[eluser]WanWizard[/eluser]
For Datamapper, there is no difference to which MySQL engine you use. Even not which database you use, as it's using CI's database and AR libraries to interact with the database.
Datamapper creates a result object for each result in the resultset. If you load 8K results, it means you have 8K objects in memory. Depending on your PHP or script settings, and everything else you do, this can cause an out-of-memory situation.
As already mentioned, If you have a resultset this big, consider reviewing your logic, this is an indication of a design problem...
