获取执行计划，
第一种方式,set autotrace on
第二种方式,explain plan for

第三种方式,dbms_xplan.DISPLAY_CURSOR

alter session set STATISTICS_LEVEL = ALL;--不设置无法获得A-ROWS等信息

select sysdate from dual;--运行SQL

select * from table(dbms_xplan.DISPLAY_CURSOR(null, null, 'ALLSTATS'));

--如果SQL_ID输入NULL 则默认为之前运行的一条SQL

ALTER SESSION SET STATISTICS_LEVEL=TYPICAL;

如果通过AWR已经获取了SQL_ID，则可以直接得到执行计划

select * from table(dbms_xplan.display_awr('sql_id'));

select * from table(dbms_xplan.display_cursor('sql_id',null,'ADVANCED ALLSTATS LAST PEEKED_BINDS'));

获取SQL的一个绑定变量

SELECT t.VALUE_STRING, t.VALUE_ANYDATA

FROM v$sql_bind_capture t

WHERE sql_id = 'c1j018vt5ajdu';

SELECT snap_id, NAME, position, value_string, last_captured

, WAS_CAPTURED

FROM dba_hist_sqlbind

WHERE sql_id = 'c1j018vt5ajdu';

SELECT

dbms_sqltune.extract_bind(bind_data, 1).value_string AS a,

dbms_sqltune.extract_bind(bind_data, 2).value_string AS b

FROM wrh$_sqlstat

WHERE sql_id = 'c1j018vt5ajdu';

参考: http://hi.baidu.com/iguonan/item/ab1b134e65c7f415896d10ba

根据SQL_ID查看执行计划