The main aim of installing Oracle Linux was to test it after years of using CentOS, and to test Oracle APEX. After one year of testing, I encountered problems that I was not able to solve:
I was not able to do rotated backups; upgrading to a newer version of APEX was a nightmare; I could not enter GlassFish admin console; and I could not install SQL Developer. Then I thought that if I bought the cheapest version of Oracle Database I would get the support neccesary to get this know how. Two sales persons contacted me. But they were not interested in solving my doubts. Their only interest was selling me the cloud database, for the fantastic price of (more or less) 1000 euros per year. I explained to them that my alternative was a second hand PC, plus CentOS, plus Postgres, plus Eclipse. They did not offer me a cheap version of Oracle database. I understoo the message, Oracle, both Linux and database, were not for me.
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I decided to purchase Oracle Database. I thought that if I bought the product, I would get support. I asked some easy questions to the sales agent who contacted me. He was more interested in selling me the cloud database than answering my questions. I learned that I am too small for Oracle. I continued with CentOS and Postgres. Google provides me with all the information I need. I could not get all the information I needed from Oracle.