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4.3. Virtual Database Connection Type
Once your VDB is deployed, you can configure a property in it called connection type. By setting this property, you can determine what type of connections can be made to the VDB. You can set it to one of the following:
- NONE: disallow new connections.
- BY_VERSION: (the default setting) allow connections only if the version is specified or if this is the earliest BY_VERSION VDB and there are no VDBs marked as ANY.
- ANY: allow connections with or without a version specified.
If you only want to migrate a few of your applications to the new version of the VDB, then set it to BY_VERSION. This ensures that only applications that know of the new version may use it.
If only a select few applications are to remain on the current VDB version, then you will need to update their connection settings to reference the current VDB by its version. The newly deployed VDB will then have its connection type set to ANY, which allows all new connections to be made against the newer version.
If you need to undertake a rollback in this scenario, then the newly-deployed VDB will, accordingly, have its connection type set to NONE or BY_VERSION.
