Dropping a connected user from an Oracle 10g database schema

Solution 1:

To find the sessions, as a DBA use

select sid,serial# from v$session where username = '<your_schema>'

If you want to be sure only to get the sessions that use SQL Developer, you can add and program = 'SQL Developer'. If you only want to kill sessions belonging to a specific developer, you can add a restriction on os_user

Then kill them with

alter system kill session '<sid>,<serial#>'

(e.g. alter system kill session '39,1232')

A query that produces ready-built kill-statements could be

select 'alter system kill session ''' || sid || ',' || serial# || ''';' from v$session where username = '<your_schema>'

This will return one kill statement per session for that user - something like:

alter system kill session '375,64855';

alter system kill session '346,53146';

Solution 2:

Find existing sessions to DB using this query:

SELECT s.inst_id,
       s.sid,
       s.serial#,
       p.spid,
       s.username,
       s.program
FROM   gv$session s
       JOIN gv$process p ON p.addr = s.paddr AND p.inst_id = s.inst_id
WHERE  s.type != 'BACKGROUND';

you'll see something like below.

Then, run below query with values extracted from above results.

ALTER SYSTEM KILL SESSION '<put above s.sid here>,<put above s.serial# here>';

Ex: ALTER SYSTEM KILL SESSION '93,943';

Solution 3:

my proposal is this simple anonymous block:

DECLARE
   lc_username   VARCHAR2 (32) := 'user-name-to-kill-here';
BEGIN
   FOR ln_cur IN (SELECT sid, serial# FROM v$session WHERE username = lc_username)
   LOOP
      EXECUTE IMMEDIATE ('ALTER SYSTEM KILL SESSION ''' || ln_cur.sid || ',' || ln_cur.serial# || ''' IMMEDIATE');
   END LOOP;
END;
/

Solution 4:

Make sure that you alter the system and enable restricted session before you kill them or they will quickly log back into the database before you get your work completed.