Change your releases so that the developer and DBA relationship can be improved with non-functional releases. The business users that quite often drive the I.T. department need educating on the technical aspects of running systems. Having technical releases allow for database patches to be formalised and code optimisations to be written. Over time these formal technical releases educate the parties as to each others role. They need to be formal, described and discussed so the business user, developer and DBA are educated by them.