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ALTER SYSTEM DISCONNECT SESSION 'sid,serial#' POST_TRANSACTION;
ALTER SYSTEM DISCONNECT SESSION 'sid,serial#' IMMEDIATE;
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-- Get ORACLE Session IDs (SID and SERIAL#)
SELECT SID, SERIAL#, STATUS, SERVER FROM V$SESSION WHERE USERNAME = '<username>';
-- Kill session (and wait for rollback if any )
ALTER SYSTEM KILL SESSION 'SID,SERIAL#' IMMEDIATE;