Data files are offline / tablespace offline

I am confused on the concept of data file offline.
What happened when you take data file offline?
Is data file offline because of disk damage? we see the error that data file is haning a problem, we have manually to take data file offline? how?
Why is tablespace offline but data file is still online?
Please help!
Thanks
S.

ski123 wrote:
I am confused on the concept of data file offline.
What happened when you take data file offline?The offline datafile means simply that the file is not available anymore for the access. All the objects for the offline file become inaccessible for the users to access.
Is data file offline because of disk damage? we see the error that data file is haning a problem, we have manually to take data file offline? how?Yes it can happen that the data file goes offline because of any kind of damage either over the disk, or also with the file itself. For example, there may be a chance that the file is not available anymore , may be because someone has deletedthe file. So most of the times, Oracle would offline the file by itself. In any case, if the file doesn't go offline by itself than you need to take it offline yourself as the recovery for the file can't happen if its online. You would get the error messages that oracle can't acquire the exclusive access over the file.
Why is tablespace offline but data file is still online?Not sure that I did see this ever myself. Tablespace is nothing but the container for the datafile so if there is a file of it which is offline and that's the only file in the tablespace, the tablespace can't stay as online. Show us an output for the same.
The links given by Anantha are must for you to read the cocept of offlining a tablespace. Make sure you read them for sure.
HTH
Aman....

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If data files are deleted?

If data files are deleted, can they be recovered from the control file?

It depends on what is in the datafiles in the tablespaces, if they actually contain data, if they are the only datafiles for the tablespace, etc.
Let's assume that they are the only datafiles for the tablespace and segments have allocated and used space in them.
If the segments are index segments, you can recreate the indexes from the data that currently exists in the table.
If the segments are table segments, you will need to recreate the data either by hand or extracting it from another source.
If no segment has allocated space in the datafile, you should be able to offline the datafile. If this works, it is a good idea to migrate the segments to a new tablespace and then drop the tablespace (unless it is SYSTEM) as Oracle does not like offline datafiles and it will become a maintenance hassle.
If you do not have a backup, do you have a recent export?
Once you have addressed the immediate issues of reconstructing the data, you need to address the issues of backups (you should at least backup the database periodically even if you don't run in archivelog mode) and security (no one should be dropping live data files).
Regards,
Daniel Fink

How to remove data file from System tablespace

Hi All,
I have wrongly added data file in SYSTEM tablespace, now I want remove it. I have tried to set datafile offline but it is giving me the error system tableapce can not set offline. so please help me. I am working Oracle 10g .
thanks in advance
sv

In 10gR2, you can drop a datafile from tablespace, as long it's empty (and of course not the last one):
ALTER TABLESPACE tbs_03 DROP DATAFILE 'tbs_f04.dbf';
Otherwise, there's no direct way to get rid of the file. You can just shrink it and move (i.e. "rename") it another location. For a non-system tablespace, move of all segments to another tablespace (and later renaming it) would be an option, but this of course won't work with system tablespace.

Data Guard adding new data files to a tablespace.

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My question is, does Data Guard take care of this automaticlly for a physical standby? I can't find any specific reference on how it handles a new datafile.

Never mind, I found the answer.
STANDBY_FILE_MANAGEMENT=auto
Set on the standby database will create the datafiles.

Does anyone know where the iWeb data files are located or what they are called? I can't find them. I looked in Finder for files named the same as my website, but found nothing. Any help would be appreciated.

Does anyone know where the iWeb data files are located or what they are called? I can't find them. I looked in Finder for files named the same as my website, but found nothing. Any help would be appreciated.

If you erased or replaced your hard drive since iWeb was cancelled, then they are gone. Otherwise, if you have maintained backups then check those.
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chflags nohidden ~/Library
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Space allocation on 11g R2 on multiple data files in one tablespace

hello
if the following is explained in Oracle 11g R2 documentation please send a pointer. I cant find it myself right now.
my question is about space allocation (during inserts and during table data load) in one table space containing multiple data files.
suppose i have Oracle 11g R2 database and I am using OMF and Oracle ASM on Oracle Linux 64-bit.
I have one ASM disk group called ASMDATA with 50 ASM disks in it.
I have one tablespace called APPL_DATA with 50 data files on it, each file = 20 GB (equal size), to contain one 1 TB table calll MY_FACT_TABLE.
During Import Data Pump or during application doing SQL Inserts how will Oracle allocate space for the table?
Will it fill up one data file completely and then start allocating from second file and so on, sequentially moving from file to file?
And when all files are full, which file will it try to autoextend (if they all allow autoextend) ?
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thanks.

