# Mongo ObjectId Key Generates unique object identifiers. Can be assigned to text columns that contain MongoDB `ObjectId` values. The column value must be 12 bytes long. ## Characteristics


Consistency	Yes, can be made self-consistent
Linking	No, cannot be linked
Differential privacy	No
Data-free	No
Allowed for primary keys	No
Allowed for unique columns	No
Uses format-preserving encryption (FPE)	No
Privacy ranking	3 if not consistent 4 if consistent
Generator ID (for the API)	`ObjectIdPkGenerator`

## How to configure To configure the generator: 1. A MongoID object identifier consists of an epoch timestamp, a random value, and an incremented counter.\ \ To only change the random value portion of the identifier, but keep the timestamp and counter portions, toggle **Preserve Timestamp and Incremental Counter** to the on position. 2. Toggle the **Consistency** setting to indicate whether to make the generator self-consistent.\ \ By default, the generator is not consistent. 3. If [Structural data encryption](https://docs.tonic.ai/app/generation/generators-assign-config/generators-data-encryption-config) is enabled, then to use it for this column, in the advanced options section, toggle **Use data encryption process** to the on position. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.tonic.ai/app/generation/generators/generator-reference/mongo-objectid-key.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.