How to define the index length for a domain attribute in Grails 5 with MySQL? [duplicate] MySQL with InnoDB has a max index length it allows. If a String field in a Grails domain class has a maxSize: 2048 constraint, then an index on that field won't be created in MySQL, even if it's defined in the mapping DSL: static constraints = { archetypePath(maxSize: 2048) } static mapping = { tablePerHierarchy false archetypeId index: 'aid,aidpath' archetypePath index: 'aidpath' } When I check my table, there is no index including the archetypePath...