On 10.2.0.4, regular data files, autoallocate, 8K blocks, I've noticed some unexpected things. I have an old, probably obsolete habit of making my datafiles 2G fixed, except for the last, which I make 200M autoextend max 2G. So what I see happening in normal operations is, the other files fill up in a round-robin fashion, then the last file starts to grow. So it is obvious to me at that time to extend the file to 2G, make it noautoexented, and add another file. My schemata tend to be in the 50G range, with 1 or 2 thousand tables. When I impdp, I notice it sorts them by size, importing the largest first. I never paid too much attention to the smaller tables, since LMT algorithms seem good enough to simply not worry about it.
I just looked (with dbconsole tablespace map) at a much smaller schema I imported not long ago, where the biggest table was 20M in 36 extents, second was 8M in 23 extents, and so on, total around 200M. I had made 2 data files, the first 2G and the second 200M autoextend. Looking at the impdp log, I see it isn't real strong about sorting by size, especially under 5M. So where did the 20M table it imported first end up? At the end of the auotextend file, with lots of free space below a few tables there. The 2G file seems to have a couple thousand blocks used, then 8K blocks free, 5K blocks used, 56K blocks free, 19K blocks used, 148K free (with a few tables scattered in the middle of there), 4K blocks used, the rest free. Looking at an 8G similar schema, looks like the largest files got spread across the middle of the files, then the second largest next to it, and so forth, which is more what I expected.
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After a long and painful research i have finally found usable way to make distutils propagate location of data files to installed application.
Python's distutils allow user to specify location for data_files but there's no standard way to acess them.
Yes sure ,there are few workarounds :
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New command to install process:
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user_options = []
def initialize_options(self):
pass
def finalize_options(self):
pass
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def patch(self, ini_file):
print 'patching file' + ini_file
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file_data = infile.readlines()
with open(ini_file,'w') as outfile:
for line in file_data:
_line = self.patch_line(line)
if _line:
line = _line
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if not match:
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line = match.group('identifier')
line += ' = '
data = '(self).distribution.get_command_obj(\''+\
match.group('command')+'\')'+'.'+\
match.group('variable')
line += '\''+eval(data)+'\''
line += '\n'
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Also notice that in 'develoment environment' location of data files differs from 'installation environment'. Cute, isn't it?.
Now you just have to evaluate package ini (propably in myverycoolpackage/__init__.py):
with open(inipath) as ini:
for line in ini.readlines():
exec(line)
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Can I reimport originals after data files are deleted?

While selecting photos to burn to a cd I copied folders from the 'Data' folder in iPhoto library. I then moved several individual files, which I did not require for the burn, from the cd to trash - before I had burned. I did not realise that this would delete the data files from the iPhoto library itself. I emptied trash before checking back with iPhoto and now, of course, those images disappear from my library whenever I open iPhoto. However, I still have the photos saved in two locations as 'Originals', but when I try to import them back into iPhoto a message appears to tell me they are unreadable. The 'Originals' files are not corrupted, but how do I reimport them into iPhoto so that they reappear in my Library Data folder in their old locations?

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Do you Twango?
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My Outlook Data Files Are Now .OST - How Do I Backup & Recover Local Contacts (I'm using Office 365 Home Premium)?

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Hi,
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Melon Chen
Forum Support
Come back and mark the replies as answers if they help and unmark them if they provide no help.
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Since Leopard upgrade, Quicken data files are corrupted

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Mike Ryan

baltwo...
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Mike Ryan

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Message was edited by: Diavonex

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http://chris.pirillo.com/how-to-move-the-home-folder-in-os-x-and-why/
http://support.apple.com/kb/HT4337
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Always back up your storage device with Time Machine or Disk Utility before you start.
Home Folders not on a Startup volume
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Need to stop your popups cant do up dates files are always corrupted i'll just stick with corel version and add ons

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GB storing deleted data, files are too big!

Hi All
I recorded a full concert, 2-3 hours, 8 audio tracks. This came out to about 4GB. Now I want to edit down each song individually, so I cut everything out but the song, and "Save As..." its own file. After cutting down to one song, the file is still 4GB! It seems that GB still stores all of the deleted data. I want to do this for 20-30 songs, and I don't want each file to be 4GB large. Is there anyway to trim the data that it is retaining?
Thanks

kman wrote:
It's kind of a tedious workaround, especially if I have to go through that for 8 tracks x 30 songs.
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Alter Data file offline to online.

Hello.
( DATA FILES ARE IN OFFLINE and ONLINE )
In Sql prompt ,
I can using below command
" ALTER DATABASE DATAFILE 'BANK_DAT.dat' OFFLINE " ;
1).IN THAT CASE ,I GET A ERROR (disallowed unless media recovery enebled )
so i change to Noarchivelog mode using below command
" ALTER DATABASE DATAFILE 'BANK_DAT.dat' OFFLINE DROP "
succefully the "BANK_DAT.dat" data file will be OFFLINE.
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SQL> ALTER DATABASE DATAFILE 'BANK_DAT.dat' ONLINE ;
I getting below error.
ORA-01516: nonexistent log file, datafile or tempfile 'bank_dat.dat'
After that ,I can use DBA STUDIO in GUI mode ,Click the DATA FILE ( 'BANK_DAT.dat")
CLICK THE ONLINE RADIO BUTTON AND APPLY .
In these,I getting the error ( "MEDIA RECOVERY ERROE ").
HOW WILL ALTER THE DATA FILE OFFLINE TO ONLINE IN sql> COMMAND.
please reply very early.
null

Hi,
When I take a data file offline, which SCN get frozen? Is it the stop scn in the control file or is it the checkpoint scn in the data file header?
Stop SCN is the SCN which gets recoreded in control file when datafile is backup mode or datafile is offline.
Its checkpoint scn in Data File Header. As you the STOP SCN is going to Updated wehn ever there are changes with respective to the datafile.. as it implicitly says that STOP SCN, wit respective Offline datafile will not Update, until next scn generates (until the data file make online)
- Pavan Kumar N

Data files are offline / tablespace offline

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