[Building Sakai] Heavy Samigo query
Kusnetz, Jeremy
JKusnetz at APUS.EDU
Wed Oct 12 06:15:12 PDT 2011
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>
This message is private and confidential. If you have received it in
error, please notify the sender and remove it from your system.
This message is private and confidential. If you have received it in error, please notify the sender and remove it from your system.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://collab.sakaiproject.org/pipermail/sakai-dev/attachments/20111012/ef215851/attachment.html
More information about the sakai-dev
mailing list