Can change the default number of backup pieces in each backupset?

I know that, by default, a backup set contains a single item from backup.
So, I wonder how can I change this default number is greater than 1?

I ask, because, as below, you can see that for a time backup, RMAN has created two backupset.
And I want that it creates a rather backupset:
RMAN> list backup summary;


List of Backups
===============
Key     TY LV S Device Type Completion Time #Pieces #Copies Compressed Tag
------- -- -- - ----------- --------------- ------- ------- ---------- ---
3       B  F  A DISK        06-NOV-10       1       1       YES        TAG20101106T182618
4       B  F  A DISK        06-NOV-10       1       1       YES        TAG20101106T182618
Any help would be appreciated.
Thank you

PhoenixBai,

For some reason, I couldn't read the full command. Now, I can see all.

I'll share a few comments of your example.

(* 1) control file backup *.

RMAN automatically creates backup files of control under certain conditions.

a. when the CONTROLFILE AUTOBACKUP is enabled

b. when including CURRENT CONTROLFILE clause is used as part of the BACKUP command

c. when the system datafile (datafile 1) is part of the input for you files BACKUP.

With AUTOMATIC backup, RMAN creates a set for separate backup control file backup.

Without AUTOBACKUP, RMAN backup of control file as well (but it could be in the same backup set or not according to the sizes of block)

http://download.Oracle.com/docs/CD/E11882_01/backup.112/e10643/rcmsynta007.htm#RCMRF107

d. what archive backup is enabled in 11g with option KEEP.

# I think your case is without feature autobackup 'c '.

-------------------------------------------------------------------------------------

(2) why RMAN create 2 backup sets for the data file and backup control files?

This is because the block of the control file and data file sizes are different.

For each data file.

You can query for each data file dba_tablespaces.block_size.

For the control file,.

In 10g, there isn't an easy way to get it. you would have to use internal views or caculate it.

11 g, can be obtained in v$ controlfile.block_size.

http://download.Oracle.com/docs/CD/E11882_01/server.112/e17110/dynviews_1086.htm#REFRN30043

As you may know, the control file block size is 16 k and hardcorded internally.

----------------------------------------------------------------------------------------------

Comment:

(1) I see that you create a backup that contains the data file 1 (System datafile). That is why RMAN creates backup files of control as well even without control file autobackup.

(2) your output, the data file block size is 8 k, but control file block size is hardcoded as 16 K. It is not possible to keep the two different blocks in a single backup set.

That's why RMAN separated your backup in two backup sets.

Kind regards
Sean

Tags: Database

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