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Récupérer des données à l'aide de la récupération à un moment précis (PITR)

Cette page explique comment utiliser la récupération à un moment précis (PITR) pour conserver et récupérer des données dans Spanner.

Pour en savoir plus, consultez la section Récupération à un moment précis.

Prérequis

Ce guide utilise la base de données et le schéma définis dans le guide de démarrage rapide de Spanner. Vous pouvez suivre le guide de démarrage rapide pour créer la base de données et le schéma, ou modifier les commandes à utiliser avec votre propre base de données.

Définir la durée de conservation

Pour définir la durée de conservation de votre base de données, procédez comme suit :

Console

Accédez à la page "Instances Spanner" dans la console Google Cloud.

Accéder à la page "Instances Spanner"
Cliquez sur l'instance contenant la base de données pour ouvrir la page Présentation correspondante.
Cliquez sur la base de données pour ouvrir la page Présentation correspondante.
Sélectionnez l'onglet Sauvegarder/Restaurer.
Cliquez sur l'icône en forme de crayon dans le champ Durée de conservation de la version.
Saisissez une quantité et une unité de temps pour la durée de conservation, puis cliquez sur Mettre à jour.

gcloud

Mettez à jour le schéma de la base de données avec l'instruction ALTER DATABASE. Exemple :

gcloud spanner databases ddl update example-db --instance=test-instance \
    --ddl='ALTER DATABASE `example-db` SET OPTIONS (version_retention_period="7d");'

Pour afficher la durée de conservation, obtenez le LDD de votre base de données :

gcloud spanner databases ddl describe example-db --instance=test-instance

Voici le résultat :

ALTER DATABASE example-db SET OPTIONS (
  version_retention_period = '7d'
);
...

Bibliothèques clientes

C#


using Google.Cloud.Spanner.Data;
using System.Threading.Tasks;

public class CreateDatabaseWithRetentionPeriodAsyncSample
{
    public async Task CreateDatabaseWithRetentionPeriodAsync(string projectId, string instanceId, string databaseId)
    {
        string connectionString = $"Data Source=projects/{projectId}/instances/{instanceId}";

        using var connection = new SpannerConnection(connectionString);
        var versionRetentionPeriod = "7d";
        var createStatement = $"CREATE DATABASE `{databaseId}`";
        var alterStatement = @$"ALTER DATABASE `{databaseId}` SET OPTIONS
                   (version_retention_period = '{versionRetentionPeriod}')";
        // The retention period cannot be set as part of the CREATE DATABASE statement,
        // but can be set using an ALTER DATABASE statement directly after database creation.
        using var createDbCommand = connection.CreateDdlCommand(
            createStatement,
            alterStatement
        );
        await createDbCommand.ExecuteNonQueryAsync();
    }
}

C++

void CreateDatabaseWithVersionRetentionPeriod(
    google::cloud::spanner_admin::DatabaseAdminClient client,
    std::string const& project_id, std::string const& instance_id,
    std::string const& database_id) {
  google::cloud::spanner::Database database(project_id, instance_id,
                                            database_id);
  google::spanner::admin::database::v1::CreateDatabaseRequest request;
  request.set_parent(database.instance().FullName());
  request.set_create_statement("CREATE DATABASE `" + database.database_id() +
                               "`");
  request.add_extra_statements("ALTER DATABASE `" + database.database_id() +
                               "` " +
                               "SET OPTIONS (version_retention_period='2h')");
  request.add_extra_statements(R"""(
      CREATE TABLE Singers (
          SingerId   INT64 NOT NULL,
          FirstName  STRING(1024),
          LastName   STRING(1024),
          SingerInfo BYTES(MAX),
          FullName   STRING(2049)
              AS (ARRAY_TO_STRING([FirstName, LastName], " ")) STORED
      ) PRIMARY KEY (SingerId))""");
  request.add_extra_statements(R"""(
      CREATE TABLE Albums (
          SingerId     INT64 NOT NULL,
          AlbumId      INT64 NOT NULL,
          AlbumTitle   STRING(MAX)
      ) PRIMARY KEY (SingerId, AlbumId),
          INTERLEAVE IN PARENT Singers ON DELETE CASCADE)""");
  auto db = client.CreateDatabase(request).get();
  if (!db) throw std::move(db).status();
  std::cout << "Database " << db->name() << " created.\n";

  auto ddl = client.GetDatabaseDdl(db->name());
  if (!ddl) throw std::move(ddl).status();
  std::cout << "Database DDL is:\n" << ddl->DebugString();
}

Go

import (
	"context"
	"fmt"
	"io"
	"regexp"

	database "cloud.google.com/go/spanner/admin/database/apiv1"
	adminpb "cloud.google.com/go/spanner/admin/database/apiv1/databasepb"
)

func createDatabaseWithRetentionPeriod(ctx context.Context, w io.Writer, db string) error {
	matches := regexp.MustCompile("^(.+)/databases/(.+)$").FindStringSubmatch(db)
	if matches == nil || len(matches) != 3 {
		return fmt.Errorf("createDatabaseWithRetentionPeriod: invalid database id %q", db)
	}

	adminClient, err := database.NewDatabaseAdminClient(ctx)
	if err != nil {
		return fmt.Errorf("createDatabaseWithRetentionPeriod.NewDatabaseAdminClient: %w", err)
	}
	defer adminClient.Close()

