Script:10g中显示Active Session Count by Wait Class

摘自：

http://www.askmaclean.com/archives/script-10g-show-active-session-count-wait-class.html

SELECT TIME,
       SUM(CASE activity
             WHEN 'CPU' THEN
              1
             ELSE
              0
           END) cpu,
       SUM(CASE activity
             WHEN 'Concurrency' THEN
              1
             ELSE
              0
           END) concurrency,
       SUM(CASE activity
             WHEN 'System I/O' THEN
              1
             ELSE
              0
           END) "System I/O",
       SUM(CASE activity
             WHEN 'User I/O' THEN
              1
             ELSE
              0
           END) "User I/O",
       SUM(CASE activity
             WHEN 'Administrative' THEN
              1
             ELSE
              0
           END) "Administrative",
       SUM(CASE activity
             WHEN 'Configuration' THEN
              1
             ELSE
              0
           END) "Configuration",
       SUM(CASE activity
             WHEN 'Application' THEN
              1
             ELSE
              0
           END) "Application",
       SUM(CASE activity
             WHEN 'Network' THEN
              1
             ELSE
              0
           END) "Network",
       SUM(CASE activity
             WHEN 'Commit' THEN
              1
             ELSE
              0
           END) "Commit",
       SUM(CASE activity
             WHEN 'Scheduler' THEN
              1
             ELSE
              0
           END) "Scheduler",
       SUM(CASE activity
             WHEN 'Cluster' THEN
              1
             ELSE
              0
           END) "Cluster",
       SUM(CASE activity
             WHEN 'Queueing' THEN
              1
             ELSE
              0
           END) "Queueing",
       SUM(CASE activity
             WHEN 'Other' THEN
              1
             ELSE
              0
           END) "Other"
  FROM (SELECT trunc(sample_time, 'MI') TIME,
               nvl(wait_class, 'CPU') activity
          FROM v$active_session_history
         WHERE session_type = 'FOREGROUND')
 WHERE TIME > SYSDATE - INTERVAL '&last_min' minute
 GROUP BY TIME
 ORDER BY TIME;

10G中不能使用pivot函数，这个思路值得参考。