General introduction
The Basic Edition is a new series of ApsaraDB for RDS, which is deployed based on a single-node architecture. Compared with the mainstream master/slave High-availability Edition, the Basic Edition contains only one node and has no slave node for fault recovery. Currently, both MySQL and SQL Server support this new series.
The following picture shows the architecture of the Basic Edition and High-availability Edition.
Comparative advantages
The slave database in the High-availability Edition is used only for failover but does not provide services, and the database replication causes extra performance cost to the master database. In this respect, the Basic Edition is not inferior but superior to the High-availability Edition in terms of performance.
The Basic Edition uses the underlying data distributed storage layer to guarantee the stability of multiple replicas, that is, the fault in or damage to one physical node does not result in data loss. Besides, the costs can be greatly saved by reducing one database node. As a result, the price of the Basic Edition is only half of the High-availability Edition.
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Note |
| Because there is only one database node, when the node fails, it takes longer to recover the node. Therefore, the High-availability Edition is recommended for sensitive businesses that have higher requirements on database availability. |
Restrictions
Compared with the High-availability Edition, the Basic Edition does not support the following functions:
- Master/slave failover
- Zone failover
- Safe connection mode
- Log management
- Performance diagnosis
- Read-only instances
- Disaster recovery instances