I just passed my phd viva with only minor correction. I was not confident before the exam and I was expecting major because when I reread my thesis, I spotted many typo errors and my data analysis was not perfect. I was expecting the examiners to give me major correction to reanalyze the data. However they were happy with my data analysis. One of the examiners did not even bother to show up during viva but he praised my thesis as hight quality thesis :) It was a sweet moment for me because my viva was delayed multiple times and I had to wait for 7 months for viva. For those of you who are waiting for viva, please remain calm and always reread your thesis multiple times before you go for viva