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Showing content from https://cloud.google.com/cpp/docs/reference/bigquery/latest/bigquery-env below:

C++ Client Libraries | Google Cloud

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A number of environment variables can be used to configure the behavior of the library. There are also functions to configure this behavior in code. The environment variables are convenient when troubleshooting problems.

• GOOGLE_CLOUD_CPP_ANALYTICS_HUB_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "analyticshub.googleapis.com") used by MakeAnalyticsHubServiceConnection().
• GOOGLE_CLOUD_CPP_BIGQUERY_CONNECTION_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "bigqueryconnection.googleapis.com") used by MakeConnection().
• GOOGLE_CLOUD_CPP_BIGQUERY_READ_ENDPOINT=... overrides the EndpointOption (which defaults to "bigquerystorage.googleapis.com") used by MakeBigQueryReadConnection().
• GOOGLE_CLOUD_CPP_BIGQUERY_WRITE_ENDPOINT=... overrides the EndpointOption (which defaults to "bigquerystorage.googleapis.com") used by MakeBigQueryWriteConnection().
• GOOGLE_CLOUD_CPP_DATA_POLICY_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "bigquerydatapolicy.googleapis.com") used by MakeDataPolicyServiceConnection().
• GOOGLE_CLOUD_CPP_DATA_TRANSFER_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "bigquerydatatransfer.googleapis.com") used by MakeDataTransferServiceConnection().
• GOOGLE_CLOUD_CPP_METASTORE_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "biglake.googleapis.com") used by MakeMetastoreServiceConnection().
• GOOGLE_CLOUD_CPP_MIGRATION_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "bigquerymigration.googleapis.com") used by MakeMigrationServiceConnection().
• GOOGLE_CLOUD_CPP_RESERVATION_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "bigqueryreservation.googleapis.com") used by MakeReservationServiceConnection().

google::cloud::EndpointOption

GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc: turns on tracing for most gRPC calls. The library injects an additional Stub decorator that prints each gRPC request and response. Unless you have configured your own logging backend, you should also set GOOGLE_CLOUD_CPP_ENABLE_CLOG to produce any output on the program's console.

google::cloud::LoggingComponentsOptionGOOGLE_CLOUD_CPP_TRACING_OPTIONS=...: modifies the behavior of gRPC tracing, including whether messages will be output on multiple lines, or whether string/bytes fields will be truncated.

google::cloud::GrpcTracingOptionsOptionGOOGLE_CLOUD_CPP_ENABLE_CLOG=yes: turns on logging in the library, basically the library always "logs" but the logging infrastructure has no backend to actually print anything until the application sets a backend or they set this environment variable.

google::cloud::LogBackend

google::cloud::LogSink

GOOGLE_CLOUD_PROJECT=...: is used in examples and integration tests to configure the GCP project. This has no effect in the library.

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2025-08-14 UTC.

[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14 UTC."],[[["The latest version available is 2.37.0-rc, with numerous previous versions, down to 2.11.0, also listed for reference."],["Environment variables can be used to customize the library's behavior, offering a convenient method for troubleshooting and fine-tuning the functionality."],["Several environment variables allow users to override the default endpoints for different Google Cloud services, such as `GOOGLE_CLOUD_CPP_BIGQUERY_CONNECTION_SERVICE_ENDPOINT`, `GOOGLE_CLOUD_CPP_BIGQUERY_READ_ENDPOINT`, etc."],["Tracing and logging within the library can be activated and customized using environment variables like `GOOGLE_CLOUD_CPP_ENABLE_TRACING`, `GOOGLE_CLOUD_CPP_TRACING_OPTIONS`, and `GOOGLE_CLOUD_CPP_ENABLE_CLOG`."],["The environment variable `GOOGLE_CLOUD_PROJECT` is used for setting the default GCP project in examples and tests, but it does not affect the library's behavior."]]],[]]

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