Gotta be this one. I wouldn't love it so much except for the part
about the USS Nimitz.
> When you place a tablespace in backup mode, the Oracle instance
> notes that a backup is being performed and internally compensates
> for it. As you know, it is impossible to make an authentic copy of a
> database file that is being written to. On receipt of the command to
> begin the backup, however, Oracle ceases to make direct changes to
> the database file. It uses a complex combination of rollback
> segments, buffers, redo logs, and archive logs to store the data
> until the end backup command is received and the database files are
> brought back in sync.
>
> Simplifying a hot backup in this way is tantamount to classifying
> the USS Nimitz as a boat. The complexity of the actions taken by the
> Oracle RDBMS under a hot backup could consume an entire chapter and
> is beyond the scope of this book. What you should understand is the
> trade-off for taking a hot backup is increased use of rollback
> segments, redo logs, archive logs, and internal buffer areas within
> the SGA.
--
Jeremiah Wilton
http://www.speakeasy.net/~jwilton
On Thu, 14 Mar 2002, Freeman, Robert wrote:
> Ok... one of my favorite Urban Legends is this one:
>
> The book is always right. In other words, if it's written down
> in a book we bought off of Amazon, it must be so.
>
> So, I'd like to ask, without anyone taking potshots at
> specific authors, what is the dumbest, silliest, or most
> technically incorrect thing you have ever seen in an
> Oracle book?
--
Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author: Jeremiah Wilton
INET: jwilton_at_speakeasy.net
Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
San Diego, California -- Public Internet access / Mailing Lists
--------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
the message BODY, include a line containing: UNSUB ORACLE-L
(or the name of mailing list you want to be removed from). You may
also send the HELP command for other information (like subscribing).
Received on Thu Mar 14 2002 - 12:56:31 CST
