I'm trying to recover the applications of an Oracle APEX workspace deleted accidentally. The database is 12c and APEX 18.1
What would be the best way to go about it, if the only backup available is an OS level backup of the oradata folder (with all Tablespace files) ?. My APEX schema lives on its own tablespace. Can I simply copy over last night's copy of the APEX table space file over the current one to restore ?
There are no RMAN backups, and the database is installed with all default options, no archive log and no flashback. I also don't have any dump produced with expdp.
I've already tried to use the dbms_flashback package to go back a few hours but to no avail, as I get an error about rollback segment too small. The earliest I can make it work, is already at a state after the desired recovery point.
Clarification
I am assuming you only lost the APEX tablespace but your database is currently functioning. If this is the case, and assuming your APEX tablespace does not span multiple datafiles, you can attempt to swap out the datafile. Please force a backup in rman before trying any of this.
There are a few different options here. All you really need are the following
Datafile
Control file
Archive / redologs (if you want to move forward or backward in time)
I'm going to outline two options because I don't have all the pertinent information. The first option attempts to actually restore the datafiles through rman, the second one simply swaps it out. The first is obviously preferential but may not be achievable.
RMAN Restore
First set the following parameter in your init.ora file
_allow_resetlogs_corruption=TRUE
Move your entire oradata backup directory to /tmp/oradata. Locate then location of your dbf and ctl files in that directory.
Then run rman target / from bash terminal. In rman run the following.
RESTORE CONTROLFILE FROM '/tmp/oradata/your_ctrl_file_dir'
ALTER TABLESPACE apex OFFLINE IMMEDIATE';
SET NEWNAME FOR DATAFILE '/tmp/oradata/apex01.dbf' TO
RESTORE TABLESPACE apex;
SWITCH DATAFILE ALL;
RECOVER TABLESPACE apex;
Swap out Datafile
First find the location of your datafiles. You can find them by running the following in sqlplus / as sysdba or whatever client you use
spool '/tmp/spool.out'
select value from v$parameter where name = 'db_create_file_dest';
select tablespace name from dba_data_files;
View the spool.out file and
Verify the location of your datafiles
See if the datafile still is associated with that tablespace.
If the tablespace is still there run
select file_name, status from dba_data_files WHERE tablespace name = < name >
You want your your datafile to be available. Then you want to set the tablespace to read only and take it offline
alter tablespace < name > read only;
alter tablespace < name > offline;
Now copy your dbf file the directory returned from querying db_create_file_dest value. Don't overwrite the old one, then run.
alter tablespace < name > rename datafile '/u03/waterver/oradata/yourold.dbf' to '/u03/waterver/oradata/yournew.dbf'
This updates your controlfile to point to the new datafile.
You can then bring your tablespace back online and back in read write mode. You may also want to verify the status of the tablespace status, the name of the datafile associated with that tablespace, etc.
Related
SQL> alter database drop tablespace XXX including contents and datafiles;
alter database drop tablespace XXX including contents and datafiles
*
ERROR at line 1:
ORA-01900: LOGFILE keyword expected
Note : I do not have datafile regarding this tablespace I have deleted it manually.
Please advice me and also if any article regarding backup tablespaces please share
You seem to be mixing up syntax from different commands. drop tablespace is a standalone statement:
The alter database statement is separate; it has a drop logfile clause, but not drop tablespace. The parser is seeing the drop ... in your statement and is expecting the next word to therefore be logfile - and since it isn't, it generates the error you see.
So you only need to do:
drop tablespace XXX including contents and datafiles;
(assuming you're really sure you do want to get rid of it permenantly, of course!)
I have created the datafiles in an external hard disk for a particular db . When the hard disk is connected I am able to run the server without any issues . Now when I remove the hard disk and try running the server , it throws error saying
NO DATAFILE PATH Found
This is because the path of datafiles is in the external hard disk .
Now, is there anyway i can run the server against the same database even if the hard disk is not connected ?
