Difference between fetch and cache
Anyone know the difference between recovery and caching when ITS analyses a source? In the document below under Maintenance crawls, it says in step 4 that the robot will pick up the item. This means - it downloads in the memory of the Server HIS?He also says, in step 5, it compares the checksum of the file that is located in the cache. Is this the same cache is place of conservation for indexed content needs? Any help on this would be greatly appreciated!
Thank you
dhartle
Here's the source document: http://download.oracle.com/docs/cd/E10502_01/doc/search.1018/e10418/crawler.htm#i1004689
Analysis of maintenance
After the initial analysis, a page of the URL is only ramp and indexed if it has changed since the last scan. The robot determines if it has changed with the HTTP If-Modified-Since header field or the checksum for the page. URL that no longer exist are marked and removed from the index.
To update the modified documents, the robot uses an internal checksum to compare the new Web pages with caching of Web pages. Change of Web pages are cached and marked for re-indexing.
The steps involved in the synchronization of the data are:
1 oracle creates the robot according to the schedule that you specify with the administration tool. The queue of the URL is filled with the URLS of seeds of the source assigned to the schedule.
2. the robot launches several crawling threads.
3. each chenille wire removes the following URL in the queue.
4. Each robot thread retrieves the document from the Web. The page is usually an HTML file containing text and hyperlinks. When the document is not in HTML format, the robot tries to convert the document to HTML before caching.
5. each chenille wire calculates a checksum for the newly recovered page and compared to the checksum of the cached page. If the checksum is the same, then the page is ignored, and the robot goes to step 3. In the contrary case, the robot will move to the next step.
6. each chenille wire Scans the document hyperlinks and inserts new links in the queue of the URL. The links that are already in the document table are ignored. (Oracle ITS doesn't follow links binary documents filtered.)
7. the robot marks the URL as "accepted". The URL is parsed in the future, maintenance tests.
8. the robot saves the URL in the document table.
9. If the file system cache is full or the URL queue is empty, the cached Web page stops and commences. Otherwise, the thread of Caterpillar again step 3.
"This means it downloads in the memory of the Server HIS?"-Yes.
"He also said to step 5 that it compares the checksum of the file that is located in the cache. Is this the same cache which is the place of conservation for content that is indexed? "- Yes, but I'm sure that the checksum (as calculated to the last time) is stored in a table, so that it is not actually access the cached file.
Tags: Oracle
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