The following query parameters can be used with all methods and all resources in the Cloud Spanner API.

Query parameters that apply to all Cloud Spanner API operations are documented atSystem Parameters.

Performance tips

We strongly recommend using theclient librariesfor workloads that involve relatively high queries per second, relatively smallrequests or responses, and where you are concerned about latency or throughput.The libraries have substantially lower overhead than REST or JSON because theyare built on top of thegRPCinterfaces. There are cases where using the REST API makes sense, and you wantto optimize for fewer bytes transferred or smaller JSON responses.