Re: EMC BCV Splits and Hot Backup mode.

If you lose one side of a mirrored pair, the instance doesn't notice - it just continues to process against the survivor(s).

On the other hand, if you need to restore a backup (BCV, split mirror or otherwise), you need to be able to roll it forward to a consistent state. Consider a BCV split as just a fast hot backup. That is, in fact, exactly what it is.

-Don Granaman
[OraSaurus - Honk if you remember UFI!]

• Original Message ----- To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com> Sent: Monday, September 24, 2001 12:40 PM

> It is my understanding that the common implementation of copying an Oracle
database on an EMC using BCVs is this;
>
> 1) put the source database in BEGIN BACKUP mode for all the tablespaces,
> 2) break the mirror,
> 3) put tablespaces in END BACKUP mode
> 4) recover on target, or backup the files.
>
> Question:
> Why is it necessary to put the database in 'hot backup' mode when splitting a
BCV? If it is just like splitting a mirror, why do you need the database in hot backup mode at all? Wouldn't it be the same as losing one side of a mirrored pair? When that happens, no extra processing is needed.

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Author: Don Granaman
  INET: granaman_at_home.com

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