Limitations

While the Unity MongoDB driver does provide a SQL layer on top of MongoDB, that does not make it a relational database. While much of SQL is available, not every SQL construct can be used.

A limitation is:

The only key field in a MongoDB document is named _id and is automatically created if not supplied. When a synonym is created, this field is created as READONLY and AUTOINCREMENT. If this is not the desired behavior and you want to supply your own values for this field, use the Synonym Editor to change these attributes.


WebFOCUS