Phased RMAN up-to-date image copies - order of the steps in the script

Hello

I have a question about copies of images RMAN gradually updated. In the documentation (http://download.oracle.com/docs/cd/B28359_01/backup.111/b28270/rcmbckba.htm#BRADV8186) it says that the script should look like this:
RUN
{
  RECOVER COPY OF DATABASE 
    WITH TAG 'incr_update';
  BACKUP 
    INCREMENTAL LEVEL 1
    FOR RECOVER OF COPY WITH TAG 'incr_update'
    DATABASE;
}
If this script is run every day, the copy of the image is at least one day "behind" compared to the State of the database, where data recovery is necessary, therefore apply the last incremental backup of 1 and archivelogs of today (more online redo logs) to recover completely.

However, if the measures are reversed like this:
RUN
{
  BACKUP 
    INCREMENTAL LEVEL 1
    FOR RECOVER OF COPY WITH TAG 'incr_update'
    DATABASE;
  RECOVER COPY OF DATABASE 
    WITH TAG 'incr_update';
}   
so first of all the incremental backup is done and then it is immediately applied to the image of the copies. So if the recovery of the database is necessary, it is necessary to apply a single day with a value of recovery logs archived at most (in addition to the newspapers online when possible of course).

Does anyone know if there is any drawback in using the second script above? One that comes to mind is that the recovery window is reduced by one day, but as I understand it the main purpose of copies of the image gradually update is to provide as soon as possible recover in time, then the window of recovery should not play a role here.

Thanks in advance for your comments.

Kind regards
Swear

With your strategy the backup comes close to being a database from the previous day. So, if the "BACKUP INCREMENTIELLE" works at 01:00 and the COPY 'RECOVER' at 2:30 for half an hour, backup to disk is now has to 01:00 today, instead of being from 02:00 yesterday.

He does, then, to recover to a point in the last 24 hours, if we find the logical corruption--the same problem that with Eve also spread the logical corruption. (Of course, in your case, this 'sleep' did a catch-up with primary only once a day, instead of a catch-up streaming).

If you scroll further down, the advanced example allows a window of 7 days recovery.
Thus, using the first method allows a window of recovery of 24 hours (more or less some difference for the operating times). And they rely on it to extend the window of recovery at 7 days.

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