We are using Amazon Aurora as a database for our web application. we set the transaction level to READ-COMMITTED for our primary instance by creating new parameter group and attaching it to the primary instance to avoid locks. By default amazon replicas are using transaction level as REPEATABLE-READ by using default instance parameter group. When replica is promoted as primary instance in case of failures, our primary instance's transaction level is changing to(TRANSACTION ISOLATION=REPEATABLE-READ ). we wanted to set the transaction level to READ-COMMITTED instead of REPEATABLE-READ when replica(reader) is promoted as primary instance(writer). it would be great if anyone provide a way to achieve this.
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This capability was added in 2019. It requires setting the session-level configuration parameter aurora_read_replica_read_committed. The details are in the docs here:
https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/AuroraMySQL.Reference.IsolationLevels.html#AuroraMySQL.Reference.IsolationLevels.relaxed