We've been building database-oriented web applications for internal business operations functions for 15 years using MySQL/MariaDB (not Oracle). These databases have been customized to our clients' specific business requirements, and have been used in a variety of custom business applications outside the mainstream application areas of payroll and accounting. Our experience is building straightforward databases for modest-scale applications. If you need someone to optimization performance of distributed databases, or configure server replication systems, we are not your choice.