Oracle查询数据库隔离级别

declare
trans_id Varchar2(100);
begin
trans_id := dbms_transaction.local_transaction_id( TRUE );
end;

SELECT s.sid, s.serial#,
　　CASE BITAND(t.flag, POWER(2, 28))
　　　　WHEN 0 THEN 'READ COMMITTED'
　　　　ELSE 'SERIALIZABLE'
　　END AS isolation_level
FROM v$transaction t
JOIN v$session s ON t.addr = s.taddr AND s.sid = sys_context('USERENV', 'SID');