I would like to know about database certification. I know there are plenty database certifications offered by different database developers. I would like to know the best suited rather widely accepted certification amongst these. Currently, I am working with Java-Mysql(I am not expert in it. Generally I use google to resolve the issues.) combination. I googled about oracle's database certification like OCA and OCP. I would like to know prerequisites and time required to finish the certification. I am aware of the fact that time factor depends on individual but I am going to learn by myself. Therefore I would welcome any online lessons or tutorials website in order to study these certification. Thank you in advance.