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Is it necessary to back up the whole database when moving a datafile [message #649336]

Tue, 22 March 2016 17:56

juniordbanewbie
Messages: 250
Registered: April 2014

Senior Member

Dear all,

from https://docs.oracle.com/cd/E11882_01/server.112/e25494/dfiles.htm#ADMIN11431

Quote:

Procedure for Renaming Data Files in a Single Tablespace
.....
Back up the database. After making any structural changes to a database, always perform an immediate and complete backup.

as I've a 1.3 TB of database, the backup for the database is going to take about 6 and half hours, is it okay to backup just the tablespace involved.

if taking a backup of the database is required, then I presumed I should move the datafile just before a full backup is scheduled. right?
btw can it be a incremental level 1 database backup?

thanks a lot!

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Re: Is it necessary to back up the whole database when moving a datafile [message #649337 is a reply to message #649336]

Tue, 22 March 2016 18:04

BlackSwan
Messages: 26766
Registered: January 2009
Location: SoCal

Senior Member

What exactly is the reason for renaming data files for a single tablespace?

no backup is ever required.

It is your database & you are free to be as cavalier as you deem appropriate

>is it okay to backup just the tablespace involved.
assuming you only backup the the tablespace involved, what can you recover should the disk array melt down immediately after the rename completes?

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Re: Is it necessary to back up the whole database when moving a datafile [message #649338 is a reply to message #649337]

Tue, 22 March 2016 18:45

juniordbanewbie
Messages: 250
Registered: April 2014

Senior Member

[oracle@berlin-db ~]$ df -h
Filesystem                         Size  Used Avail Use% Mounted on
/dev/mapper/rhel_berlin--db-root   22G   14G  8.2G  63% /
devtmpfs                            16G     0   16G   0% /dev
tmpfs                               16G  6.5G  9.3G  41% /dev/shm
tmpfs                               16G   65M   16G   1% /run
tmpfs                               16G     0   16G   0% /sys/fs/cgroup
/dev/sdg                           355G   90G  247G  27% /u05
/dev/sdb                           355G  303G   34G  90% /u04
/dev/sdf                           355G  310G   27G  93% /u03
/dev/sde                           355G  304G   33G  91% /u02
/dev/sdd                           355G  332G  4.3G  99% /u01
/dev/sdh                           837G  483G  312G  61% /import2
/dev/sdc                          1008G  4.1G  953G   1% /import
/dev/sda1                          497M  120M  378M  24% /boot
/dev/sdi1                          4.0T  415G  3.6T  11% /u06

I need to do an out of place upgrade and obviously there's no more space in /u01 that's why I need to move one datafile out to another location where there's more free space

>is it okay to backup just the tablespace involved.
assuming you only backup the the tablespace involved, what can you recover should the disk array melt down immediately after the rename completes?
=>I cannot recover anything since it's a hardware issue and we have to install server with new hardware first before even beginning recovery operation.

no backup is ever required.

It is your database & you are free to be as cavalier as you deem appropriate

so why is database documentation is saying

Quote:

Back up the database. After making any structural changes to a database, always perform an immediate and complete backup.

of course I believe we should do a controlfile trace backup before and after the renaming operation.

thanks a lot!

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Re: Is it necessary to back up the whole database when moving a datafile [message #649342 is a reply to message #649336]

Wed, 23 March 2016 02:01

John Watson
Messages: 8989
Registered: January 2010
Location: Global Village

Senior Member

I see no reason for an additional backup at that point. All previous backups are still valid after renaming a datafile.

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