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 Overrides
GOOGLE_CLOUD_CPP_DATASET_SERVICE_ENDPOINT=...overrides theEndpointOption(which defaults to "bigquery.googleapis.com") used byMakeDatasetServiceConnection().
GOOGLE_CLOUD_CPP_JOB_SERVICE_ENDPOINT=...overrides theEndpointOption(which defaults to "bigquery.googleapis.com") used byMakeJobServiceConnection().
GOOGLE_CLOUD_CPP_MODEL_SERVICE_ENDPOINT=...overrides theEndpointOption(which defaults to "bigquery.googleapis.com") used byMakeModelServiceConnection().
GOOGLE_CLOUD_CPP_PROJECT_SERVICE_ENDPOINT=...overrides theEndpointOption(which defaults to "bigquery.googleapis.com") used byMakeProjectServiceConnection().
GOOGLE_CLOUD_CPP_ROUTINE_SERVICE_ENDPOINT=...overrides theEndpointOption(which defaults to "bigquery.googleapis.com") used byMakeRoutineServiceConnection().
GOOGLE_CLOUD_CPP_ROW_ACCESS_POLICY_SERVICE_ENDPOINT=...overrides theEndpointOption(which defaults to "bigquery.googleapis.com") used byMakeRowAccessPolicyServiceConnection().
GOOGLE_CLOUD_CPP_TABLE_SERVICE_ENDPOINT=...overrides theEndpointOption(which defaults to "bigquery.googleapis.com") used byMakeTableServiceConnection().
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 setGOOGLE_CLOUD_CPP_ENABLE_CLOGto produce any output on the program's console.
See Also
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.
See Also
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.
[[["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 2025-09-04 UTC."],[[["\u003cp\u003eThe webpage documents environment variables that configure the behavior of the BigQuery C++ client library, including troubleshooting tools and in-code configuration options.\u003c/p\u003e\n"],["\u003cp\u003eEndpoint overrides are configurable via environment variables like \u003ccode\u003eGOOGLE_CLOUD_CPP_DATASET_SERVICE_ENDPOINT\u003c/code\u003e, allowing users to change the default endpoint for various BigQuery services.\u003c/p\u003e\n"],["\u003cp\u003eLogging and tracing can be enabled and modified using variables such as \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_TRACING\u003c/code\u003e, \u003ccode\u003eGOOGLE_CLOUD_CPP_TRACING_OPTIONS\u003c/code\u003e, and \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_CLOG\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eGOOGLE_CLOUD_PROJECT\u003c/code\u003e environment variable is used in examples and tests for setting the GCP project but does not directly affect library functionality.\u003c/p\u003e\n"],["\u003cp\u003eThe page lists previous versions of the library, including the most recent release candidate version \u003ccode\u003e2.37.0-rc\u003c/code\u003e, and many stable releases down to version \u003ccode\u003e2.27.0\u003c/code\u003e.\u003c/p\u003e\n"]]],[],null,["Version 2.29.0keyboard_arrow_down\n\n- [2.42.0-rc (latest)](/cpp/docs/reference/bigquerycontrol/latest/bigquerycontrol-env)\n- [2.41.0](/cpp/docs/reference/bigquerycontrol/2.41.0/bigquerycontrol-env)\n- [2.40.0](/cpp/docs/reference/bigquerycontrol/2.40.0/bigquerycontrol-env)\n- [2.39.0](/cpp/docs/reference/bigquerycontrol/2.39.0/bigquerycontrol-env)\n- [2.38.0](/cpp/docs/reference/bigquerycontrol/2.38.0/bigquerycontrol-env)\n- [2.37.0](/cpp/docs/reference/bigquerycontrol/2.37.0/bigquerycontrol-env)\n- [2.36.0](/cpp/docs/reference/bigquerycontrol/2.36.0/bigquerycontrol-env)\n- [2.35.0](/cpp/docs/reference/bigquerycontrol/2.35.0/bigquerycontrol-env)\n- [2.34.0](/cpp/docs/reference/bigquerycontrol/2.34.0/bigquerycontrol-env)\n- [2.33.0](/cpp/docs/reference/bigquerycontrol/2.33.0/bigquerycontrol-env)\n- [2.32.0](/cpp/docs/reference/bigquerycontrol/2.32.0/bigquerycontrol-env)\n- [2.31.0](/cpp/docs/reference/bigquerycontrol/2.31.0/bigquerycontrol-env)\n- [2.30.0](/cpp/docs/reference/bigquerycontrol/2.30.0/bigquerycontrol-env)\n- [2.29.0](/cpp/docs/reference/bigquerycontrol/2.29.0/bigquerycontrol-env)\n- [2.28.0](/cpp/docs/reference/bigquerycontrol/2.28.0/bigquerycontrol-env)\n- [2.27.0](/cpp/docs/reference/bigquerycontrol/2.27.0/bigquerycontrol-env) \n\nEnvironment Variables\n=====================\n\nA 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.\n\nEndpoint Overrides\n------------------\n\n- `GOOGLE_CLOUD_CPP_DATASET_SERVICE_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"bigquery.googleapis.com\") used by `MakeDatasetServiceConnection()`.\n- `GOOGLE_CLOUD_CPP_JOB_SERVICE_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"bigquery.googleapis.com\") used by `MakeJobServiceConnection()`.\n- `GOOGLE_CLOUD_CPP_MODEL_SERVICE_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"bigquery.googleapis.com\") used by `MakeModelServiceConnection()`.\n- `GOOGLE_CLOUD_CPP_PROJECT_SERVICE_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"bigquery.googleapis.com\") used by `MakeProjectServiceConnection()`.\n- `GOOGLE_CLOUD_CPP_ROUTINE_SERVICE_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"bigquery.googleapis.com\") used by `MakeRoutineServiceConnection()`.\n- `GOOGLE_CLOUD_CPP_ROW_ACCESS_POLICY_SERVICE_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"bigquery.googleapis.com\") used by `MakeRowAccessPolicyServiceConnection()`.\n- `GOOGLE_CLOUD_CPP_TABLE_SERVICE_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"bigquery.googleapis.com\") used by `MakeTableServiceConnection()`.\n\n###### See Also\n\n[`google::cloud::EndpointOption`](https://cloud.google.com/cpp/docs/reference/common/latest/structgoogle_1_1cloud_1_1EndpointOption.html)\n\nLogging\n-------\n\n`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.\n\n###### See Also\n\n[`google::cloud::LoggingComponentsOption`](https://cloud.google.com/cpp/docs/reference/common/latest/structgoogle_1_1cloud_1_1LoggingComponentsOption.html)`GOOGLE_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.\n\n###### See Also\n\n[`google::cloud::GrpcTracingOptionsOption`](https://cloud.google.com/cpp/docs/reference/common/latest/structgoogle_1_1cloud_1_1GrpcTracingOptionsOption.html)`GOOGLE_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.\n\n###### See Also\n\n[`google::cloud::LogBackend`](https://cloud.google.com/cpp/docs/reference/common/latest/classgoogle_1_1cloud_1_1LogBackend.html)\n\n###### See Also\n\n[`google::cloud::LogSink`](https://cloud.google.com/cpp/docs/reference/common/latest/classgoogle_1_1cloud_1_1LogSink.html)\n\nSetting the Default Project\n---------------------------\n\n`GOOGLE_CLOUD_PROJECT=...`: is used in examples and integration tests to configure the GCP project. This has no effect in the library."]]
