获取Oracle SQL语句中绑定变量值的方法
在诊断SQL的性能问题时,我们有时候需要获取其绑定变量的实际值,然后将此实际值带入到SQL语句当中,用原来的SQL构成select语句(
在诊断SQL的性能问题时,我们有时候需要获取其绑定变量的实际值,然后将此实际值带入到SQL语句当中,用原来的SQL构成select语句(带where条件),,实际的执行一下,看一下选择性如何。
本文就是说获取其绑定变量值的方法。本文的编写得到枯荣长老的帮助,在此表示感谢。
本文适用于与Oracle 10G或者更高版本的db。
alter session set nls_date_format = 'yyyy-mm-dd,hh24:mi:ss';
set linesize 400
col sql_Id format a20
col name format a20
col datatype_string format a14
col value_string format a20
--这个sql从内存中读取绑定变量值信息,若是不在内存中,则使用下一个sql
select sql_id,name, datatype_string, last_captured,value_string from v$sql_bind_capture where sql_id='dxfcacn4t4ppw' order by LAST_CAPTURED,POSITION;
--这个sql从awr中读取绑定变量值信息
select instance_number, sql_id,name, datatype_string, last_captured,value_string from dba_hist_sqlbind where sql_id='fahv8x6ngrb50'order by LAST_CAPTURED,POSITION;
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