Assuming the real question is how to get the external disk datafiles onto the local system, have a look here :
https://docs.oracle.com/cd/B28359_01/server.111/b28310/dfiles005.htm
Outline steps:
Procedure for Renaming Datafiles in a Single Tablespace
To rename datafiles in a single tablespace, complete the following steps:
Take the tablespace that contains the datafiles offline. The database must be open.
For example:
ALTER TABLESPACE users OFFLINE NORMAL;
Rename the datafiles using the operating system - in your case COPY the files from the external disk to local disk
Use the ALTER TABLESPACE statement with the RENAME DATAFILE clause to change the filenames within the database.
For example, the following statement renames the datafiles /u02/oracle/rbdb1/user1.dbf and /u02/oracle/rbdb1/user2.dbf to/u02/oracle/rbdb1/users01.dbf and /u02/oracle/rbdb1/users02.dbf, respectively:
ALTER TABLESPACE users
RENAME DATAFILE '/u02/oracle/rbdb1/user1.dbf',
'/u02/oracle/rbdb1/user2.dbf'
TO '/u02/oracle/rbdb1/users01.dbf',
'/u02/oracle/rbdb1/users02.dbf';
Always provide complete filenames (including their paths) to properly identify the old and new datafiles. In particular, specify the old datafile name exactly as it appears in the DBA_DATA_FILES view of the data dictionary.
Back up the database. After making any structural changes to a database, always perform an immediate and complete backup.
I am trying drop the temp tables space it has three files
/tmp/TEMPRM/create/TEMPRM/datafile/o1_mf_temprm_t_bw3t4zkp_.tmp
+TEMPDATA/rm/datafile/temprm_tempfile_1.dbf
+TEMPDATA/rm/datafile/temprm_tempfile_2.dbf
Before dropping table space I want to delete all the file, I am able to remove the first two files last one gives the error.
SQL> SQL> ALTER TABLESPACE TEMPRM_TEMP DROP TEMPFILE '+TEMPDATA/rm/datafile/temprm_tempfile_2.dbf'
*
ERROR at line 1:
ORA-03261: the tablespace TEMPRM_TEMP has only one file
If it is not allowed to delete all the files in table space, How to clean the table space?
You cannot make a tablespace file-less. You can however drop a tablespace and it's datafiles in one statement:
DROP TABLESPACE temp_tablespace including contents and datafiles;
Make sure that you have a new temporary tablespace and make it the default before you drop the old one. Follow the below link for an example:
http://dbatricksworld.com/how-to-create-temporary-tablespace-and-drop-existing-temprary-tablespace-in-oracle-11g/
create a new temp tablespace, make this the default for the users. Once there are no connections using the old temp tablespace you should be able to drop the old temp tablespace
Unfortunately one UNDO data file was misplaced in wrong location when I was adding space. I want to move that file to correct location. As it is Production database, I don't want to disturb the ongoing transactions. Can I offline that particular undo data file, while moving... will Database work normally with zero data loss?
Version Of Oracle DB: 11.2.0.4.0
can any one suggest?
During database running and in 24/7 environment, you should need to create new undo tablespace with new location of undo datafile. After creating this newer tablespace, you can switch older to newer undo tablespace online without affecting any ongoing transactions.
Following example shows how to achieve your goal. Using this trick, you can avoid data loss.
SQL>create undo tablespace undotbs2 datafile '/yournewlocation/undotbs02.dbf' size 1000m;
Now set new undo tablespace as default undo tablespace using following command as SYSDBA in SQLPLUS
SQL> alter system set undo_tablespace= undotbs2 ;
After finishing above task you can drop old undotbs tablespace from database using following command.
