If you take away the CREATE SESSION privilege from a user, you can use the REVOKE command as shown in the following example script:

>.insqlplus /nolog

SQL> connect SYSTEM/globalguideline

SQL> REVOKE CREATE SESSION FROM dev;

Revoke succeeded.

SQL> GRANT CREATE SESSION TO dev;

Grant succeeded.

This script restored the CREATE SESSION privilege to user "dev", so you can continue other example scripts below.