查看oracle 真实执行计划

一共3个step；

step1:在sql执行时，增加hint：  /*+gather_plan_statistics*/ 

step2：查出sql的sql id:  select * from v$sql s where s.SQL_TEXT like 'SELECT /*+monitor*/TT.*%'

step3:执行下面sql查看真实执行计划；

SELECT

 sp.last_starts AS "starts",
 
 sp.last_output_rows AS "rows",
 
 round(sp.last_elapsed_time / 1000000, 2) AS TIME,
 
 sp.last_cr_buffer_gets bf,
 
 sp.depth d,
 
 rtrim(lpad(' ', 2 * (depth - 1)) || operation ||
       decode(options, NULL, '', ' ' || options)) "Explain plan",
 
 decode(id,
        0,
        '------------- ',
        substr(decode(substr(object_name, 1, 7),
                      'SYS_LE_',
                      NULL,
                     
                      object_name) || ' ',
               1,
               30)) AS "object",