Dear colleagues,
I'm facing a problem probably related to caching infrastructure in DJango.
Documentation says that data are fetched from DB once a then readed from
cache.
However, my results are different. Query is executed two times. On my
opinion the first fetch should be enough.
Here is a record from my debug log:
[06/Sep/2013 08:35:11] "GET /mvpn/waves/OSCAR_MVPN/ HTTP/1.1" 200 2316
DEBUG (11.092) select /*+ first_rows */rownum id, t.* from
ngin_mvpn_wave_cdr_sum t where t.wave_id=:arg0 order by vpn_name;
args=[u'OSCAR_MVPN'] 11.092076 select /*+ first_rows */rownum id, t.*
from ngin_mvpn_wave_cdr_sum t where t.wave_id=:arg0 order by vpn_name
[u'OSCAR_MVPN']
DEBUG (10.353) select /*+ first_rows */rownum id, t.* from
ngin_mvpn_wave_cdr_sum t where t.wave_id=:arg0 order by vpn_name;
args=[u'OSCAR_MVPN'] 10.352256 select /*+ first_rows */rownum id, t.*
from ngin_mvpn_wave_cdr_sum t where t.wave_id=:arg0 order by vpn_name
[u'OSCAR_MVPN']
[06/Sep/2013 08:35:35] "GET /mvpn/waves/OSCAR_MVPN/cdr/ HTTP/1.1" 200 19515
The problem is, that one execution takes 11 seconds what is acceptable
result for business. However 20s is not. Query was already optimized - huge
number of records from several tables is processed.
What I'm doing on view level:
...
mvpn_cdr = MVPN_WAVE_CDR_SUM.objects.raw('select /*+ first_rows */rownum
id, t.* from ngin_mvpn_wave_cdr_sum t where t.wave_id=%s order by
vpn_name', [wave_id])
...
for i in mvpn_cdr:
count_moc_onnet = count_moc_onnet + i.count_moc_onnet
...
return render_to_response('ngin/mvpn_wave_cdr_sum.html', {'resultset':
mvpn_cdr}, context_instance=c)
So, I think that "filter" method should fetch data from DB and put it into
QuerySet cache. Further use of data should be taken from a cache.
Yes, It's fact that I was not setting any cache configuration before.
Please help or explain what I'm doing wrong.
Radim.
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