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Indexed field whose corresponding index entry would exceed the index key limit,Īnd instead, will return an error.
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Reindexing operations occur as part of theĪs the db.collection.reIndex() method.Because these operations drop all the indexes from a collection and
THUMBSPLUS 10 MAXIMUM DATABASE SIZE DRIVER
If a 5.0 driver sends a document to an older The restrictions are removed regardless of the server version theĭriver is connected to. These field names generated a client-side Using documents with field names that are dollar ( $) prefixed or
THUMBSPLUS 10 MAXIMUM DATABASE SIZE DRIVERS
) if theseįield names are used in conjunction with unacknowledged writesĬommands, drivers that are 5.0 compatible remove restrictions on
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There is a small chance of data loss when using dollar ( $) prefixedįield names or field names that contain periods (. Possible Data Loss With Dollar Signs ( $) and Periods (. ) in a field name will be misinterpreted as a level of There are also restrictions on using mongoimport and Do not use Extended JSONįormats in contexts where the corresponding BSON representations However,Īs expected in some situations with field names that make use of theseĬannot differentiate between type wrappers and fields that happen to Starting in MongoDB 5.0, document field names can be dollar ( $) Import and Export Concerns With Dollar Signs ( $) and Periods (. For example, inserting a BSON document with duplicateįield names through a MongoDB driver may result in the driver silentlyĭropping the duplicate values prior to insertion. Inserting these documents into MongoDB is not supported even if the
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While the BSON builder may not throw an error, BSON builders may support creating a BSON document withĭuplicate field names. The MongoDB Query Language is undefined over documents with duplicateįield names. MongoDB does not support duplicate field names ¶ Use caution, the issues discussed in this section could lead to data 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.