Library reference docs
Namespaces
google::cloud::spanner
Classes
Client
Functions
DatabaseAdminClient
Functions
LimitedErrorCountTransactionRerunPolicy
LimitedTimeTransactionRerunPolicy
Structs
Functions
Operators
google::cloud::spanner_admin
Classes
DatabaseAdminClient
Functions
DatabaseAdminConnectionIdempotencyPolicy
DatabaseAdminLimitedErrorCountRetryPolicy
DatabaseAdminLimitedTimeRetryPolicy
InstanceAdminClient
Functions
InstanceAdminConnectionIdempotencyPolicy
InstanceAdminLimitedErrorCountRetryPolicy
InstanceAdminLimitedTimeRetryPolicy
Structs
google::cloud::spanner_admin_mocks
Stay organized with collections Save and categorize content based on your preferences.
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_SPANNER_DEFAULT_ENDPOINT=...: changes the default endpoint (spanner.googleapis.com) for the library. Intended for testing only.
SPANNER_EMULATOR_HOST=host:port: tells the library to connect to the specified emulator rather than the default endpoint. Intended for testing only.
SPANNER_OPTIMIZER_VERSION=n: sets the default query optimizer version to use in Client::ExecuteQuery() calls.
google::cloud::spanner::QueryOptimizerVersionOptionSPANNER_OPTIMIZER_STATISTICS_PACKAGE=...: specifies a statistics package for the query optimizer to use when compiling a SQL query.
google::cloud::spanner::QueryOptimizerStatisticsPackageOption
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.
GOOGLE_CLOUD_CPP_SPANNER_TEST_INSTANCE_ID=... is used in examples and integration tests to, well, configure the spanner instance. This has no effect in the library.
GOOGLE_CLOUD_CPP_SPANNER_TEST_SERVICE_ACCOUNT=...: is used in examples and integration tests to set the service account for testing IAM operations. 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."],[[["This document lists available versions of the Spanner C++ library, ranging from version 2.11.0 up to the latest release candidate, 2.37.0-rc."],["The document describes environment variables that can be used to configure the library's behavior, particularly for testing purposes like overriding the default endpoint or connecting to an emulator."],["Several environment variables control the query optimizer's behavior, including `SPANNER_OPTIMIZER_VERSION` and `SPANNER_OPTIMIZER_STATISTICS_PACKAGE`."],["Environment variables like `GOOGLE_CLOUD_CPP_ENABLE_TRACING` and `GOOGLE_CLOUD_CPP_ENABLE_CLOG` are available to configure gRPC call tracing and logging within the library."],["Environment variables such as `GOOGLE_CLOUD_PROJECT`, `GOOGLE_CLOUD_CPP_SPANNER_TEST_INSTANCE_ID`, and `GOOGLE_CLOUD_CPP_SPANNER_TEST_SERVICE_ACCOUNT` are used in examples and integration tests but do not affect the library's functionality."]]],[]]
RetroSearch is an open source project built by @garambo | Open a GitHub Issue
Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo
HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.4