Yes, I didn't say that clearly. What I meant was that Moodle does not specify any limits to the number of rows in any table (ie MAX_ROWS is not set), and the limits that do exist because of MySQL are extremely large, because Moodle tables are small.
Basically, this is not an issue ... the assignment problem is probably something else like a lack of disk space.
General developer forum
Databases: How do I make the max row size larger?
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