The difficulty of Oracle's certification exams varies with different levels and areas of specialization. Generally, lower level certification exams are relatively easier, while higher level exams require more in-depth knowledge and experience and are more difficult. In addition, the difficulty of certification exams is influenced by a variety of factors such as an individual's skill level, educational background, study time and effort. Overall, Oracle's certification exams are generally considered to be challenging and comprehensive, requiring candidates to be well-prepared and to study the relevant technical areas in depth. If candidates have sufficient knowledge and practical experience, and prepare and sit for the exams carefully, they should be able to successfully pass the Oracle certification exams.