Yes, that's an indication that you're probably using dynamic or ad hoc queries and every single variation of the parameter values is resulting in a different execution plan. That's really, really, bad. You're going to be hurting seriously with regards to memory and plan caching. You need to look at parameterizing the query in order to avoid this issue. That can be done by executing it using sp_executesql or by using prepared statements from your code or by creating a stored procedure.