Amazon RDS now supports Redo Transport Compression, a feature that compresses redo data before it is transmitted to a standby database. By reducing the amount of data sent over the network, it improves redo transport performance. Because of faster redo log transport, customers can achieve a lower Recovery Point Objective (RPO), which is the amount of data loss that may occur when promoting a replica in situations where the primary instance becomes unavailable.
Compression and decompression of redo data consumes CPU resources on both the primary and standby databases. Customers should ensure that sufficient CPU capacity is available to handle this increased workload, and use Redo Transport Compression in situations where reduced network traffic and improved RPO outweigh the CPU overhead of compression. To enable the feature, set redo_compression parameter in the Parameter Group for your database instance. Redo Log Compression is available for both mounted and read replicas, and requires Oracle Enterprise Edition with Oracle Advanced Compression Licensing.
Redo Transport Compression is available in all AWS Regions where Amazon RDS for Oracle is available. To learn more about using Redo Transport Compression, visit the Amazon RDS User Guide.
Categories: marketing:marchitecture/databases,general:products/amazon-rds
Source: Amazon Web Services
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