Monitoring All Queries

Question

I am looking for a solution to monitoring all SQL queries executed on a database in real time. Something akin to what would be an "SQL tail" capability. This would be for any user executing queries on any table.
Does something like this already exist in Oracle 10g or would a custom solution need to be built?
Thanks.

Answer 1

ASH data is sampled every second, so it is close to real-time.
Look at v$active_session_history for ASH data.
So, for example, to look at the top 30 SQL statements over the past 5 minutes, you can run:
SELECT topsql.sql_id ,txt.sql_text
      ,topsql.active_hits ,topsql.pctload*100 pctload
FROM (SELECT sql_id ,COUNT(*) active_hits
            ,ROUND(COUNT(*)/SUM(COUNT(*)) OVER (), 2) pctload
      FROM v$active_session_history
      WHERE session_type <> 'BACKGROUND'
      AND   sample_time > sysdate -5/1440
      GROUP BY sql_id
      ORDER BY COUNT(*) DESC
     ) topsql
    ,v$sqltext txt
WHERE topsql.sql_id = txt.sql_id
AND   txt.piece = 0
AND   ROWNUM <= 30
;