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arangodb/Documentation/Manual/GlossaryDocumentKey.md

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DocumentKey

@GE{Document Key}: A document key uniquely identifies a document in a given collection. It can and should be used by clients when specific documents are searched. Document keys are stored in the _key attribute of documents. The key values are automatically indexed by ArangoDB so looking up a document by its key is regularly a fast operation. The _key value of a document is immutable once the document has been created.