为什么一条update语句产生两个serial# sid相同

mahan

环境：RAC

创建测试数据
conn itpux/itpux
create table test10 as select * from dba_objects;

update 表，不进行提交
SQL> update test10 set object_id=801 where object_id=800;

2 rows updated.

查看sid和锁

    sess.serial#,
    lo.oracle_username,
    lo.os_user_name,
    ao.object_name,
    lo.locked_mode
    from gv$locked_object lo,
    dba_objects ao,
    gv$session sess
where ao.object_id = lo.object_id and lo.session_id = sess.sid and ao.object_name='TEST10';

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