SQL> drop tablespace undotbs including contents;
I would consider creating the undo tablespace as a BIGFILE datafile:
CREATE BIGFILE UNDO TABLESPACE UNDOTBS02
DATAFILE '/yournewlocation/UNDOTBS02.dbf'
SIZE 100M AUTOEXTEND ON NEXT 100M
MAXSIZE 500G; --or whatever size you consider sufficient for your DB
I would also alter the system with a scope of BOTH, to make sure the change is made in both memory and spfile:
ALTER SYSTEM SET UNDO_TABLESPACE=UNDOTBS02 SCOPE=BOTH;
Then, provided all active transactions and the UNDO_RETENTION period (if any) are done, you'll be able to drop the tablespace as described by doc123.
How can we shrink temp tablespace in oracle? And why it is increasing so much like upto 25 GB since there is only one schema in the database for the application and data table space size is 2 GB and index table space size is 1 GB used.
Oh My Goodness! Look at the size of my temporary table space!
Or... how to shrink temporary tablespaces in Oracle.
Yes I ran a query to see how big my temporary tablespace is:
SQL> SELECT tablespace_name, file_name, bytes
2 FROM dba_temp_files WHERE tablespace_name like 'TEMP%';
TABLESPACE_NAME FILE_NAME BYTES
----------------- -------------------------------- --------------
TEMP /the/full/path/to/temp01.dbf 13,917,200,000
The first question you have to ask is why the temporary tablespace is so large.
You may know the answer to this off the top of your head. It may be due to a
large query that you just run with a sort that was a mistake (I have done that
more than once.) It may be due to some other exceptional circumstance. If that
is the case then all you need to do to clean up is to shrink the temporary
tablespace and move on in life.
But what if you don't know? Before you decide to shrink you may need to do some
investigation into the causes of the large tablespace. If this happens on a
regular basis then it is possible that your database just needs that much space.
The dynamic performance view
V$TEMPSEG_USAGE
can be very useful in determining the cause.
Maybe you just don't care about the cause and you just need to shrink it.
This is your third day on the job. The data in the database is only 200MiB
if data and the temporary tablespace is 13GiB - Just shrink it and move on.
If it grows again then we will look into the cause. In the mean time I am
out of space on that disk volume and I just need the space back.
Let's take a look at shrinking it. It will depend a little on what version
of Oracle you are running and how the temporary tablespace was set up.
Oracle will do it's best to keep you from making any horrendous mistakes
so we will just try the commands and if they don't work we will shrink
in a new way.
First let's try to shrink the datafile. If we can do that then we get back
the space and we can worry about why it grew tomorrow.
SQL>
SQL> alter database tempfile '/the/full/path/to/temp01.dbf' resize 256M;
alter database tempfile '/the/full/path/to/temp01.dbf' resize 256M
*
ERROR at line 1:
ORA-03297: file contains used data beyond requested RESIZE value
Depending on the error message you may want to try this with different sizes
that are smaller than the current site of the file. I have had limited
success with this. Oracle will only shrink the file if the temporary tablespace
is at the head of the file and if it is smaller than the size you
specify. Some old Oracle documentation (they corrected this) said that
you could issue the command and the error message would tell you what
size you could shrink to. By the time I started working as a DBA this was
not true. You just had to guess and re-run the command a bunch of times
and see if it worked.
Alright. That didn't work. How about this.
SQL> alter tablespace YOUR_TEMP_TABLESPACE_NAME shrink space keep 256M;
If you are in 11g (Maybee in 10g too) this is it! If it works you may want
to go back to the previous command and give it some more tries.
But what if that fails. If the temporary tablespace is the default temporary
that was set up when the database was installed then you may need to do a
lot more work. At this point I usually re-evaluate if I really need that
space back. After all disk space only costs $X.XX a GiB. Usually I don't want
to make changes like this during production hours. That means working at 2AM
AGAIN! (Not that I really object
to working at 2AM - it is just that... Well I like to sleep too. And my wife
likes to have me at home at 2AM... not roaming the downtown streets at 4AM trying
to remember where I parked my car 3 hours earlier. I have heard of that "telecommuting"
thing. I just worry that I will get half way through and then my internet connectivity
will fail - then I have to rush downtown to fix it all before folks show up in the
morning to use the database.)
