使用remove_constants工具查看Oracle是否使用绑定变量

这个也是Tom大神写的工具。
https://asktom.oracle.com/pls/asktom/f?p=100:11:::::P11_QUESTION_ID:1163635055580

下面模拟没有绑定变量的环境,然后使用该工具查看
创建实验帐号
conn / as sysdba
create user edmond identified by edmond;
grant connect,resource,dba to edmond;

create table t(x int);
insert into t select rownum from dual connect by level<=10000;

create or replace procedure p1
as
    l_cnt number;
begin
    for i in 1 .. 10000
    loop
        execute immediate 'select count(*) from t where x=' || i into l_cnt;
    end loop;
end;
/

在一个终端执行p1过程,开启另一个终端执行如下脚本:
  1. create table t1as select sql_textfrom v$sqlarea;

  2. alter table t1add sql_text_wo_constantsvarchar2(1000);

  3. create or replace function
  4. remove_constants( p_queryin varchar2 ) return varchar2
  5. as
  6.     l_querylong;
  7.     l_charvarchar2(1);
  8.     l_in_quotes booleandefault FALSE;
  9. begin
  10.     for iin 1.. length( p_query)
  11.     loop
  12.         l_char:= substr(p_query,i,1);
  13.         if ( l_char= '''' and l_in_quotes)
  14.         then
  15.             l_in_quotes:= FALSE;
  16.         elsif( l_char= '''' and NOT l_in_quotes)
  17.         then
  18.             l_in_quotes:= TRUE;
  19.             l_query:= l_query|| '''#';
  20.         end if;
  21.         if ( NOT l_in_quotes) then
  22.             l_query:= l_query|| l_char;
  23.         end if;
  24.     end loop;
  25.     l_query:= translate( l_query, '0123456789', '@@@@@@@@@@' );
  26.     for iin 0.. 8 loop
  27.         l_query:= replace( l_query, lpad('@',10-i,'@'), '@' );
  28.         l_query:= replace( l_query, lpad(' ',10-i,' '), ' ' );
  29.     end loop;
  30.     return upper(l_query);
  31. end;
  32. /
  33. update t1set sql_text_wo_constants= remove_constants(sql_text);

set linesize 200;
col sql_text_wo_constants format a100;
  1. select sql_text_wo_constants, count(*)
  2.   from t1
  3.  group by sql_text_wo_constants
  4. having count(*) > 100
  5.  order by 2
  6. /

可以看到结果如下,已经找到了没有绑定变量的语句。
使用remove_constants工具查看Oracle是否使用绑定变量




标题名称:使用remove_constants工具查看Oracle是否使用绑定变量
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