They don’t copy any of the physical files relating to the data (like control files, log files, executables, etc.). Index creation happens after the data is restored. The Mongorestore command is used to restore the dump files created by Mongodump. The Mongodump command dumps a backup of the database into the “.bson” format, and this can be restored by providing the logical statements found in the dump file to the databases. MongoDB supplies two utilities to manage logical backups: Mongodump and Mongorestore. If you have enabled field level encryption, backing up data will ensure that the field remains encrypted. The data is encrypted, serialized, and written as either a “.bson,” “.json,” or “.csv” file, depending on the backup utility used. During the logical backup process, client APIs are used to get the data from the server. Logical backups dump data from databases into backup files, formatted as a BSON file. There are two types of backups in MongoDB: logical backups and physical backups. A standalone connection string will fail if the MongoDB host proves unavailable. Use a replica set connection string when using unsupervised scripts. Backups can take a long time, especially if the data sets are quite large. Time the backup of data sets around periods of low bandwidth/traffic. Use secondary servers for backups as this helps avoid degrading the performance of the primary node. Fallback snapshots are created using a different process, and they may have inconsistent data. While you can use a fallback snapshot to restore a cluster, it should only be done when absolutely necessary. If a snapshot fails, Atlas will automatically attempt to create another snapshot. While you can also enable cloud backups when modifying an existing cluster, you should turn this feature on by default, as it will prevent data loss. When creating a new cluster, you have the option to turn on cloud backup. Similarly, a structure for a collection will be created whenever the first document is inserted into the database. You don’t need to explicitly create a MongoDB database, as it will be automatically created when you specify a database to import from. While JSON is easy to work with, it doesn’t support all of the data types that BSON supports, and it may lead to the loss of fidelity. It’s better to use BSON when backing up and restoring. MongoDB uses both regular JSON and Binary JSON (BSON) file formats. There are some best practices you should follow when using the MongoDB backup and restore services for your MongoDB clusters. MongoDB Backup and Restore Best Practices The cloud backup and cloud restore functions remain the preferred method of managing backups. The MongoDB Atlas backup feature incrementally backs up the data in a specified cluster, and you can restore from these snapshots or from any point in time within the past 24 hours. Legacy backups are supported but deprecated. The target cluster must also be using either the same version of MongoDB or a newer version than the snapshot cluster. The restore function in MongoDB Atlas lets the user restore to either a replica set or a sharded cluster, as long as the destination uses the same encryption provider as the snapshot cluster of origin. MongoDB Atlas supports cloud backups for clusters served on the following hosting platforms: MongoDB Cloud Backups are created using the native snapshot functionality of the cluster’s cloud service provider. MongoDB Atlas allows the user to create backups using the cloud backup system.
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