The Impact of Object-Relational Mapping Frameworks on Relational Query Performance

This paper considers the impact of object-relational mapping (ORM) tools on relational database query performance. ORM tools are widely used to address the object-relational impedance mismatch problem but can have negative performance consequences. We first define the background of the problem, detailing the growth of ORM tools against a backdrop of a changing application development landscape, then demonstrate examples of undesirable query performance patterns resulting from the application of these tools using a leading application stack. We review selected literature for prior research into this problem and summarise the findings. Finally, we conclude by suggesting future research directions to help mitigate the issue