length is 767 bytes')

Question

My model:

class Course(models.Model):
    language = models.ForeignKey(Language)
    name = models.CharField(max_length=50, unique=True, default=\'course\')
         


        

Answer 1

I ended up adding

'OPTIONS': { 'init_command': 'SET storage_engine=INNODB;' }

to my DB backed configuration in settings.py and that fixed the problem.

The MySQL server was configured to use InnoDB as a default engine, but due to some reason it still tried to create tables with the MyISAM. I am running MySQL 5.1 with Django 2.2.1 and Python 3.6.7

Answer 2

The previous two answers did not help in my case, so I'm posting my solution to my case when your limit is 1000 (i.e. 1071, 'Specified key was too long; max key length is 1000 bytes').

First of all, make sure you are working on utf8 encoding!

Then, navigate to your setting file my.ini, find the line default-storage-engine=xxx. If it is

default-storage-engine=MYISAM

please change to

default-storage-engine=InnoDB

Then, the problem should be solved.

The reason is simply because MYISAM does not support key size greater than 1000 bytes.

Answer 3

You can recreate "database" again:

CREATE DATABASE mydatabase CHARACTER SET utf8 DEFAULT COLLATE utf8_general_ci;

or change config file. Open /etc/mysql/mariadb.conf.d/50-server.cnf and change:

character-set-server  = utf8
collation-server      = utf8_general_ci

Answer 4

Just upgrade and migrate database to MySQL-8.0.11 or ** MySQL-5.7.21** also make sure to use utf8 and utf8_general_ci

I had that problem, then I updated to 8.0.11 on my testing enviroment and 5.7.21 on the server. Now it migrates on both enviroments.

Answer 5

solution is

ALTER DATABASE `databasename` CHARACTER SET utf8; 

Answer 6

Upgrade mysql to 5.7 and try migrate again.

wget https://dev.mysql.com/get/mysql-apt-config_0.8.1-1_all.deb  
sudo dpkg -i mysql-apt-config_0.8.1-1_all.deb  
sudo apt-get update
sudo apt-get install mysql-server