fix: improve mysql query performance in instructor dashboard#208
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naincy128 merged 1 commit intorelease-ulmofrom Apr 10, 2026
Merged
fix: improve mysql query performance in instructor dashboard#208naincy128 merged 1 commit intorelease-ulmofrom
naincy128 merged 1 commit intorelease-ulmofrom
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Pull request overview
Improves instructor dashboard responsiveness by optimizing the CourseEnrollmentManager.is_small_course enrollment-threshold query that can trigger slow MySQL execution (and eventual 504s) due to default model ordering.
Changes:
- Clears default
CourseEnrollmentordering for theis_small_coursequery to avoid expensiveORDER BYwork. - Replaces a sliced
.count()with fetching a limited set of IDs and usinglen(...)to decide “small course”.
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Description
There is an issue as described in Jira ticket where the instructor page for a course shows 504, but the django request works well.
Datadog shows that django request works :- (Datadog link reference )
The most likely cause of this is because a MySQL query is taking long to respond. This PR tries to fix it.
Relevant slack thread :- https://twou.slack.com/archives/C04ACDVM6A1/p1773409936850749
Jira ticket