How to tune the below query?is taking 1min 15 sec to process 16,34,300 reco

Question

SELECT
user_id,
ispeak,
round(sum(DURATION_seconds*convert_duration(pulseunit,ratingunit))/decode(ispeak,0,max(offpeakpulse),max(peakpulse))),
round(sum(download_bytes*convert_bytes(pulseunit,ratingunit))/decode(ispeak,0,max(offpeakpulse),max(peakpulse))),
round(sum(upload_bytes*convert_bytes(pulseunit,ratingunit))/decode(ispeak,0,max(offpeakpulse),max(peakpulse))),
max(packageid),
max(peakrate),
max(offpeakrate),
max(bstplantype),
max(freevalue),
max(peakpulse),
max(offpeakpulse),
max(pulseunit),
max(ratingunit)
FROM aaa_sessions a,subscriber_rate_tab srt
where
a.user_id=srt.externalid
group by user_id,packageid,ispeak
having
trunc(min(start_time_utc)) between min(srt.activedt) and min(srt.inactivedt)
and
trunc(max(end_time_utc)) between min(srt.activedt) and min(srt.inactivedt);

Answer 1

Do you have multiprocessor CPU .
if the value is greater then 3 then you can try with parallel processing
select value from v$parameter where name ='cpu_count' ;Try this :-
ALTER SESSION ENABLE PARALLEL QUERY
SELECT /*+ parallel (a) */
user_id,
ispeak,
round(sum(DURATION_seconds*convert_duration(pulseunit,ratingunit))/decode(ispeak,0,max(offpeakpulse),max(peakpulse))),
max(ratingunit),
round(sum(download_bytes*convert_bytes(pulseunit,ratingunit))/decode(ispeak,0,max(offpeakpulse),max(peakpulse))),
max(ratingunit),
round(sum(upload_bytes*convert_bytes(pulseunit,ratingunit))/decode(ispeak,0,max(offpeakpulse),max(peakpulse))),
max(packageid),
max(peakrate),
max(offpeakrate),
max(bstplantype),
max(freevalue),
max(peakpulse),
max(offpeakpulse),
max(pulseunit),
max(ratingunit),
min(start_time_utc) ,
max(end_time_utc),
min(srt.activedt),
min(srt.inactivedt)
FROM aaa_sessions a,subscriber_rate_tab srt
where
a.user_id=srt.externalid(+)
group by user_id,packageid,ispeak
having
trunc(min(start_time_utc)) between min(srt.activedt) and min(srt.inactivedt)
and
trunc(max(end_time_utc)) between min(srt.activedt) and min(srt.inactivedt)Cheers
Nawneet
Edited by: Nawneet_Aswal on Aug 2, 2010 4:48 AM