Hi,

The PostgreSQL job is used by other jobs like CloudController, UAA, and other jobs. If you want to use services in the marketplace, You need to do bosh deploy for that particular service. Please follow below links to deploy MySQL services to the marketplace.

https://blog.starkandwayne.com/2014/07/02/adding-mysql-service-to-your-trycf-cloud-foundry/
https://github.com/cloudfoundry/cf-mysql-release

Hope that helps.