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Note

Because the BigQuery client uses the third-party :mod:`requests` library by default and the BigQuery-Storage client uses :mod:`grpcio` library, both are safe to share instances across threads. In multiprocessing scenarios, the best practice is to create client instances after :class:`multiprocessing.Pool` or :class:`multiprocessing.Process` invokes :func:`os.fork`.

More Examples

.. toctree::
  :maxdepth: 2

  usage/index
  Official Google BigQuery How-to Guides <https://cloud.google.com/bigquery/docs/how-to>

API Reference

.. toctree::
  :maxdepth: 2

  reference
  dbapi
  design/index

Migration Guide

See the guides below for instructions on migrating from older to newer major releases of this library (from 1.x to 2.x, or from 2.x to 3.x).

.. toctree::
    :maxdepth: 2

    UPGRADING

Changelog

For a list of all google-cloud-bigquery releases:

.. toctree::
  :maxdepth: 2

  changelog


.. toctree::
  :hidden:

  summary_overview.md