title: Magento URL indexing and core_url_rewrite table
body: <p>Can anybody shed some light on how Magento determine whether to create a new URL rewrite for a product? Every time I run the Catalog URL Rewrite reindex process the number of rows in core_url_rewrite increases by roughly 10,000 rows. Since no product data has been modified in the mean time, why is a new URL generated?</p>