Read data in parallel—execute query partition

Use a transaction to execute a query partition for reading data in parallel.

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Code sample

Node.js

To learn how to install and use the client library for Cloud Spanner, see the Cloud Spanner Client Libraries.

// Imports the Google Cloud client library
const {Spanner} = require('@google-cloud/spanner');

/**
 * TODO(developer): Uncomment the following lines before running the sample.
 */
// const projectId = 'my-project-id';
// const instanceId = 'my-instance';
// const databaseId = 'my-database';
// const identifier = {};
// const partition = {};

// Creates a client
const spanner = new Spanner({
  projectId: projectId,
});

// Gets a reference to a Cloud Spanner instance and database
const instance = spanner.instance(instanceId);
const database = instance.database(databaseId);
const transaction = database.batchTransaction(identifier);

const [rows] = await transaction.execute(partition);
console.log(`Successfully received ${rows.length} from executed partition.`);

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