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Configuration change removed ENABLE_CACHE=true, forcing all requests through expensive database queries.
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prod-mongodb-us-east-1prod-mongodb-us-east-1userprofilesusersCOLLSCAN operations: 50-54ms, $collStats operations: 41-52msuserprofiles.users collection. COLLSCAN operations examining 918 documents to return 1 result, causing 50-54ms query latency. accountType and registrationDate fields lack proper indexing. Secondary factor: administrative $collStats operations taking 41-52ms.Visual map from root cause through intermediate effects to final impacts with confidence scores.
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Prioritized fixes from missing indexes to query optimizations with severity levels and investigation paths.
MongoDB Atlas cluster prod-mongodb-us-east-1 shows 5 slow queries (>100ms) in last hour. Key findings: COLLSCAN operations on userprofiles.users (50-54ms), aggregate $collStats operations (41-52ms). Performance impact moderate with table scans affecting query efficiency.
userprofiles.usersslow queries • prod-mongodb-us-east-1
Impact
Inefficient table scans examining 918 documents to return 1 result. Poor query selectivity causing unnecessary resource consumption.
Most Likely Cause
accountType and registrationDate fields$collStats Operationsslow queries • prod-mongodb-us-east-1
Impact
Monitoring operations taking 41-52ms. Normal administrative overhead but contributing to slow query count.
Most Likely Cause
INVESTIGATE (3 OF 4)
userprofiles.users collection for {accountType: 1, registrationDate: 1, status: 1}userprofiles.users to optimize filter selectivityMONITOR
$collStats operations frequency if they become more frequentAuto-generated postmortem with root cause, impact summary, and timeline that becomes searchable knowledge.
Missing indexes on accountType and registrationDate fields in userprofiles.users collection, forcing COLLSCAN operations examining 918 documents to return 1 result.
Query latency increased to 50-54ms for table scans, causing poor query selectivity and unnecessary resource consumption across user-profile-service.
MongoDB Atlas slow query detected: COLLSCAN on userprofiles.users taking 50-54ms
Alert: MongoDB Atlas Slow Queries - 5 queries exceeding 100ms threshold
Detected pattern: 918 documents examined to return 1 result, indicating poor query selectivity
Administrative $collStats operations contributing 41-52ms to slow query count
Root cause identified: Missing indexes on accountType and registrationDate fields causing full table scans