External online data access in Oracle

Hi All,
Can anyone please tell me whether we can query the data online from Oracle applications without loading the data into registered tables.
Going in detail,
I want to create few dashboard profiles of billpayment details, where details are coming from external Billing module. Hence updating the details on the tables in CRM database on batches would be a very huge load on the system. So is there any provision that i can make a query which accesses the billing module (database) directly online at the instant when i query on the dashboard??
Kindly let me know the feasibility asap.

What type of database is that external Billing module on? Oracle?

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