SYS@moe65 SQL>delete from scott.emp;14 rows deleted.SYS@moe65 SQL>SELECT s.sid, s.serial#, 2 CASE BITAND(t.flag, POWER(2, 28)) 3 WHEN 0 THEN 'READ COMMITTED' 4 ELSE 'SERIALIZABLE' 5 END AS isolation_level 6 FROM v$transaction t 7 JOIN v$session s ON t.addr = s.taddr AND s.sid = sys_context('USERENV', 'SID'); SID SERIAL# ISOLATION_LEVE---------- ---------- -------------- 149 61 READ COMMITTEDSYS@moe65 SQL>rollback;Rollback complete.SYS@moe65 SQL>exit