RDS cloud database
1, is automatically copied from the master, to ensure high availability of the database, failover without manual intervention
2, a plurality of read-only copy of instances may be added to enhance the scale and performance of the database
3, the backup data is automatically synchronized to the cloud storage jingdong , offers 3-copy storage
4, support elastic expansion to meet business needs
RDS is available to support multi-zone deployment
1, a single deployment of the available area
2, a multi-zone deployment is available (recommended)
The master node from the node to the database, all data modifications to the master node changes to the trace log to change from node to modify the content to ensure that there are multiple copies of the log heavy exchange of methods, such as the collapse of the master node node can take over from the primary node work , to maintain data consistency, the two databases deployed to prevent single points of failure are available in different areas of AZ.
