Oracle® Database Administrator's Guide 11g Release 1 (11.1) Part Number B28310-01 |
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You use the DROP
DATAFILE
and DROP
TEMPFILE
clauses of the ALTER
TABLESPACE
command to drop a single datafile or tempfile. The datafile must be empty. (A datafile is considered to be empty when no extents remain allocated from it.) When you drop a datafile or tempfile, references to the datafile or tempfile are removed from the data dictionary and control files, and the physical file is deleted from the file system or Automatic Storage Management (ASM) disk group.
The following example drops the datafile identified by the alias example_df3.f
in the ASM disk group DGROUP1
. The datafile belongs to the example
tablespace.
ALTER TABLESPACE example DROP DATAFILE '+DGROUP1/example_df3.f';
The next example drops the tempfile lmtemp02.dbf
, which belongs to the lmtemp
tablespace.
ALTER TABLESPACE lmtemp DROP TEMPFILE '/u02/oracle/data/lmtemp02.dbf';
This is equivalent to the following statement:
ALTER DATABASE TEMPFILE '/u02/oracle/data/lmtemp02.dbf' DROP INCLUDING DATAFILES;
See Oracle Database SQL Language Reference for ALTER
TABLESPACE
syntax details.
Restrictions for Dropping Datafiles
The following are restrictions for dropping datafiles and tempfiles:
The database must be open.
If a datafile is not empty, it cannot be dropped.
If you must remove a datafile that is not empty and that cannot be made empty by dropping schema objects, you must drop the tablespace that contains the datafile.
You cannot drop the first or only datafile in a tablespace.
This means that DROP
DATAFILE
cannot be used with a bigfile tablespace.
You cannot drop datafiles in a read-only tablespace.
You cannot drop datafiles in the SYSTEM
tablespace.
If a datafile in a locally managed tablespace is offline, it cannot be dropped.
See Also:
Dropping Tablespaces