Title
Accelerating Recursive Queries in Federated Database Systems: SmallWorld Networks Based Approach,Used
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Federated Database System (FDBS) is a general name for storage systems consisting of distributed data sources. The data sources can be databases or any software system with query interface. Recursive Queries are queries on which the result relation is defined in terms of itself, and involves an infinite, recursively defined sequence of similar expressions. This work addresses the issue by providing a heuristic which tries to improve the execution of the recursive queries on FDBS based on the database structure. In the development process we have used the knowledge aquired in the area of real world networks since most databases on which a recursive query can be executed represent a type of real world network. We used the fact that on some networks there are nodes with a large degree (sometimes called Hubs) in order to reduce the sizes of sub queries. This size reduction is achieved by limiting the search of the reachability set of a node in the graph to the edges coming out of hubs connected to that node, and the hubs they are connected to and so forth.
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We ship your order within 2–3 business days for USA deliveries and 5–8 business days for international shipments. Once your package has been dispatched from our warehouse, you'll receive an email confirmation with a tracking number, allowing you to track the status of your delivery.
Returns
To facilitate a smooth return process, a Return Authorization (RA) Number is required for all returns. Returns without a valid RA number will be declined and may incur additional fees. You can request an RA number within 15 days of the original delivery date. For more details, please refer to our Return & Refund Policy page.
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Warranty
We provide a 2-year limited warranty, from the date of purchase for all our products.
If you believe you have received a defective product, or are experiencing any problems with your product, please contact us.
This warranty strictly does not cover damages that arose from negligence, misuse, wear and tear, or not in accordance with product instructions (dropping the product, etc.).
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Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
We accept payments with :
Visa, MasterCard, American Express, Paypal, Shopify Payments, Shop Pay and more.