Question About the Database (MySQL)
I used MySQL(version 126.96.36.19915) as the database and Windows Server 2012R2 as OS. However, I find that some content type widgets(Images, Videos and Documents & Files) are disappeared(attachment). And I tried to use the modules builder to build my own content widget(named temp)(with media images), it showed the errors(attachment) when I created the items of my widget. How can I solve this problem?
After further investigation we found that the problem could be caused by a limitation of SQL server. Please review the following article: http://dev.mysql.com/doc/refman/5.6/en/innodb-restrictions.html.
The max key length is configurable in MySQL, please try to increase the max length to resolve the issue.