RE: RMAN - Some basic Qs.

From: Goulet, Dick <DGoulet_at_vicr.com>
Date: Tue, 01 Apr 2003 08:24:12 -0800
Message-ID: <F001.00577218.20030401082412@fatcity.com>

1. RMAN does not generate excessive redo because it does not use the 'alter tablespace ... begin backup' command. It instead coordinates with dbwr, somehow, to be sure it is getting a consistent view of the tablespace.
2. The concept of an incremental backup is that you only backup the database blocks that have changed since the last incremental of the same or higher level. Somehow the date that the block changed is being managed, probably in the header somewhere.
3. If your reading a block for backup purposes, it's pretty easy to checksum it and compare with what's in the header just like the Oracle kernel does.
4. I've tried before with OmniBack and it's fairly simple. You only have to relink Oracle including a MML library file. The package you want to integrate with should have instructions.

Dick Goulet

-----Original Message-----
Sent: Tuesday, April 01, 2003 10:19 AM
To: Multiple recipients of list ORACLE-L

Qs.1 Why is NO excessive Redo Generated wsing RMAN Backups unlike HOT Backups when taking backup of an OPEN Database which is undergoing User Transactions ? (Or am i mistaken ?)

Qs.2 How does RMAN manage Incremental Database Backups ? What is the Concept behing it ?

Qs.3 How does RMAN Check for Block Corruption while taking backup ?

Qs.4 Is it easy to integrate 3rd part tools like Legato etc with RMAN for enabling taking of backups onto backup devices OR does it need an extensive setup ?

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Author: VIVEK_SHARMA
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Author: Goulet, Dick
  INET: DGoulet_at_vicr.com

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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 Tue Apr 01 2003 - 10:24:12 CST