Phsical and logical

Hi Experts,
The Oracle DB Structure divided into two parts Physical and Logical.
Tablespace are logical, then why its taking space ? in another aspect we have datafiles which contains space , i am little bit confuse about it.
Please explain.
Thanks.

jiana wrote:
NK,
Thanks for the reply.
Is this only for referring the datafile to tablespace ?
You mean to say when we have number of datafiles, so it should be managed in a particaul manner, like that ?
Thanks.A datafile is the physical mean of storage, a tablespace is the logical one. The tablespace is mapped to its datafiles.
Lets use this example:
CREATE TABLESPACE "mytablespace"
DATAFILE '/tmp/datafiles/mytablespacedatafile01.dbf' SIZE 150M;
Most of the times the max datafile size is 32767M, so you can add multiple datafiles to a single tablespace to increase its total capacity.
The naming convention is entirely up to you, you can always use the v$datafile or dba_data_file to see which belongs to what.

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