使用remove_constants工具查看Oracle是否使用绑定变量

发布时间：2020-08-08 20:05:18 作者：flzhang
来源：ITPUB博客阅读：216

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:

create table t1 as select sql_text from v$sqlarea;
alter table t1 add sql_text_wo_constants varchar2(1000);
create or replace function
remove_constants( p_query in varchar2 ) return varchar2
as
l_query long;
l_char varchar2(1);
l_in_quotes boolean default FALSE;
begin
for i in 1 .. length( p_query )
loop
l_char := substr(p_query,i,1);
if ( l_char = '''' and l_in_quotes )
then
l_in_quotes := FALSE;
elsif ( l_char = '''' and NOT l_in_quotes )
then
l_in_quotes := TRUE;
l_query := l_query || '''#';
end if;
if ( NOT l_in_quotes ) then
l_query := l_query || l_char;
end if;
end loop;
l_query := translate( l_query, '0123456789', '@@@@@@@@@@' );
for i in 0 .. 8 loop
l_query := replace( l_query, lpad('@',10-i,'@'), '@' );
l_query := replace( l_query, lpad(' ',10-i,' '), ' ' );
end loop;
return upper(l_query);
end;
/
update t1 set sql_text_wo_constants = remove_constants(sql_text);

set linesize 200;
col sql_text_wo_constants format a100;

select sql_text_wo_constants, count(*)
from t1
group by sql_text_wo_constants
having count(*) > 100
order by 2
/

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

使用remove_constants工具查看Oracle是否使用绑定变量

相关阅读