	// Create a database with a version retention period of 7 days.
	retentionPeriod := "7d"
	alterDatabase := fmt.Sprintf(
		"ALTER DATABASE `%s` SET OPTIONS (version_retention_period = '%s')",
		matches[2], retentionPeriod,
	)
	req := adminpb.CreateDatabaseRequest{
		Parent:          matches[1],
		CreateStatement: "CREATE DATABASE `" + matches[2] + "`",
		ExtraStatements: []string{
			`CREATE TABLE Singers (
				SingerId   INT64 NOT NULL,
				FirstName  STRING(1024),
				LastName   STRING(1024),
				SingerInfo BYTES(MAX)
			) PRIMARY KEY (SingerId)`,
			`CREATE TABLE Albums (
				SingerId     INT64 NOT NULL,
				AlbumId      INT64 NOT NULL,
				AlbumTitle   STRING(MAX)
			) PRIMARY KEY (SingerId, AlbumId),
			INTERLEAVE IN PARENT Singers ON DELETE CASCADE`,
			alterDatabase,
		},
	}
	op, err := adminClient.CreateDatabase(ctx, &req)
	if err != nil {
		return fmt.Errorf("createDatabaseWithRetentionPeriod.CreateDatabase: %w", err)
	}
	if _, err := op.Wait(ctx); err != nil {
		return fmt.Errorf("createDatabaseWithRetentionPeriod.Wait: %w", err)
	}
	fmt.Fprintf(w, "Created database [%s] with version retention period %q\n", db, retentionPeriod)
	return nil
}

Java


import com.google.cloud.spanner.Spanner;
import com.google.cloud.spanner.SpannerException;
import com.google.cloud.spanner.SpannerExceptionFactory;
import com.google.cloud.spanner.SpannerOptions;
import com.google.cloud.spanner.admin.database.v1.DatabaseAdminClient;
import com.google.common.collect.Lists;
import com.google.spanner.admin.database.v1.CreateDatabaseRequest;
import com.google.spanner.admin.database.v1.Database;
import com.google.spanner.admin.database.v1.InstanceName;
import java.util.concurrent.ExecutionException;

public class CreateDatabaseWithVersionRetentionPeriodSample {

  static void createDatabaseWithVersionRetentionPeriod() {
    // TODO(developer): Replace these variables before running the sample.
    String projectId = "my-project";
    String instanceId = "my-instance";
    String databaseId = "my-database";
    String versionRetentionPeriod = "7d";

    createDatabaseWithVersionRetentionPeriod(projectId, instanceId, databaseId,
        versionRetentionPeriod);
  }

  static void createDatabaseWithVersionRetentionPeriod(String projectId,
      String instanceId, String databaseId, String versionRetentionPeriod) {
    try (Spanner spanner =
        SpannerOptions.newBuilder().setProjectId(projectId).build().getService();
        DatabaseAdminClient databaseAdminClient = spanner.createDatabaseAdminClient()) {
      CreateDatabaseRequest request =
          CreateDatabaseRequest.newBuilder()
              .setParent(InstanceName.of(projectId, instanceId).toString())
              .setCreateStatement("CREATE DATABASE `" + databaseId + "`")
              .addAllExtraStatements(Lists.newArrayList("ALTER DATABASE " + "`" + databaseId + "`"
                  + " SET OPTIONS ( version_retention_period = '" + versionRetentionPeriod + "' )"))
              .build();
      Database database =
          databaseAdminClient.createDatabaseAsync(request).get();
      System.out.println("Created database [" + database.getName() + "]");
      System.out.println("\tVersion retention period: " + database.getVersionRetentionPeriod());
      System.out.println("\tEarliest version time: " + database.getEarliestVersionTime());
    } catch (ExecutionException e) {
      // If the operation failed during execution, expose the cause.
      throw (SpannerException) e.getCause();
    } catch (InterruptedException e) {
      // Throw when a thread is waiting, sleeping, or otherwise occupied,
      // and the thread is interrupted, either before or during the activity.
      throw SpannerExceptionFactory.propagateInterrupt(e);
    }
  }
}

Node.js


// 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';

