Hiding user input
Sometimes you need to keep something secret (shoulder surfing), this will only work in SQL/Plus or Oracle SQL Developer (F5/Run script mode aka broken SQL/Plus mode).
SET SERVEROUTPUT ON SET VERIFY OFF ACCEPT sekrit PROMPT 'enter a secret (warning we''re going to print it on screen!)' HIDE BEGIN dbms_output.put_line('sekrit: ' || '&sekrit'); END; / If you ran the script correctly, the input dialogue will echo stars * instead of your "secret".
If you can see the data you're entering, you ran Oracle SQL Developer statement mode (CTRL-ENTER).
Sessions
Finding
SET LINESIZE 140 SET PAGESIZE 50 COL sid FORMAT a5 COL serial FORMAT a5 COL username FORMAT a30 COL osuser FORMAT a30 COL machine FORMAT a30 COL client_ip FORMAT a20 SELECT sid, serial# AS serial, osuser, username, machine, logon_time, utl_inaddr.get_host_address(regexp_replace(machine,'^.+\\') ) AS client_ip FROM v$session WHERE username IS NOT NULL AND status <> 'KILLED'; Killing
alter system kill session 'sid,serial#';
Code generated example
SELECT 'alter system kill session ''' ||sid||','||serial#|| ''';' as sql FROM v$session WHERE username = 'VICTIM'; 
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