Effectively managing storage in Amazon RDS for Oracle Databases

This article provides comprehensive best practices for managing storage in Amazon RDS for Oracle databases to maintain performance, reliability, and cost-effectiveness.

• Monitor free storage using CloudWatch FreeStorageSpace metric and set alarms for proactive alerts
• Enable storage autoscaling to automatically increase storage when free space drops below 10%
• Remove unwanted files (RMAN backups, data pump exports, archive logs) using UTL_FILE.FREMOVE
• Check table fragmentation and reorganize using CTAS, ALTER TABLE MOVE, DBMS_REDEFINITION, or SHRINK SPACE
• Use ALTER TABLE SHRINK SPACE for efficient online space reclamation with minimal disruption
• Perform tablespace coalesce operations to combine adjacent free space and reduce fragmentation
• Resize tablespaces manually when allocated space doesn't automatically shrink after data deletion
• Monitor SYSAUX tablespace closely; separate audit trails to dedicated tablespace if auditing enabled
• Test all reorganization procedures in non-production environments before production deployment

Implementing robust monitoring, storage autoscaling, regular file cleanup, and periodic table reorganization ensures optimal RDS Oracle database performance and cost efficiency.