使用remove_constants工具檢視Oracle是否使用繫結變數

壹頁書發表於2014-09-19
REMOracle變數
這個也是Tom大神寫的工具。
https://asktom.oracle.com/pls/asktom/f?p=100:11:::::P11_QUESTION_ID:1163635055580

下面模擬沒有繫結變數的環境,然後使用該工具檢視
建立實驗帳號
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;
/

在一個終端執行p1過程,開啟另一個終端執行如下指令碼:
  1. create table t1 as select sql_text from v$sqlarea;

  3. alter table t1 add sql_text_wo_constants varchar2(1000);

  5. create or replace function
  6. remove_constants( p_query in varchar2 ) return varchar2
  7. as
  8.     l_query long;
  9.     l_char varchar2(1);
  10.     l_in_quotes boolean default FALSE;
  11. begin
  12.     for i in 1 .. length( p_query )
  13.     loop
  14.         l_char := substr(p_query,i,1);
  15.         if ( l_char = '''' and l_in_quotes )
  16.         then
  17.             l_in_quotes := FALSE;
  18.         elsif ( l_char = '''' and NOT l_in_quotes )
  19.         then
  20.             l_in_quotes := TRUE;
  21.             l_query := l_query || '''#';
  22.         end if;
  23.         if ( NOT l_in_quotes ) then
  24.             l_query := l_query || l_char;
  25.         end if;
  26.     end loop;
  27.     l_query := translate( l_query, '0123456789', '@@@@@@@@@@' );
  28.     for i in 0 .. 8 loop
  29.         l_query := replace( l_query, lpad('@',10-i,'@'), '@' );
  30.         l_query := replace( l_query, lpad(' ',10-i,' '), ' ' );
  31.     end loop;
  32.     return upper(l_query);
  33. end;
  34. /
  35. update t1 set 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. /

可以看到結果如下,已經找到了沒有繫結變數的語句。

來自 “ ITPUB部落格 ” ，連結：http://blog.itpub.net/29254281/viewspace-1273980/，如需轉載，請註明出處，否則將追究法律責任。

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