These operations from rebuilding any remaining indexes for the Then recreate them sequentially, the error from the index key limit prevents Reindexing operations occur as part of theĪs the db.collection.reIndex() method.Because these operations drop all the indexes from a collection and
Reindexing operations will error if the index entry for an indexedįield exceeds the index key limit. Structural overhead depending on the BSON type, must be less thanĪn existing document exceeds the index key limit. Starting in version 4.2, MongoDB removes the Index Key Limit for featureCompatibilityVersion (fCV)įor MongoDB 2.6 through MongoDB versions with fCV set to "4.0" orĮarlier, the total size of an index entry, which can include If the _id contains subfields, the subfield Must be unique in the collection, is immutable, and may be of any type The field name _id is reserved for use as a primary key its value Seeįield Name Considerations for more details. MongodB 5.0 adds improved support for the use of ( $) and (. The server permits storage of field names that contain dots (. Field names cannot contain the null character. 
For featureCompatibilityVersion set to "4.2" orĮarlier, the maximum length of the collection/view namespace remains. For a collection or a view, the namespace includes theĭatabase name, the dot (. Greater, MongoDB raises the limit on collection/view For featureCompatibilityVersion set to "4.4" or. 
Mongosh or a similar method for your driver. Underscore character, or begins with numbers, then to access theĬollection use the db.getCollection() method in
If your collection name includes special characters, such as the Restriction on Collection Names ¶Ĭollection names should begin with an underscore or a letter Length of Database Names ¶ĭatabase names cannot be empty and must have fewer than 64 characters. Also database names cannot contain the null character.
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