Oracle 11g Encryption Can somebody please tell me how to encrypt an existing tablespace in 11g? The wallet has been setup and the sqlnet.ora points to it.
SQL&gt; select STATUS  FROM V$ENCRYPTION_WALLET;

STATUS
------------------
OPEN

I alter the tablespace offline ...
alter tablespace USERS offline normal;

But I can only find the 12n and above command for the next part:
ALTER TABLESPACE users ENCRYPTION OFFLINE ENCRYPT;

Many thanks in advance for the 11g command.
Encrypting an existing tablespace became possible in 12.2.
11g documentation:
Creating an Encrypted Tablespace

You cannot encrypt an existing tablespace.

12.1 documentation:
About Creating Encrypted Tablespaces

You cannot change an existing tablespace to make it encrypted.