This document discusses backup and restore options for MongoDB databases. It describes mongodump and mongorestore tools that can backup databases to files and restore from files. It also discusses repairing databases using the repair command if issues occur from unexpected shutdowns. The most important thing is being able to restore backups.

1. Backup and Restore Database
in MongoDB
By: Prem Regmi

2. What’s the most important
thing about making backups?
RESTORING THEM

3. Backup Options
• Mongodump
• Copy files
• Snapshot disk

4. mongodump
• Dumps collections to *.bson files
• Mirrors your structure
• Can be run in live or offline mode-

5. mongodump

6. mongodump
• Type mongodump in your terminal
• mongodump --db hero(hero is the database
name)
• Database save inside dump folder

7. mongodump

8. mongorestore
• mongorestore
• Restore all database inside dump

9. Repair
• Repair all databases on the server:
• $ mongod –repair
• Repair Database command to repair a single
• database:
> use project_development
> db.runCommand({repairDatabase: 1})
• which operate on a single collection :
rebuild indexes
>use tuotorial_development
> db.employee_qualifications.reIndex()
compact the collection
> db.runCommand({ compact: "employee_qualifications" }

10. Recover MongoDB
• Unexpected Shutdown
• Error: couldn't connect to server 127.0.0.1
shell/mongo.js:84

11. Solution
• Remove the mongod.lock file
• Run the --repair process