Context
mongorestore loads data created by mongodump, but a successful connection to the target does not establish that the restore plan is correct. Tool versions, server compatibility, namespace choices, and replay options all affect the outcome. Start with an isolated target and an explicit definition of which dump and recovery point you intend to recover.
Prerequisites
Record source server version and feature compatibility version, destination version, Database Tools versions, dump format, capture options, and artifact checksums. Obtain the corresponding tool binaries and a protected test environment. Prevent restored applications, scheduled jobs, and integrations from reaching production systems. Keep the original dump immutable during testing and store restore logs without exposing credentials.
Prepare the restore boundary
- Review compatibility using the current Database Tools documentation. Prefer matching the documented source and destination versions or feature compatibility versions, and use the same tool version for dump and restore. Do not treat restoring into a newer server as a substitute for a supported upgrade procedure. Metadata, archive, and replay compatibility can have stricter consequences than plain BSON insertion.
- Decide whether this is a selected-namespace restore or a full replica-set dump with oplog replay. These are different workflows.
--oplogReplayhas documented restrictions that prevent combining it with several namespace filters and remapping options, and it is not a sharded-cluster recovery mechanism. Review the exact supported capture-and-restore pair rather than adding options until the command starts. - Confirm destination identity and emptiness through an approved preflight check.
mongorestoreinserts documents; it does not update existing documents with matching identifiers. Restoring into a populated collection can therefore produce duplicate-key failures and a mixed result. Avoid destructive overwrite options in an exploratory run. Use a fresh isolated target for a clean acceptance test. - Run the reviewed command against that target and retain complete status output. Check document failures as well as the process exit result, then inspect indexes, collection options, users where relevant, and representative application records. If using replay, verify the supported replay range and capture conditions. Do not change feature compatibility while creating a dump whose replay depends on that stable format.
Diagnostic table
| Finding | Likely issue | Next action |
|---|---|---|
| Duplicate-key errors | Existing destination identifiers | Reassess target and restore scope |
| Replay rejects namespace option | Incompatible workflow choices | Use documented full replay procedure |
| Metadata restore behaves unexpectedly | Version or format mismatch | Check capture and restore versions |
| Records restore, indexes fail | Incomplete usable database | Inspect index errors before acceptance |
Illustrative scenario
A team tests a customer-data dump in an old staging database. Matching identifiers are rejected, leaving old and restored documents together. The team preserves the logs, creates a fresh isolated destination, and repeats the supported restore with matching tools. The second run is assessed against known record samples and index definitions. The failure was a destination-scope error, not evidence that the source dump was empty.
Correct and verify
Fix compatibility or scope before rerunning. Never conceal document failures by reporting only a restored-document count. Compare expected namespaces, representative totals, key relationships, indexes, and business workflows. A data restore can complete while the application still lacks a required role or collection option. Keep those checks in the acceptance record.
Operating procedure
Store capture versions and options with every retained dump. Rehearse selected-data restores separately from full replay recovery. Track artifact verification, restore failures, and elapsed recovery phases using measured local results. Review the procedure when upgrading MongoDB or Database Tools so a future emergency uses an already tested compatibility path.
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