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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 COMMITTED
SYS@moe65 SQL>rollback;
Rollback complete.
SYS@moe65 SQL>exit