Ok... Back to the serious stuff...
If the temporary tablespace you want to shrink is your default
temporary tablespace, you will have to first create a new temporary
tablespace, set it as the default temporary tablespace then drop
your old default temporary tablespace and recreate it. Afterwords
drop the second temporary table created.
SQL> CREATE TEMPORARY TABLESPACE temp2
2 TEMPFILE '/the/full/path/to/temp2_01.dbf' SIZE 5M REUSE
3 AUTOEXTEND ON NEXT 1M MAXSIZE unlimited
4 EXTENT MANAGEMENT LOCAL UNIFORM SIZE 1M;
Tablespace created.
SQL> ALTER DATABASE DEFAULT TEMPORARY TABLESPACE temp2;
Database altered.
SQL> DROP TABLESPACE temp INCLUDING CONTENTS AND DATAFILES;
Tablespace dropped.
SQL> CREATE TEMPORARY TABLESPACE temp
2 TEMPFILE '/the/full/path/to/temp01.dbf' SIZE 256M REUSE
3 AUTOEXTEND ON NEXT 128M MAXSIZE unlimited
4 EXTENT MANAGEMENT LOCAL UNIFORM SIZE 1M;
Tablespace created.
SQL> ALTER DATABASE DEFAULT TEMPORARY TABLESPACE temp;
Database altered.
SQL> DROP TABLESPACE temp2 INCLUDING CONTENTS AND DATAFILES;
Tablespace dropped.
Hopefully one of these things will help!
The options for managing tablespaces have got a lot better over the versions starting with 8i. This is especially true if you are using the appropriate types of file for a temporary tablespace (i.e. locally managed tempfiles).
So, it could be as simple as this command, which will shrink your tablespace to 128 meg...
alter tablespace <your_temp_ts> shrink space keep 128M;
The Oracle online documentation is pretty good. Find out more.
edit
It would appear the OP has an earlier version of the database. With earlier versions we have to resize individual datafiles. So, first of all, find the file names. One or other of these queries should do it...
select file_name from dba_data_files where tablespace_name = '<your_temp_ts>'
/
select file_name from dba_temp_files where tablespace_name = '<your_temp_ts>'
/
Then use that path in this command:
alter database datafile '/full/file/path/temp01.dbf' resize 128m
/
You should have written what version of Oracle you use. You most likely use something else than Oracle 11g, that's why you can't shrink a temp tablespace.
Alternatives:
1) alter database tempfile '[your_file]' resize 128M; which will probably fail
2) Drop and recreate the tablespace. If the temporary tablespace you want to shrink is your default temporary tablespace, you may have to first create a new temporary tablespace, set it as the default temporary tablespace then drop your old default temporary tablespace and recreate it. Afterwards drop the second temporary table created.
3) For Oracle 9i and higher you could just drop the tempfile(s) and add a new one(s)
Everything is described here in great detail.
See this link: http://databaseguide.blogspot.com/2008/06/resizing-temporary-tablespace.html
It was already linked, but maybe you missed it, so here it is again.
It will be increasing because you have a need for temporary storage space, possibly due to a cartesian product or a large sort operation.
The dynamic performance view V$TEMPSEG_USAGE will help diagnose the cause.
Temporary tablespaces are used for database sorting and joining operations and for storing global temporary tables. It may grow in size over a period of time and thus either we need to recreate temporary tablespace or shrink it to release the unused space.
Steps to shrink TEMP Tablespace
alter database datafile 'C:\ORA_SERVER\ORADATA\AXAPTA\AX_DATA.ORA' resize 40M;
If it doesn't help:
Create new tablespace
Switch to new temporary tablespace
Wait until old tablespace will not be used
Delete old tablespace
I don't bother with dropping the alternate temp in case i need to reclaim storage again in the future...
from temp group set default to stand-alone temp
wait awhile, then resize members of temp group
set default back to temp group
wait awhile, resize stand alone temp. there's no rush to do the last step