alter database move datafile tips

Oracle Tips by Burleson Consulting

October 15, 2015

Question: How does the automatic data file move feature in 12c?

Answer: Simply, you can now move a datafile while the database is up and accepting updates. In the example below, we move the system tablespace datafile from one mount point to another, all while the database is active:

alter database
   move datafile
   '/u01/app/oracle/oradata/system.dbf'
to
   '/u02/app/oracle/oradata/my12c_db/system.dbf';

Also, starting in Oracle 12c you can now move a datafile from number, such that you can select a specific datafile number and move it to a new named locations, without specifying the old datafile name:

SQL> select file#,name from v$datafile where file#=1;

FILE#      NAME
---------- -------------------------------------------------------
1         /u01/app/oracle/oradata/sid1/myfile.dbf

1 rows selected.

SQL> alter database move datafile 1 to '/tmp/myfile.dbf';

Database altered.

SQL> select file#,name from v$datafile where file#=1;

FILE#      NAME
---------- ------------------------------------------------------- 1          /tmp/myfile.dbf

1 rows selected.

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