Does RMAN trigger checkpoint before a full backup?

Question

Hello,
My test as follows:
1 insert some data to a table
2 backup full database using rman
3 shutdown abort
4 delete all datafiles(including redo logs)
5 restore and recover database
6 the inserted data can still be found.
I think RMAN triggers checkpoint before a full backup,but I can't verify it,can someone help me?
SQL> select * from v$version;
BANNER
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - Prod
PL/SQL Release 10.2.0.4.0 - Production
CORE     10.2.0.4.0     Production
TNS for 32-bit Windows: Version 10.2.0.4.0 - Production
NLSRTL Version 10.2.0.4.0 - Production
Thanks.

Answer 1

Dear user!
As Mr. Baker already stated in his very friendly way RMAN fires a checkpoint before a backup. You may verify it like that:
1.) Use v$datafile_header to get the checkpoint_time of an arbitrary datafile. In my example I've used datafile number 8.
SELECT file#, name, TO_CHAR(checkpoint_time, 'dd.mm.yyyy HH24:MI:SS') as checkpoint_time
from   v$datafile
where  file# = 8;
     FILE#
NAME
TO_CHAR(CHECKPOINT_
         8
/u01/app/oracle/oradata/ORCL/myts1000_01.dbf
17.06.2009 06:58:312.) Export your NLS_DATE_FORMAT environment variable like that:
set NLS_DATE_FORMAT='DD.MM.YYYY HH24:MI:SS'3.) Start RMAN and backup datafile number 8
BACKUP DATAFILE 8;
Starten backup um 17.06.2009 06:58:29
Kontrolldatei der Zieldatenbank wird anstelle des Recovery-Katalogs verwendet
Zugewiesener Kanal: ORA_DISK_1RMAN will show the time when it started the backup.
4.) Query again v$datafile_header like you did in step 1.
SELECT file#, name, TO_CHAR(checkpoint_time, 'dd.mm.yyyy HH24:MI:SS') as checkpoint_time
from   v$datafile
where  file# = 8;
     FILE#
NAME
TO_CHAR(CHECKPOINT_
         8
/u01/app/oracle/oradata/ORCL/myts1000_01.dbf
17.06.2009 06:58:31As you can see the last checkpoint_time of datafile 8 is near to the startingtime of the backup.
I hope that's what you wanna know.
Yours sincerely
Florian W.