This illustration shows a Oracle9i server with Oracle Text and Oracle Ultra Search. It illustrates the following steps in queuing URLs:
- Oracle spawns a crawler according to schedule.
- The crawler initiates multiple crawling threads.
- The crawler thread removes the next URL in the queue.
- A crawler thread fetches the URL page from the Web.
- A crawler thread extracts the hypertext links from the URL page and inserts new links into the URL queue.