database
MongoDB Errors
MongoDB errors: 11000 (duplicate key), 50 (operation timeout), 89 (network timeout), 13 (auth failure), 121 (document validation), 133 (FailedToSatisfyReadPreference), 134 (ReadConcernMajorityNotAvailableYet).
MongoDB error codes are numeric. `11000` (E11000) duplicate key is the most common write error. Replica set primary failover surfaces as 'not master' errors briefly — retry with retryWrites=true. Transaction abort (251) needs explicit retry logic. Connection failures often trace to SRV record DNS issues with Atlas connection strings.
Official docs
https://www.mongodb.com/docs/manual/reference/error-codes/
Status page
https://status.mongodb.com/
Support
https://www.mongodb.com/community