Data replication between transactional (OLTP) and analytical (OLAP) databases is a critical yet imperfect process essential for accurate reporting and analytics in organizations. Challenges arise when data replication errors occur due to unexpected schema changes, broken ETL pipelines, or imperfect data replication tools, leading to inaccurate or missing data and disrupted workflows. To mitigate these issues, data teams can employ various testing strategies, ranging from basic source-level tests to more advanced automated cross-database comparisons using tools like Datafold. These strategies help identify and resolve data discrepancies more efficiently, ensuring the OLAP database remains a reliable source of truth. Accurate data replication not only supports technical goals but also fosters trust and drives business success.