What High-Reliability Mechanisms Does DDM Provide?

Protection of Data Integrity

DDM instance faults do not affect data integrity.

• Service data is stored in shards of RDS MySQL DB instances, but not on DDM.
• Configuration information of schemas and logical tables is stored in DDM databases. Active and standby DDM databases are highly available.

Fault Tolerance

DDM uses the RDS MySQL fault tolerance mechanism. RDS for MySQL ensures that data is written to a database. DDM considers that data is written to the database if the RDS MySQL DB instance returns a message indicating that the SQL statements is executed successfully.