Non-indexed queries

Question

Hello,
Is there a way to retrieve all the non indexed query's used in the database?
I use toad to monitor the database and there is a certain amount of queries non-indexed I want to find out.
TIA.
Alder

Answer 1

In TOAD the 'Database -> Spool SQL -> Spool SQL to Screen' option is often your friend.
From the spool output produced while refreshing the Database Monitor in TOAD you can see that TOAD uses the following query to derive the ratio of non-indexed to indexed SQL.
SELECT SUM (DECODE (name, 'table scans (long tables)', VALUE, 0)) /
       (SUM (DECODE (name, 'table scans (long tables)', VALUE, 0)) +
        SUM (DECODE (name, 'table scans (short tables)', VALUE, 0))) *
       100
          non_indexed_sql,
       100 -
       SUM (DECODE (name, 'table scans (long tables)', VALUE, 0)) /
       (SUM (DECODE (name, 'table scans (long tables)', VALUE, 0)) +
        SUM (DECODE (name, 'table scans (short tables)', VALUE, 0))) *
       100
          indexed_sql
FROM   v$sysstat
WHERE  1 = 1
AND    (name IN ('table scans (long tables)', 'table scans (short tables)'));As you can see this is simply the ratio of the count of 'table scans (long tables)' against 'table scans (short tables)' which are simple metrics for the database held in v$sysstat. This cannot be traced to the original statements themselves.
You could try looking at the operation/options columns in v$sql_plan or dba_hist_sql_plan views - BUT - as has already been pointed out, it is not always preferable to use indexes over other access paths to answer queries - it is heavily dependent on the data distribution and the question being asked. You would be better off looking at which queries were resource intensive.