How do I copy a database in MongoDB to another database?
How we copy MongoDB database files
- Stop MongoDB on the source server. It’s always a good idea to shut down any connections to mongod service before starting database backup.
- Create a MongoDB database backup.
- Copy MongoDB database files to the destination server.
- Restore MongoDB database.
- Access to users on the new server.
Can you link collections in MongoDB?
In general, using a link collection and doing joins to access data (relational data model) is possible in MongoDB. However it just uses different approach to model data. Representing data in BSON documents (Binary JSON) with sub-documents and arrays in many cases makes linking collections and joins redundant.
Can you copy MongoDB files?
Yes, the data directory can be directly copied; however, you also need to make sure that the mongodb user has complete access to the directory after you copy it.
How do I merge two MongoDB collections?
Specify either:
- The collection name as a string to output to a collection in the same database where the aggregation is run. For example: into: “myOutput”
- The database and collection name in a document to output to a collection in the specified database. For example: into: { db:”myDB”, coll:”myOutput” }
How can I share my MongoDB database?
3 Answers. Yes, you can upload the /data directory, that is one way to backup the database. You can also use mongodump with –gzip or mongoexport as your pointed out yourself. If you wish to do the backup regularly then you can cp/rsync the /data directory on regular basis.
How to copy a collection from MongoDB to another database?
Right-click on collection1 collection in DB Explorer and select Copy ‘collection1’ Collection to another Database… item in the popup menu. Specify destination database, additional parameters and click Execute.
How big is the replica set of MongoDB?
The replica set consists of three MongoDB 4.2 members. Test collection collection1 contains 1 million documents with size about 500Mb. The results of our comparison you can find here. + Usability: 4. – Can only be run against MongoDB 4.0 or earlier versions. – Can clone collection to the same database only.
Do you need to save the dump to mongorestore?
There is no need to save the dump to your local disk, you can pipe the dump directly into mongorestore: In case you run a shared cluster, the new collection is not sharded by default. All data is written initially to your primary shard. This may cause problems with disk space and put additional load to your cluster for balancing.
How to copy a collection from one database to another?
This might be just a special case, but for a collection of 100k documents with two random string fields (length is 15-20 chars), using a dumb mapreduce is almost twice as fast as find-insert/copyTo: Using pymongo, you need to have both databases on same mongod, I did the following: