Hot Backup - Recovery Time

Question

I have 2 questions on hot backup concept please:
Let's say I started hot backup at 9 AM and finished at 11 AM.
1) I can recover database to the point of 9 AM and on (recover until time) as long as I have all archive logs generated between 9 and 11 AM, right?
2) I can recover database up to 11:30 as well if I have archive logs between 9 AM and 11:30 Am?
Please correct me if I am wrong.
Thanks,

Answer 1

1) Depends
2) YES
Oh, I have an idea....why don't you test this as well. It will give you good practice and experience.
Regards
Tim
Well, I guess it all depends on how you look at it. Ok in simple terms let us say you have 2 data files A and B. If your backup of datafile A begins at 9:15 and completes at 9:25 then your backup of data file B starts at 9:35 and ends at 10:00 what does that mean for a restore to a point in time at 9:30. Well if you are only recover datafile A then you are good. However, if you are trying to recover data file B then you are out of luck.
Here is the test case. I backed up my database with level 0 and it ran between '2010_09_13_14:24:36' and '2010_09_13_14:25:17'
RMAN> run {
2> set until time '2010_09_13_14:25:00';
3> restore database;
4> recover database;
5> }
executing command: SET until clause
using target database control file instead of recovery catalog
Starting restore at 2010_09_13_14:48:22
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=154 devtype=DISK
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of restore command at 09/13/2010 14:48:23
RMAN-06026: some targets not found - aborting restore
RMAN-06023: no backup or copy of datafile 4 found to restore
RMAN-06023: no backup or copy of datafile 2 found to restore
RMAN> run {
2> set until time '2010_09_13_14:25:00';
3> restore datafile 3;
4> }
executing command: SET until clause
Starting restore at 2010_09_13_14:59:32
using channel ORA_DISK_1
channel ORA_DISK_1: restoring datafile 00003
input datafile copy recid=32 stamp=729613500 filename=/u08/flash_recovery_area/PRIMETEST/datafile/o1_mf_sysaux_68wv3n4w_.dbf
destination for restore of datafile 00003: /u04/oradata/primetest/primetes/sysaux01.dbf
channel ORA_DISK_1: copied datafile copy of datafile 00003
output filename=/u04/oradata/primetest/primetes/sysaux01.dbf recid=37 stamp=729615575
Finished restore at 2010_09_13_14:59:35
RMAN> recover database;
Starting recover at 2010_09_13_14:59:51
using channel ORA_DISK_1
starting media recovery
media recovery complete, elapsed time: 00:00:00
Finished recover at 2010_09_13_14:59:51
RMAN> run {
2> set until time '2010_09_13_14:25:00';
3> restore datafile 4;
4> }
executing command: SET until clause
Starting restore at 2010_09_13_15:00:11
using channel ORA_DISK_1
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of restore command at 09/13/2010 15:00:11
RMAN-06026: some targets not found - aborting restore
RMAN-06023: no backup or copy of datafile 4 found to restore
Edited by: Tim Boles on Sep 13, 2010 11:49 AM
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Tim Boles