During my entire work, various of database system were under my responsible such as Oracle, MySQL, Timesten, and Kafka. Especially on Oracle is the most experience systems including special option (RAC/GoldenGate/DataGuard) which I can be able to maintenance in order to find out is anything wrong between application and database system. I also have experience on oracle performance tuning during developed and on production phase.
Database always the hardest part of my job because most of them are enterprise productions. All of them also have million of subscribers data which are online generating million of revenue to the company. So every action that we have done always have a consequence to our customers.
In sum, I always careful in my job every step especially in database task to make sure that I will not miss anything wrong on them.