[Building Sakai] Heavy Samigo query
Kusnetz, Jeremy
JKusnetz at APUS.EDU
Wed Oct 12 08:39:58 PDT 2011
I'm not 100%, when we are doing load testing, it's these queries that
are piling up on top of each other to the point where MySQL performance
is highly degraded.
From: ktsao at hungs.org [mailto:ktsao at hungs.org] On Behalf Of Karen Tsao
Sent: Wednesday, October 12, 2011 11:35 AM
To: Kusnetz, Jeremy
Cc: sakai-dev
Subject: Re: [Building Sakai] Heavy Samigo query
Hi Jeremy,
You are running Samigo 2.6.3? I don't have a 2.6.3 instance to explore.
It'll be easier for me if you can let me know in which steps these
queries get executed.
Thanks,
Karen
On Wed, Oct 12, 2011 at 6:15 AM, Kusnetz, Jeremy <JKusnetz at apus.edu>
wrote:
Here is another one:
EXPLAIN
select publishedf0_.ASSESSMENTID as col_0_0_,
publishedf0_.FEEDBACKDELIVERY as col_1_0_,
publishedf0_.FEEDBACKAUTHORING as col_2_0_, publishedf0_.EDITCOMPONENTS
as col_3_0_, publishedf0_.SHOWQUESTIONTEXT as col_4_0_,
publishedf0_.SHOWSTUDENTRESPONSE as col_5_0_,
publishedf0_.SHOWCORRECTRESPONSE as col_6_0_,
publishedf0_.SHOWSTUDENTSCORE as col_7_0_,
publishedf0_.SHOWSTUDENTQUESTIONSCORE as col_8_0_,
publishedf0_.SHOWQUESTIONLEVELFEEDBACK as col_9_0_,
publishedf0_.SHOWSELECTIONLEVELFEEDBACK as col_10_0_,
publishedf0_.SHOWGRADERCOMMENTS as col_11_0_,
publishedf0_.SHOWSTATISTICS as col_12_0_ from SAM_PUBLISHEDFEEDBACK_T
publishedf0_
______ Sub-Part 1 _______
Select Type: SIMPLE
Table: publishedf0_
Partitions:
Type: ALL
Poss. Keys:
Index:
Key Length:
Index Ref:
Row Count: 45745
Special:
Press e to explain, f for full query, o for optimized query
I'm worried that these queries are not even doing any kind of where's so
they are just doing full table scans.
Jeremy Kusnetz | Sr. Systems Engineer
American Public University System
American Military University | American Public University
661 S George Street, Charles Town, WV 25414
T 304-885-5333 | M 703-967-5212 | jkusnetz at apus.edu| www.apus.edu
<http://www.apus.edu>
From: sakai-dev-bounces at collab.sakaiproject.org
[mailto:sakai-dev-bounces at collab.sakaiproject.org] On Behalf Of Kusnetz,
Jeremy
Sent: Wednesday, October 12, 2011 9:13 AM
To: sakai-dev
Subject: [Building Sakai] Heavy Samigo query
One of the queries that we see piling up during high load is the
following (this is from innotop). We heavily utilize Samigo, with
thousands of active classrooms, many with a dozen or more assessments.
This is on CLE 2.6.3
EXPLAIN
select publishede0_.ASSESSMENTID as col_0_0_, publishede0_.SCORINGTYPE
as col_1_0_, publisheda1_.SUBMISSIONSALLOWED as col_2_0_ from
SAM_PUBLISHEDEVALUATION_T publishede0_, SAM_PUBLISHEDACCESSCONTROL_T
publisheda1_ where publishede0_.ASSESSMENTID=publisheda1_.ASSESSMENTID
_____________ Sub-Part 1 ______________ __________________ Sub-Part 1
__________________
Select Type: SIMPLE Select Type: SIMPLE
Table: publishede0_ Table: publisheda1_
Partitions: Partitions:
Type: ALL Type: eq_ref
Poss. Keys: PRIMARY,FK94CB245F9482C945 Poss. Keys:
PRIMARY,FK2EDF39E09482C945
Index: Index: PRIMARY
Key Length: Key Length: 8
Index Ref: Index Ref:
sakai_300.publishede0_.ASSESSMENTID
Row Count: 45874 Row Count: 1
Special: Special:
Press e to explain, f for full query, o for optimized query
Jeremy Kusnetz | Sr. Systems Engineer
American Public University System
American Military University | American Public University
661 S George Street, Charles Town, WV 25414
T 304-885-5333 | M 703-967-5212 | jkusnetz at apus.edu| www.apus.edu
<http://www.apus.edu>
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