Performing a copy of a "live" data file?

Hello -
Is there a risk (to the source data file) of performing a copy command on a live data file? My sys admin informed me he was copying a data file. He was not concerned about the file on the destination drive being corrupted. He just had to fill up another file system to perform a test. My concern was any potential corruption to the "live" DB file.
Thanks,
mike

I agree that copying a file should be 0% risk of corruption on the source datafile.
Let's think about this. How does a conventional backup work? We put the tablespace in backup mode, and then use O/S level tools to make the copy. All that putting the tablespace in backup mode does is write to the datafile header of each datafile in the tablespace, and increases I/O by writing some full blocks to the redo log. After that, the O/S level copy simply copies the datafiles. If someone comes along and just copies the datafiles, the O/S copy mechanism is the very same as if you were doing a conventional backup. There is no difference.
So, if you believe that copying a file can damage the source file, then how do you reliably backup your database files without having to resort to a cold backup?
Copying files doesn't damage the source file. Having said that, I agree that the sysadmin should not be messing with Oracle datafiles. Today he uses the files as source to copy from, tomorrow he removes, renames, whatever. Teach him to use dd to create large files.
dd if=/dev/zero of=/tmp/my_2gb_file bs=1048576 count=2048
Hope that helps,
-Mark

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<REMOVED BY MODERATOR>
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Just trying out an old version of Dreamweaver MX 2004. I am
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The file is created on the fly and then immediately deleted by
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It turns out that Dreamweaver is always setting the file
permissions on file uploads (checked php and html) to the
remote/testing server to include group=rw. Once I set it manually
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I checked with the webhosting company and their second-line
have reported back to me that the default file permission they set
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using WS-FTP to upload the same file (renamed) to the same target
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Can anyone please tell me how to change the permissions DW
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Stop using Live Data with a hosting account. Set up PHP and
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in DW to use
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fully tested.
Tom Muck
http://www.tom-muck.com/
"nigelssuk" <[email protected]> wrote in
message
news:[email protected]...
> Just trying out an old version of Dreamweaver MX 2004. I
am using my
> webhosting
> service for remote server/testing server duties. It is
running PHP 4.3.10
> and
> MySQL 3.23.58. I was able to set up the database
connection and
> test-retrieve a
> recordset with no problems. In following the tutorial I
found that
> Livedata
> wouldn't work, it just giving me a warning about file
permissions being
> wrong.
> It turns out that when Dreamweaver creates a temporary
file of the
> work-in-progress to upload to the remote server the file
is created on the
> server with owner=rw, group=rw, world=r which explains
why it won't run -
> group
> has to be set to group=r. The file is created on the fly
and then
> immediately
> deleted by Dreamweaver so it is impossible to manually
set the permission
> on
> the server and probably fairly pointless too.
>
> I tried just saving the file and previewing in the
browser which again
> causes
> it to be uploaded to the remote server. The first time
this resulted in
> the
> browser offering a file download box instead of running
the page. The
> reason is
> - again - that Dreamweaver is setting the uploaded file
permissions to
> include
> group=rw. If I manually set the permission for group to
group=r it runs
> fine.
>
> It turns out that Dreamweaver is always setting the file
permissions on
> file
> uploads (checked php and html) to the remote/testing
server to include
> group=rw. Once I set it manually on the remote/testing
server to group=r
> for a
> php file everything is fine and subsequent uploads of
the same file do not
> change it again.
>
> I checked with the webhosting company and their
second-line have reported
> back
> to me that the default file permission they set on
uploaded files includes
> group=r so it must be DW that is causing the problem by
setting group=rw
> the
> first time. I confirmed this by using WS-FTP to upload
the same file
> (renamed)
> to the same target directory and the permissions set
were owner=rw,
> group=r,
> world=r.
>
> So
>
> Can anyone please tell me how to change the permissions
DW sets on files
> written to a remote server because I have spent
countless hours on it
> without
> success. From looking at other posts in this forum it
could be that other
> users
> are hitting the same kind of problem with DW8
>

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Ullhas wrote:
I have a general query regarding size of data files.
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