How to obtain SQL that don't use bind variables

Question

Hi,
I'm trying to identify the SQL that should benefit from using bind variables.
First, I tried to obtain the common signature from all those sql calls, by using:
select * from (
select  force_matching_signature, count(1) from v$sql where force_matching_signature<>0 group by force_matching_signature order by 2 desc
) where rownum < 50;Then, I copied those values to clipboard and executed: select sql_text from v$sql where force_matching_signature=<<<copied_signature_value>>>;Now I want to make it automatically, and get just 1 occurrence of each SQL that is similar to others by using a query.
I've tried this:
select sql_text from
select sql_text, force_matching_signature, row_number() over (partition by force_matching_signature order by sql_text desc)rn from v$sql where force_matching_signature <>0
)where rn <2 and rownum < 10 order by force_matching_signature descBut this is not returning results by attending to the count(1) of the first query I used. How can I modify this so I get the results in order of 'importance'?
Thanks

Answer 1

And I said. First use order by, then use rownum. I didn't mention row_number. Also there should be no need to add any more columns.
Did you try it? Why didn't it work?
untested example
select * from (
   select sql_text from (select sql_text, force_matching_signature, row_number() over (partition by force_matching_signature order by sql_text desc) rn from v$sql where force_matching_signature != 0)
   where rn = 1
   order by force_matching_signature desc /* add any ordering you like here */
where rownum < 10  /* then filter on the first 10 results */If you want to order it in such a way that the statement that is found most times comes first then say so. However I do not see how to group in your case.
maybe like this
tested example
select * from (
   select cnt, sql_text
   from (select sql_text, force_matching_signature, row_number() over (partition by force_matching_signature order by sql_text desc) rn , count(*) over (partition by force_matching_signature) cnt
         from v$sql
         where force_matching_signature != 0)
   where rn = 1
   order by cnt desc, force_matching_signature desc /* add any ordering you like here */
where rownum < 10  /* then filter on the first 10 results */
;Edited by: Sven W. on Oct 11, 2012 2:49 PM
Edited by: Sven W. on Oct 11, 2012 2:51 PM
Edited by: Sven W. on Oct 11, 2012 2:56 PM -- added count column to the output