Conceptual, logical, and physical database models can be regarded as PIM, PSM1, and PSM2 data models within MDA architecture, respectively. Many different logical database models can be derived from a given conceptual database model by applying a set of transformations rules. To choose a logical database model for further transformation (to physical database model at PSM2 level) some selection criteria based on quality demands, e.g. database efficiency, easy maintainability or portability, should be established. To evaluate quality of the database models some metrics should be provided. We present metrics for measuring two selected, conflicted quality characteristics (efficiency and maintainability), next we analyse correlation between the metrics, and finally propose how to assess quality of logical database models.