Oracle: How to reorganize data in a tablespace

There is actually no easy way to reorganize the data in a tablespace in Oracle11g.
You can't just use a command like ALTER TABLESPACE REORGANIZE or REORGANIZE TABLESPACE because there is no.

TNS-12508: TNS:listener could not resolve the COMMAND given

TNS-12508: TNS:listener could not resolve the COMMAND given

this error could indicate that you have typed the wrong command in lsnrctl or it could indicate that the parameter:

 

ADMIN_RESTRICTIONS_YOURLISTENERNAME = ON

is set in listener.ora (located in $ORACLE_HOME/network/admin) and you don't have permission to adminster the listener. With this parameter set it is only the user oracle that is allowed to run commands against the listener.