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Target customers: general users. Features released: ApsaraDB RDS for PostgreSQL V11 and V12 High-availability Edition with standard SSDs or enhanced SSDs support the failover slot feature to ensure that logical subscription is not affected when primary/secondary HA switching occurs. If you use the PostgreSQL community edition or ApsaraDB RDS for PostgreSQL versions that do not support this feature, the slot information of logical subscription will be lost after primary/secondary switching occurs. ApsaraDB RDS for PostgreSQL V11 and V12 High-availability Edition with standard SSDs or enhanced SSDs allow you to logically subscribe to PostgreSQL incremental data.