On 7/26/07, Paul Newton <[EMAIL PROTECTED]> wrote: > How can the server resolve if it should be answering the request from > cache or disk unless the requests contain some info which enables the > server to distinguish those requests which can be serviced from cache > from those which must be serviced from disk ?
The request the server receives says something like "read block 823 offset from the beginning of file customer.dbf and return the results to me." The server ought to know whether the current value of that block is in a dirty buffer due to be written to disk, whether it is in a clean read buffer ready to be returned to the client without disk activity, or whether it needs to be read from the disk. That is the purpose of a file server. -- Ted Roche Ted Roche & Associates, LLC http://www.tedroche.com _______________________________________________ Post Messages to: [email protected] Subscription Maintenance: http://leafe.com/mailman/listinfo/profox OT-free version of this list: http://leafe.com/mailman/listinfo/profoxtech Searchable Archive: http://leafe.com/archives/search/profox This message: http://leafe.com/archives/byMID/profox/[EMAIL PROTECTED] ** All postings, unless explicitly stated otherwise, are the opinions of the author, and do not constitute legal or medical advice. This statement is added to the messages for those lawyers who are too stupid to see the obvious.
