Online vs Read Write

I have a confusion in following commands about tablespace.
When should we use Online and Read Write.
SQL> ALTER TABLESPACE imp_dat ONLINE ;
SQL> ALTER TABLESPACE imp_dat READ WRITE ;
If ONLINE tablespace allow READ/WRITE both, then why is Read Write for?
Need more clarifications plz.

do you want to know the difference between ONLINE/OFFLINE and READ ONLY/WIRTE.
if the tablespace is READ ONLY it is available to select the data from.
if the tablespace is OFFLINE then you can not even select from it.
hope this is the answer of you question.

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