MongoDB Profiler Slow Queries
MongoDB database profiler captures slow queries when threshold is exceeded.
Category archive
MongoDB fixes
Published troubleshooting guides for mongodb issues.
MongoDB Driver Explain Incorrect
MongoDB explain plans show wrong index when statistics are stale.
MongoDB Driver TxnNumber Not Found
MongoDB retryable writes fail when transaction number is stale.
MongoDB Driver ServerSelection Timeout
MongoDB driver cannot select server when replica set is misconfigured.
MongoDB Driver Pool Exhausted
MongoDB driver connection pool is exhausted when maxPoolSize is too small.
MongoDB Driver BulkWrite Conflict
MongoDB bulkWrite operations fail when ordered writes encounter duplicate key.
MongoDB Compass Connection Timeout
MongoDB Compass cannot connect when connection string is invalid.
MongoDB Export Large Collection
MongoDB mongodump fails on large collections when disk space is insufficient.
MongoDB Restore Wrong Namespace
MongoDB restore imports data to wrong database when nsFrom/nsTo is wrong.
MongoDB Point-in-Time Recovery Unavailable
MongoDB PITR fails when oplog backup gaps exist.
MongoDB Session Table Full
MongoDB cannot create new sessions when session table is exhausted.
MongoDB Majority Write Unavailable
MongoDB cannot satisfy writeConcern majority when nodes are down.
MongoDB Resync Required
MongoDB secondary requires full resync when oplog is insufficient.
MongoDB Initial Sync Failed
MongoDB new secondary initial sync fails when source is overloaded.
MongoDB Rolling Restart Stuck
MongoDB rolling restart cannot complete when primary election is stuck.
MongoDB FCV Upgrade Blocked
MongoDB featureCompatibilityVersion cannot upgrade when secondary is down.
MongoDB SNI Server Name Mismatch
MongoDB SNI routing fails when server name does not match certificate.
MongoDB OCSP Certificate Revoked
MongoDB TLS connections fail when certificate is revoked via OCSP.
MongoDB Kerberos Auth Failed
MongoDB GSSAPI authentication fails when keytab is expired.
MongoDB LDAP Authentication Timeout
MongoDB LDAP auth times out when directory server is unreachable.
MongoDB Audit Log Disk Full
MongoDB audit logging stops when destination disk is full.
MongoDB Encryption at Rest Key Expired
MongoDB KMIP master key expiration prevents data decryption.
MongoDB Atlas Authentication Failed
MongoDB Atlas auth fails when database user credentials are wrong.
MongoDB Atlas Network Access IP
MongoDB Atlas connections fail when IP whitelist does not include client.
MongoDB Mongos Routing Stale
MongoDB mongos has stale metadata when config server refresh fails.
MongoDB Jumbo Chunk Cannot Split
MongoDB chunks are too large to split when shard key distribution is skewed.
MongoDB Shard Key Cardinality Low
MongoDB sharding is ineffective when shard key has low cardinality.
MongoDB Max Key Range Exhausted
MongoDB sharded cluster cannot route when key pattern is exhausted.
MongoDB Namespace Name Too Long
MongoDB collection names exceed 120 character namespace limit.
MongoDB BSON Document Size Limit
MongoDB rejects documents larger than 16MB BSON size limit.
MongoDB Schema Validation Failed
MongoDB insert operations fail when documents do not pass validation rules.
MongoDB Text Search Not Working
MongoDB text search returns no results when text index is not built.
MongoDB Geospatial Query Slow
MongoDB geospatial queries are slow when 2dsphere index is missing.
MongoDB TTL Index Not Deleting
MongoDB TTL index does not delete documents when foreground deletion is blocked.
MongoDB Change Stream Closed
MongoDB change stream closes when resume token is invalidated.
MongoDB GridFS Chunk Missing
MongoDB GridFS file is incomplete when chunks collection is corrupted.
MongoDB Aggregation Memory Limit
MongoDB aggregation stages fail when memory limit is exceeded without disk use.
MongoDB Cursor Not Found
MongoDB cursor expires when iteration takes longer than cursorTimeoutMillis.
MongoDB Transaction Aborted
MongoDB multi-document transactions abort when lock timeout is exceeded.
MongoDB Read Concern Unavailable
MongoDB read concern linearizable fails when primary is unavailable.
MongoDB Write Concern Timeout
MongoDB write operations timeout when writeConcern cannot be satisfied.
MongoDB Index Build Blocking
MongoDB index builds block operations when done in foreground.
MongoDB Slow Query No Index
MongoDB queries perform collection scan when appropriate index is missing.
MongoDB WiredTiger Cache Full
MongoDB WiredTiger cache eviction cannot keep pace with write throughput.
MongoDB Mongod Not Starting
MongoDB server fails to start when storage engine is corrupted or locks are stale.
MongoDB Config Server Unreachable
MongoDB mongos cannot reach config servers when replica set is down.
MongoDB Sharded Cluster Balancer Stuck
MongoDB balancer cannot move chunks when migration lock is held.
MongoDB Oplog Exhausted
MongoDB oplog is exhausted when secondary is offline longer than oplog window.
MongoDB Secondary Falling Behind
MongoDB secondary replica falls behind when oplog window is too small.
MongoDB Replica Set Primary Step Down
MongoDB primary steps down when heartbeat failures or network partitions occur.