public void setDBSystemId(String dBSystemId) {
        this.dBSystemId = dBSystemId;
    }
<p>
The Oracle system ID (Oracle SID) for a container database (CDB). The Oracle SID is also the name of the CDB.
This setting is only valid for RDS Custom DB instances.
</p>

@param dBSystemId
       The Oracle system ID (Oracle SID) for a container database (CDB). The Oracle SID is also the name of the
       CDB. This setting is only valid for RDS Custom DB instances.
aws-java-sdk-rds/src/main/java/com/amazonaws/services/rds/model/DBInstance.java