作者：惜分飞

惜分飞 — Wed, 13 Jun 2012 17:28:01 +0000

asktom中给出一个查询OPTIMIZER_INDEX_COST_ADJ 方法

SQL> select round((select average_wait
  2                  from v$system_event
  3                 where event='db file sequential read')/
  4               (select average_wait
  5                  from v$system_event
  6                 where event='db file scattered read')
  7              * 100) OPTIMIZER_INDEX_COST_ADJ 
  8    from dual;

OPTIMIZER_INDEX_COST_ADJ
------------------------
                      70


select round((select average_wait
                from v$system_event
               where event='db file sequential read')/
             (select average_wait
                from v$system_event
               where event='db file scattered read')
            * 100) OPTIMIZER_INDEX_COST_ADJ 
  from dual;

《OPTIMIZER_INDEX_CACHING和OPTIMIZER_INDEX_COST_ADJ参数说明》的评论

作者：惜分飞