症状

Errors when creating table schema during database migration or an upgrade

原因

The default storage engine for MySQL is MyISAM. It does not support referential integrity, foreign key constraints or transactions, so it may cause data corruption. See - http://dev.mysql.com/doc/refman/5.1/en/storage-engines.html

ソリューション

• Set the storage engine by passing the '--default-storage-engine=INNODB' option when starting the session.
  Or
• Alter the existing table storage engine to use INNODB type

  
  ALTER TABLE <tablename> ENGINE=INNODB;
  

  または
• Make the default MySQL Server setting by adding this option to the my.ini (or my.cnf) configuration file.