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_ANALYTICS_HUB_SERVICE_ENDPOINT=...overrides theEndpointOption(which defaults to "analyticshub.googleapis.com") used byMakeAnalyticsHubServiceConnection().
GOOGLE_CLOUD_CPP_BIGQUERY_CONNECTION_SERVICE_ENDPOINT=...overrides theEndpointOption(which defaults to "bigqueryconnection.googleapis.com") used byMakeConnection().
GOOGLE_CLOUD_CPP_BIGQUERY_READ_ENDPOINT=...overrides theEndpointOption(which defaults to "bigquerystorage.googleapis.com") used byMakeBigQueryReadConnection().
GOOGLE_CLOUD_CPP_BIGQUERY_WRITE_ENDPOINT=...overrides theEndpointOption(which defaults to "bigquerystorage.googleapis.com") used byMakeBigQueryWriteConnection().
GOOGLE_CLOUD_CPP_DATA_POLICY_SERVICE_ENDPOINT=...overrides theEndpointOption(which defaults to "bigquerydatapolicy.googleapis.com") used byMakeDataPolicyServiceConnection().
GOOGLE_CLOUD_CPP_DATA_TRANSFER_SERVICE_ENDPOINT=...overrides theEndpointOption(which defaults to "bigquerydatatransfer.googleapis.com") used byMakeDataTransferServiceConnection().
GOOGLE_CLOUD_CPP_METASTORE_SERVICE_ENDPOINT=...overrides theEndpointOption(which defaults to "biglake.googleapis.com") used byMakeMetastoreServiceConnection().
GOOGLE_CLOUD_CPP_MIGRATION_SERVICE_ENDPOINT=...overrides theEndpointOption(which defaults to "bigquerymigration.googleapis.com") used byMakeMigrationServiceConnection().
GOOGLE_CLOUD_CPP_RESERVATION_SERVICE_ENDPOINT=...overrides theEndpointOption(which defaults to "bigqueryreservation.googleapis.com") used byMakeReservationServiceConnection().
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\u003eThis document outlines various versions of the C++ BigQuery library, ranging from version 2.11.0 up to the latest release candidate 2.37.0-rc.\u003c/p\u003e\n"],["\u003cp\u003eThe document details several environment variables that can be used to override default endpoint settings for different BigQuery services, such as \u003ccode\u003eGOOGLE_CLOUD_CPP_BIGQUERY_READ_ENDPOINT\u003c/code\u003e and others.\u003c/p\u003e\n"],["\u003cp\u003eLogging and tracing for gRPC calls can be enabled using the \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_TRACING\u003c/code\u003e environment variable, with additional control provided by \u003ccode\u003eGOOGLE_CLOUD_CPP_TRACING_OPTIONS\u003c/code\u003e and the ability to print to the console using \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_CLOG\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eGOOGLE_CLOUD_PROJECT\u003c/code\u003e environment variable can be used in examples and integration tests to set the GCP project but is not used directly within the library itself.\u003c/p\u003e\n"]]],[],null,["Version 2.30.0keyboard_arrow_down\n\n- [2.42.0-rc (latest)](/cpp/docs/reference/bigquery/latest/bigquery-env)\n- [2.41.0](/cpp/docs/reference/bigquery/2.41.0/bigquery-env)\n- [2.40.0](/cpp/docs/reference/bigquery/2.40.0/bigquery-env)\n- [2.39.0](/cpp/docs/reference/bigquery/2.39.0/bigquery-env)\n- [2.38.0](/cpp/docs/reference/bigquery/2.38.0/bigquery-env)\n- [2.37.0](/cpp/docs/reference/bigquery/2.37.0/bigquery-env)\n- [2.36.0](/cpp/docs/reference/bigquery/2.36.0/bigquery-env)\n- [2.35.0](/cpp/docs/reference/bigquery/2.35.0/bigquery-env)\n- [2.34.0](/cpp/docs/reference/bigquery/2.34.0/bigquery-env)\n- [2.33.0](/cpp/docs/reference/bigquery/2.33.0/bigquery-env)\n- [2.32.0](/cpp/docs/reference/bigquery/2.32.0/bigquery-env)\n- [2.31.0](/cpp/docs/reference/bigquery/2.31.0/bigquery-env)\n- [2.30.0](/cpp/docs/reference/bigquery/2.30.0/bigquery-env)\n- [2.29.0](/cpp/docs/reference/bigquery/2.29.0/bigquery-env)\n- [2.28.0](/cpp/docs/reference/bigquery/2.28.0/bigquery-env)\n- [2.27.0](/cpp/docs/reference/bigquery/2.27.0/bigquery-env)\n- [2.26.0](/cpp/docs/reference/bigquery/2.26.0/bigquery-env)\n- [2.25.1](/cpp/docs/reference/bigquery/2.25.1/bigquery-env)\n- [2.24.0](/cpp/docs/reference/bigquery/2.24.0/bigquery-env)\n- [2.23.0](/cpp/docs/reference/bigquery/2.23.0/bigquery-env)\n- [2.22.1](/cpp/docs/reference/bigquery/2.22.1/bigquery-env)\n- [2.21.0](/cpp/docs/reference/bigquery/2.21.0/bigquery-env)\n- [2.20.0](/cpp/docs/reference/bigquery/2.20.0/bigquery-env)\n- [2.19.0](/cpp/docs/reference/bigquery/2.19.0/bigquery-env)\n- [2.18.0](/cpp/docs/reference/bigquery/2.18.0/bigquery-env)\n- [2.17.0](/cpp/docs/reference/bigquery/2.17.0/bigquery-env)\n- [2.16.0](/cpp/docs/reference/bigquery/2.16.0/bigquery-env)\n- [2.15.1](/cpp/docs/reference/bigquery/2.15.1/bigquery-env)\n- [2.14.0](/cpp/docs/reference/bigquery/2.14.0/bigquery-env)\n- [2.13.0](/cpp/docs/reference/bigquery/2.13.0/bigquery-env)\n- [2.12.0](/cpp/docs/reference/bigquery/2.12.0/bigquery-env)\n- [2.11.0](/cpp/docs/reference/bigquery/2.11.0/bigquery-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_ANALYTICS_HUB_SERVICE_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"analyticshub.googleapis.com\") used by `MakeAnalyticsHubServiceConnection()`.\n- `GOOGLE_CLOUD_CPP_BIGQUERY_CONNECTION_SERVICE_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"bigqueryconnection.googleapis.com\") used by `MakeConnection()`.\n- `GOOGLE_CLOUD_CPP_BIGQUERY_READ_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"bigquerystorage.googleapis.com\") used by `MakeBigQueryReadConnection()`.\n- `GOOGLE_CLOUD_CPP_BIGQUERY_WRITE_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"bigquerystorage.googleapis.com\") used by `MakeBigQueryWriteConnection()`.\n- `GOOGLE_CLOUD_CPP_DATA_POLICY_SERVICE_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"bigquerydatapolicy.googleapis.com\") used by `MakeDataPolicyServiceConnection()`.\n- `GOOGLE_CLOUD_CPP_DATA_TRANSFER_SERVICE_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"bigquerydatatransfer.googleapis.com\") used by `MakeDataTransferServiceConnection()`.\n- `GOOGLE_CLOUD_CPP_METASTORE_SERVICE_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"biglake.googleapis.com\") used by `MakeMetastoreServiceConnection()`.\n- `GOOGLE_CLOUD_CPP_MIGRATION_SERVICE_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"bigquerymigration.googleapis.com\") used by `MakeMigrationServiceConnection()`.\n- `GOOGLE_CLOUD_CPP_RESERVATION_SERVICE_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"bigqueryreservation.googleapis.com\") used by `MakeReservationServiceConnection()`.\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."]]
