what is a resource limit
The assignment of a cost to a resource can be performed with the ALTER RESOURCE COST command. Resource limits that you set explicitly for a user take precedence over the resource costs in an assigned profile. Use of resource limits is set in the database initialization parameter RESOURCE_LIMIT=TRUE. By default, this parameter is set to FALSE. This parameter can be changed interactively with an ALTER SYSTEM command. The DBA_PROFILES view provides information on all the profiles and the resource limits for each profile.