DDM, RDS, DRS enhancements on the Flexible Engine cloud

Flexible Engine
Release Notes

February, 2022

Discover the new updates that have been made to Data Replication Service (DRS), Document Database Service (DDS) and Relational Database Service (RDS).

Distributed Database Middleware (DDM)

Distributed Database Middleware (DDM) is a database middleware service (to be developed into a distributed relational database service) that is compatible with MySQL licenses. It uses a storage-compute decoupled architecture that makes it easy to scale out compute and storage resources to handle a huge number of concurrent requests.  
For more information please check our Online Documentation: https://docs.prod-cloud-ocb.orange-business.com/ddm/index.html 

Relational Database Service (RDS)

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Optimize the following performance parameters for MySQL 8.0:
– innodb_doublewrite_files = innodb_buffer_pool_instances x 2
– innodb_doublewrite_pages =120

Change the default value of internal_tmp_mem_storage_engine to temptable for MySQL 8.0.21 and later versions and to memory for versions earlier than 8.0.21.

Detect the access to primary instance and read replica ports for standby instances.

Support time zone UTC+6:30 and UTC+5:30 for creating a DB instance and modifying the time zone.

Improve the reliability of read replica migration.

Optimize instance creation failure alarms: Add alarm 5012253 Failed to Create a DB Instance Due to Lack of Compute Resources.

Change the default value of the slave_preserve_commit_order parameter to OFF for MySQL 5.6.

Add alias in the API for querying details about DB instances.

Add rds_xa_crash_safe to control whether to enable the function of recovering distributed transactions from a crash.

Support Database/User management on Console

Optimize the default parameter templates for PostgreSQL 10, 11, 12, and Enhanced Edition. 
Include the following sensitive operations for protection: downloading backup files, deleting backups, and restoring backups of PostgreSQL databases. 
Support Chinese characters in DB instance names. 


For more information on Relational Database Service (RDS)Deploy your databases in a stable and secure way (orange-business.com) 

Data Replication Service (DRS)

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DRS supports real-time synchronization from: 

  • MySQL to MySQL 
  • MySQL to Kafka 
  • Oracle to MySQL(CA) 
  • Oracle to PostgreSQL. 


Data Flow Increment Full  Full+Incremental
Real-time synchronization from MySQL to MySQL Supported Not supported  Supported
Real-time synchronization from Oracle to MySQL Not supported Not supported  Supported
Real-time synchronization from Oracle to PostgreSQL Not supported Not supported  Supported
Real-time synchronization from MySQL to Kafka Supported Not supported  Not supported


DRS supports real-time synchronization of: 

  • MySQL 5.6, 5.7, and 8.0. 
  • Oracle 10g, 11g, 12c, 18c and 19c 
  • PostgreSQL 9.5, 9.6, 10, 11 and 12 
For more information on Data Replication Service (DRS)