ORA-00021
Cannot switch session because that session is being used by other users.
Cause
The session is currently used by other users.
Action
Do not attempt to switch to a session in use by other users.
ORA-00021
session attached to some other process; cannot switch session
Cause
The user session is currently used by others.
Action
Do not switch to a session attached to some other process.
ORA-00021
session attached to some other process; cannot switch session
Cause
The user session is currently used by others.
Action
Do not switch to a session attached to some other process.
