学无止境
发布时间:2013-12-23 15:56:52
建立反向键索引SQL> create index idx_tindex_name on tindex(object_name) reverse;Index created.SQL> exec dbms_stats.gather_table_stats(ownname=>'LDY',tabname=>'tindex',cascade=>true);PL/SQL procedure successfully completed.反向键索引,并不能让前通配符的语句走索引范围扫描,经过测试,.........【阅读全文】