Oracle-L: RE: Hot Backup using EMC /BCV splits

From: John Weatherman <john.weatherman_at_replacements.com>
Date: Thu, 15 Aug 2002 08:13:43 -0800
Message-ID: <F001.004B6494.20020815081343@fatcity.com>

Nate,

We are doing this as well on Solaris w/ Veritas. Our series is:

Put everything in hot backup mode
Split all volumes EXCEPT archive
Take everything out of hot backup mode
Log switch
Split Archive

We use this for cloning on a nightly basis and haven't had any issues. However, when we didn't wait on splitting off the offline archives I ran into some problems with everything being where it should be for recovery (read I was missing the last redo log). The problem with "EMC does it all" is that the datafiles themselves may be inconsistant at the split, hot backup mode forces consistancy by freezing the scn's (somebody correct me if I'm way off, but that's my understanding).

Try asking this, why are we bothering with Hot Backup mode at all? After all, the datafile "copies" aren't being made during hot backup mode, so it's a non-event from Oracle's perspective (and don't let him get away with just dropping hot altogether!).

HtH,

John P Weatherman
Database Administrator
Replacements Ltd.

-----Original Message-----
Sent: Thursday, August 15, 2002 10:59 AM To: Multiple recipients of list ORACLE-L

Hello,

We are on IBM AIX 4.3.3 with EMC and BCVs. Our Unix admin has setup the backups for the database in following sequence to do the Hot backup.

Put all tablespaces in the database in Hot backup mode
Sleep 5
Put all the tablespaces back into normal mode
Split the BCV's
Mount on another machine and backed up from it.

What I am concerned is with step 4. Split BCV's should be done at step 2 instead of step 4.
According to our Unix Admin, EMC takes care of consistency and there is no need for any concern. As per him the split is instant split and EMC guarantees consistency.

What do you all think. What is the recommended procedure.

TIA, Nate

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Author: Nat
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Author: John Weatherman
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