The database structures are generated by the modules. The storage engine generally default but is specified for a few tables based on the ACID requirement of the table.

^  table  ^  Preferred Engine  ^
|_messages|myISAM|
|_mail|myISAM|
|_egrades|InnoDB|
|_cgrades|InnoDB|
|_delinquency|InnoDB|


===MyISAM	OR InnoDB===
|Required full text Search	 |myISAM|	
|Require Transactions	     |innoDB|
|frequent select queries	 |myISAM|	
|frequent insert,update,delete|innoDB|
|Row Locking (multi processing on single table)	 |innoDB|
|Relational base design	     |innoDB|


[[http://developer99.blogspot.com/2011/07/mysql-innodb-vs-myisam.html]]