What happens when you take a tablespace datafile offline immediate?

When a tablespace is taken offline, the database takes all the associated files offline. You cannot take the following tablespaces offline: SYSTEM.

How do I drop datafile offline?

To take a datafile offline when the database is in NOARCHIVELOG mode, use the ALTER DATABASE statement with both the DATAFILE and OFFLINE FOR DROP clauses. The OFFLINE keyword causes the database to mark the datafile OFFLINE , whether or not it is corrupted, so that you can open the database.

How do I know if my datafile is offline or online?

Connect sys/password as sysdba in sqlplus and run the following query to find which datafiles are offline: Select file# from v$datafile where status = ‘OFFLINE’; Note all file# numbers that are returned. Then, while in sqlplus connected to the database as sys/password as sysdba.

Can we drop offline datafile in Oracle?

You cannot drop datafiles in the SYSTEM tablespace. If a datafile in a locally managed tablespace is offline, it cannot be dropped.

How do I undo offline tablespace?

If there are Undo segments with status other than OFFLINE in the tablespace to be dropped, we need to wait till they become OFFLINE. sql> select status,segment_name from dba_rollback_segs where status not in (“OFFLINE’) and tablespace_name=[undo tablespace to be dropped];

What is temporary tablespace in Oracle?

Temporary tablespaces are used for storing temporary data, as would be created when SQL statements perform sort operations. An Oracle database gets a temporary tablespace when the database is created. You would create another temporary tablespace if you were creating a temporary tablespace group.

How do I drop a data file?

Procedure to drop the datafile till 10gR2

  1. Create a new oracle tablespace to hold moved objects.
  2. Move all tables to the new tablespace.
  3. Move all indexes to the new tablespace.
  4. Move all other segments to the new tablespace.
  5. Drop the old tablespace using the INCLUDING CONTENTS and datafiles option.

Can we drop a datafile in Oracle?

Once the tablespace has been dropped, you can then physically remove the datafile from your system using an operating system command, if you so choose. This command will not drop the datafile, it will simply take the datafile offline and Oracle will no longer attempt to access it.

How do I check datafiles in backup mode?

To check whether a datafile is part of a current online tablespace backup, query the V$BACKUP view. This view is useful only for user-managed online tablespace backups, because neither RMAN backups nor offline tablespace backups require the datafiles of a tablespace to be in backup mode.

How do I recover a lost datafile in Oracle?

How to recover missing datafiles?

  1. Find the missing datafiles:
  2. Take tablespace or datafiles offline:
  3. Rename missing datafiles with original files:
  4. Shutdown and mount the database:
  5. Perform media recovery:
  6. Open the database:
  7. check the status of datafiles:
  8. Bring the datafiles online:

How do I drop datafiles?

How to Drop a datafile from Tablespace in Oracle

  1. Create a new oracle tablespace to hold moved objects.
  2. Move all tables to the new tablespace.
  3. Move all indexes to the new tablespace.
  4. Move all other segments to the new tablespace.
  5. Drop the old tablespace using the INCLUDING CONTENTS and datafiles option.

How do I make temp files offline?

To take a datafile offline or bring it online, you must have the ALTER DATABASE system privilege. To take all datafiles or tempfiles offline using the ALTER TABLESPACE statement, you must have the ALTER TABLESPACE or MANAGE TABLESPACE system privilege.