1.创建大纲 create or replace outline outln_t1 for category category_t1 on select * from t1 where id=1; alter system set use_stored_outlines=category_t1; --激活一个类目的存储大纲 --select sql_id,hash_value,child_number from v$sql where sql_text like 'select * from t1 where id=1;%'; --exec dbms_outln.create_outline(sql_id,'DEFAULT'); --通过过程创建 select category,ol_name,hintcount hints,sql_text from outln.ol$;
2.将现有OUTLINE复制到新建的私有的OUTLINE中去--1.当前会话下修改不影响其它会话,2.已存在outline需要修改时 create private outline prv_ol_t1 from outln_t1; create private outline prv_ol_temp on select /*+ full(t1) */ * from t1 where id=1;--用提示生成一个全表扫描计划
3.修改大纲(可以使用dbms_outln_edit包中所提供的过程进行修改或直接修改ol$hints) SQL> select category,ol_name,hintcount hints,sql_text from outln.ol$;--公有大纲的提示数量 SQL> select ol_name,hint_text from outln.ol$hints; --公有大纲的提示内容 SQL> select category,ol_name,hintcount hints,sql_text from ol$; --私有大纲的提示数量 SQL> select ol_name,hint_text from ol$hints; --私有大纲的提示内容 OL_NAME HINT_TEXT ------------------------------ ------------------------- PRV_OL_T1 OUTLINE_LEAF(@"SEL$1") PRV_OL_T1 IGNORE_OPTIM_EMBEDDED_HINTS PRV_OL_T1 OPTIMIZER_FEATURES_ENABLE('11.2.0.3') PRV_OL_T1 DB_VERSION('11.2.0.3') PRV_OL_T1 ALL_ROWS PRV_OL_T1 INDEX_RS_ASC(@"SEL$1""T1"@"SEL$1" ("T1"."ID")) PRV_OL_TEMP FULL(@"SEL$1""T1"@"SEL$1") PRV_OL_TEMP OUTLINE_LEAF(@"SEL$1") PRV_OL_TEMP ALL_ROWS PRV_OL_TEMP DB_VERSION('11.2.0.3') PRV_OL_TEMP OPTIMIZER_FEATURES_ENABLE('11.2.0.3') PRV_OL_TEMP IGNORE_OPTIM_EMBEDDED_HINTS --直接修改ol$hints(私有大纲的提示内容) UPDATE ol$hints SET ol_name=DECODE(OL_NAME,'PRV_OL_T1','PRV_OL_TEMP','PRV_OL_TEMP','PRV_OL_T1') WHERE ol_name IN ('PRV_OL_T1','PRV_OL_TEMP'); --直接修改ol$hints(私有大纲的提示数量) UPDATE ol$ ol1 SET hintcount=(SELECT hintcount FROM ol$ ol2 WHERE ol2.ol_name IN ('PRV_OL_T1','PRV_OL_TEMP') AND ol2.ol_name != ol1.ol_name) WHERE ol1.ol_name IN ('PRV_OL_T1','PRV_OL_TEMP');
4.在修改之后必须使用refresh_private_outline过程对上述私有outline进行刷新 EXEC DBMS_OUTLN_EDIT.REFRESH_PRIVATE_OUTLINE ('PRV_OL_T1');
5.为了对创建的私有OUTLINE进行检查而需要将参数use_private_outlines设置为true alter session set use_private_outlines=true;
6.在充分的检查结束后,能过执行下面的操作来达到共享使用的目的 create or replace outline outln_t1 from private PRV_OL_T1;
7.在共享使用转换结束后,通过将参数use_private_outlines设置为false来结束修改之前的私有outline的执行 alter session set use_private_outlines=false;
8.OUTLINE的观察:dba_outlines、dba_outline_hints selecthint from dba_outline_hints where name='OUTLN_T1';
**********本博客所有内容均为原创,如有转载请注明作者和出处!!!********** Name: guoyJoe QQ: 252803295 Email: oracledba_cn@hotmail.com Blog: http://blog.csdn.net/guoyJoe ITPUB: http://www.itpub.net/space-uid-28460966.html OCM: http://education.oracle.com/education/otn/YGuo.HTM _____________________________________________________________ 加群验证问题:哪些SGA结构是必需的,哪些是可选的?否则拒绝申请!!! 答案在:http://blog.csdn.net/guoyjoe/article/details/8624392 Oracle@Paradise 总群:127149411 Oracle@Paradise No.1群:177089463(已满) Oracle@Paradise No.2群:121341761 Oracle@Paradise No.3群:140856036
|