You had to unleash that one on us. -----Original Message----- Sent: Thursday, March 14, 2002 12:57 PM To: Multiple recipients of list ORACLE-L
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 -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Post, Ethan INET: [EMAIL PROTECTED] 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: [EMAIL PROTECTED] (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).
