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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.
Endpoint OverridesGOOGLE_CLOUD_CPP_DATASET_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "bigquery.googleapis.com") used by MakeDatasetServiceConnection().GOOGLE_CLOUD_CPP_JOB_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "bigquery.googleapis.com") used by MakeJobServiceConnection().GOOGLE_CLOUD_CPP_MODEL_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "bigquery.googleapis.com") used by MakeModelServiceConnection().GOOGLE_CLOUD_CPP_PROJECT_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "bigquery.googleapis.com") used by MakeProjectServiceConnection().GOOGLE_CLOUD_CPP_ROUTINE_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "bigquery.googleapis.com") used by MakeRoutineServiceConnection().GOOGLE_CLOUD_CPP_ROW_ACCESS_POLICY_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "bigquery.googleapis.com") used by MakeRowAccessPolicyServiceConnection().GOOGLE_CLOUD_CPP_TABLE_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "bigquery.googleapis.com") used by MakeTableServiceConnection().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_PROJECT=...: is used in examples and integration tests to configure the GCP project. This has no effect in the library.
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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 webpage documents environment variables that configure the behavior of the BigQuery C++ client library, including troubleshooting tools and in-code configuration options."],["Endpoint overrides are configurable via environment variables like `GOOGLE_CLOUD_CPP_DATASET_SERVICE_ENDPOINT`, allowing users to change the default endpoint for various BigQuery services."],["Logging and tracing can be enabled and modified using variables such as `GOOGLE_CLOUD_CPP_ENABLE_TRACING`, `GOOGLE_CLOUD_CPP_TRACING_OPTIONS`, and `GOOGLE_CLOUD_CPP_ENABLE_CLOG`."],["The `GOOGLE_CLOUD_PROJECT` environment variable is used in examples and tests for setting the GCP project but does not directly affect library functionality."],["The page lists previous versions of the library, including the most recent release candidate version `2.37.0-rc`, and many stable releases down to version `2.27.0`."]]],[]]
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