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3.4-backwards-incompatible-features.rst

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The following 3.4 features persist data that earlier MongogDB versions cannot correctly handle and require that featureCompatibilityVersion be set to "3.4":

  • :ref:`3.4-relnotes-views`

  • :ref:`3.4-relnotes-collation`

  • :ref:`3.4-decimal`

  • Index version v: 2. v:2 indexes add support for collation and decimal data type. Earlier index versions support neither collation nor the decimal data type.

    If featureCompatibilityVersion: "3.4", indexes created in MongoDB 3.4 default to v: 2 . Otherwise, new indexes default to v: 1.