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You can enable logical replication by setting the parameter rds.logical_replication
parameter in Cluster Parameter group. There will not be any impact on the existing Aurora replicas/reader instances in the cluster. Additionally, you do not need to add new instances in the cluster just because the logical replication is enabled.
Thank you for reaching out. Since you mentioned CDC, I will also recommend you to review this document since it provides guidance on the enabling Logical replication for CDC. [Using a PostgreSQL database as an AWS DMS source - Enabling change data capture (CDC) using logical replication - https://docs.aws.amazon.com/dms/latest/userguide/CHAP_Source.PostgreSQL.html#CHAP_Source.PostgreSQL.Security
Thanks @arnab, the intention is to run CDC indefinitely (i.e we are not just migrating DB), does DMS still solve the problem cleanly and cost effectively?
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Thanks for confirming!