Oralce的事务隔离级别

Oracle共支持3种事务隔离级别：

1. serializable

2. read committed

3. read only

Oracle默认的隔离级别是read committed。

/*查看ORACLE当前SESSION的事务隔离级别*/
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');