Priority scheme is not enabled on JIRA instance. So, we are enabling it by adding property "jira.priorities.per.project.enabled" at <yourbaseURL>/secure/SiteDarkFeatures!default.jspa
Please correct if any other table apart from mentioned will be impacted due to above changes:
1. fieldconfigurationscheme
2. configurationcontext
3. optionconfiguration
Database currently being used is oracle database and version of JIRA is 7.11.2( End of life)