Prior to Oracle 12c, if you wanted to move a database’s file, you either had to shutdown the database, or take the datafile/tablespace offline. Here is an example of the steps you might take:
- ALTER TABLESPACE my_ts OFFLINE;
- !mv /old_dir/my_ts01.dbf /new_dir/my_ts01.dbf
- ALTER DATABASE RENAME FILE ‘/old_dir/my_ts01.dbf’ TO ‘/old_dir/my_ts01.dbf’;
- ALTER TABLESPACE my_ts ONLINE;
Now in Oracle 12c, you can do this quite simply with one command and another user can be accessing the file at the same time. To illustrate this, I will create a tablespace, and while moving it have another session access the file.
SQL> create tablespace move_me 2 datafile '/u01/app/oracle/oradata/ora12c/move_me01.dbf' size 5g; Tablespace created. SQL> create table system.test_tab (id number) tablespace move_me; Table created. SQL> insert into system.test_tab values (10); 1 row created. SQL> commit; Commit complete.
Now let’s begin the move of this file.
SQL> alter database move datafile 2 '/u01/app/oracle/oradata/ora12c/move_me01.dbf' to 3 '/u02/app/oracle/oradata/ora12c/move_me01.dbf';
At the same time, in another session, let’s insert a row into the only table in this tablespace.
SQL> insert into system.test_tab values (20); 1 row created. SQL> commit;
Commit complete.
As you can see, the transaction was allowed to complete even though we are in the middle of moving the file.
While the file was moving I looked at the contents of both mount points.
[oracle@msp-test-ora12 ora12c]$ ls -l /u01/app/oracle/oradata/ora12c total 8769660 -rw-r----- 1 oracle oinstall 10043392 Sep 17 10:52 control01.ctl -rw-r----- 1 oracle oinstall 10043392 Sep 17 10:52 control02.ctl -rw-r----- 1 oracle oinstall 5368717312 Sep 17 10:52 move_me01.dbf -rw-r----- 1 oracle oinstall 52429312 Sep 17 10:52 redo01.log -rw-r----- 1 oracle oinstall 52429312 Sep 16 22:00 redo02.log -rw-r----- 1 oracle oinstall 52429312 Sep 17 02:00 redo03.log -rw-r----- 1 oracle oinstall 1090527232 Sep 17 10:52 sysaux01.dbf -rw-r----- 1 oracle oinstall 734011392 Sep 17 10:52 system01.dbf -rw-r----- 1 oracle oinstall 68165632 Sep 17 10:45 temp01.dbf -rw-r----- 1 oracle oinstall 471867392 Sep 17 10:52 undotbs01.dbf -rw-r----- 1 oracle oinstall 1073750016 Sep 17 02:06 users01.dbf [oracle@msp-test-ora12 ora12c]$ ls -l /u02/app/oracle/oradata/ora12c total 684044 -rw-r----- 1 oracle oinstall 5368717312 Sep 17 10:52 move_me01.dbf
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Database altered. SQL> select * From system.test_tab; ID ---------- 10 20
