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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