20条记录一页,扫描第2页就需要访问40条记录。
SQL> select * from ( select * from ( select /*+ index_desc(a idx_page_3) */ a.*,rownum rn from pageSQL> select * from ( se
20条记录一页,扫描第2页就需要访问40条记录。
SQL> select * from ( select * from ( select /*+ index_desc(a idx_page_3) */ a.*,rownum rn from pageSQL> select * from ( se