Optimize replication lag for Amazon RDS for Oracle replicas using redo compression – Part 1

This article demonstrates how to optimize replication lag for Amazon RDS for Oracle replicas using the redo compression feature, particularly for cross-Region deployments.

• Redo compression reduces data transmitted over constrained networks by compressing redo before transmission and decompressing at standby instances
• Enable rds.replica.redo_compression parameter using ZLIB or LZO compression algorithms on replica instances
• Requires Advanced Compression license on top of Oracle Database Enterprise Edition
• Testing showed replica lag reduced from 338 seconds to maximum 20 seconds with compression enabled
• Compression trades reduced network throughput for slightly higher CPU utilization on primary and replica instances
• Recommended to test performance impact and compression algorithm effectiveness on non-production instances before production deployment

RDS for Oracle redo compression enables organizations to meet low RPO requirements and reduce data divergence in disaster recovery scenarios by optimizing replica lag in cross-Region configurations.