The network domains of Database Autonomy Service (DAS) are used when you use DBGateways in the DAS console to access third-party networks.
- If a DBGateway in the centralized mode is deployed, you must select a network domain to identify the source system of the instance connected to the DBGateway.
- If certain DBGateways in the centralized mode reside in the same network domain, the DBGateways provide load balancing and disaster recovery features.
- If you use the same network domain for two separated networks, the DBGateway in a network accesses the database instances that reside in the other network. This results in the failures of connecting instances.
In most cases, if the databases that run on your on-premises data centers use a DBGateway to connect to DAS over the Internet, DAS automatically generates a
default network domain.
If you use a DBGateway in the centralized mode, create a network domain based on your business needs in the following scenarios:
- A newly connected on-premises database cannot communicate with an existing database that is connected to DAS.
- You want to divide regions based on your business needs. For example, you need to divide regions based on cities.