I'm interested in comparing the resilience and performance features between MariaDB and PostgreSQL for enterprise-level applications. Specifically, I'd like to understand their handling of large-scale data transactions, failover mechanisms, and real-time data processing capabilities. Can anyone share insights or expereinces on how both databases perform under heavy loads and what might make one a better choice over the other in terms of scalability and reliability? Also, any recommended configurations or practices to optimize performance would be greatly appreciated.