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

// Gets a reference to a Cloud Spanner Database Admin Client object
const databaseAdminClient = spanner.getDatabaseAdminClient();

try {
  // Create a new database with an extra statement which will alter the
  // database after creation to set the version retention period.
  console.log(
    `Creating database ${databaseAdminClient.instancePath(
      projectId,
      instanceId
    )}.`
  );
  const versionRetentionStatement = `
    ALTER DATABASE \`${databaseId}\`
    SET OPTIONS (version_retention_period = '1d')`;

  const [operation] = await databaseAdminClient.createDatabase({
    createStatement: 'CREATE DATABASE `' + databaseId + '`',
    extraStatements: [versionRetentionStatement],
    parent: databaseAdminClient.instancePath(projectId, instanceId),
  });

  console.log(`Waiting for operation on ${databaseId} to complete...`);
  await operation.promise();
  console.log(`
      Created database ${databaseId} with version retention period.`);

  const [metadata] = await databaseAdminClient.getDatabase({
    name: databaseAdminClient.databasePath(projectId, instanceId, databaseId),
  });

  console.log(`Version retention period: ${metadata.versionRetentionPeriod}`);
  const milliseconds =
    parseInt(metadata.earliestVersionTime.seconds, 10) * 1000 +
    parseInt(metadata.earliestVersionTime.nanos, 10) / 1e6;
  const date = new Date(milliseconds);
  console.log(`Earliest version time: ${date.toString()}`);
} catch (err) {
  console.error('ERROR:', err);
}

PHP

use Google\Cloud\Spanner\Admin\Database\V1\Client\DatabaseAdminClient;
use Google\Cloud\Spanner\Admin\Database\V1\CreateDatabaseRequest;
use Google\Cloud\Spanner\Admin\Database\V1\GetDatabaseRequest;

/**
 * Creates a database with data retention for Point In Time Restore.
 * Example:
 * ```
 * create_database_with_version_retention_period($projectId, $instanceId, $databaseId, $retentionPeriod);
 * ```
 *
 * @param string $projectId The Google Cloud project ID.
 * @param string $instanceId The Spanner instance ID.
 * @param string $databaseId The Spanner database ID.
 * @param string $retentionPeriod The data retention period for the database.
 */
function create_database_with_version_retention_period(
    string $projectId,
    string $instanceId,
    string $databaseId,
    string $retentionPeriod
): void {
    $databaseAdminClient = new DatabaseAdminClient();
    $instance = $databaseAdminClient->instanceName($projectId, $instanceId);
    $databaseFullName = $databaseAdminClient->databaseName($projectId, $instanceId, $databaseId);

    $operation = $databaseAdminClient->createDatabase(
        new CreateDatabaseRequest([
            'parent' => $instance,
            'create_statement' => sprintf('CREATE DATABASE `%s`', $databaseId),
            'extra_statements' => [
                'CREATE TABLE Singers (' .
                'SingerId     INT64 NOT NULL,' .
                'FirstName    STRING(1024),' .
                'LastName     STRING(1024),' .
                'SingerInfo   BYTES(MAX)' .
                ') PRIMARY KEY (SingerId)',
                'CREATE TABLE Albums (' .
                    'SingerId     INT64 NOT NULL,' .
                    'AlbumId      INT64 NOT NULL,' .
                    'AlbumTitle   STRING(MAX)' .
                ') PRIMARY KEY (SingerId, AlbumId),' .
                'INTERLEAVE IN PARENT Singers ON DELETE CASCADE',
                "ALTER DATABASE `$databaseId` SET OPTIONS(version_retention_period='$retentionPeriod')"
            ]
        ])
    );

    print('Waiting for operation to complete...' . PHP_EOL);
    $operation->pollUntilComplete();

    $request = new GetDatabaseRequest(['name' => $databaseFullName]);
    $databaseInfo = $databaseAdminClient->getDatabase($request);

    print(sprintf(
        'Database %s created with version retention period %s',
        $databaseInfo->getName(), $databaseInfo->getVersionRetentionPeriod()
    ) . PHP_EOL);
}

Python

def create_database_with_version_retention_period(
    instance_id, database_id, retention_period
):
    """Creates a database with a version retention period."""

    from google.cloud.spanner_admin_database_v1.types import \
        spanner_database_admin

    spanner_client = spanner.Client()
    database_admin_api = spanner_client.database_admin_api
    ddl_statements = [
        "CREATE TABLE Singers ("
        + "  SingerId   INT64 NOT NULL,"
        + "  FirstName  STRING(1024),"
        + "  LastName   STRING(1024),"
        + "  SingerInfo BYTES(MAX)"
        + ") PRIMARY KEY (SingerId)",
        "CREATE TABLE Albums ("
        + "  SingerId     INT64 NOT NULL,"
        + "  AlbumId      INT64 NOT NULL,"
        + "  AlbumTitle   STRING(MAX)"
        + ") PRIMARY KEY (SingerId, AlbumId),"
        + "  INTERLEAVE IN PARENT Singers ON DELETE CASCADE",
        "ALTER DATABASE `{}`"
        " SET OPTIONS (version_retention_period = '{}')".format(
            database_id, retention_period
        ),
    ]
    operation = database_admin_api.create_database(
        request=spanner_database_admin.CreateDatabaseRequest(
            parent=database_admin_api.instance_path(
                spanner_client.project, instance_id
            ),
            create_statement="CREATE DATABASE `{}`".format(database_id),
            extra_statements=ddl_statements,
        )
    )

    db = operation.result(30)
    print(
        "Database {} created with version retention period {} and earliest version time {}".format(
            db.name, db.version_retention_period, db.earliest_version_time
        )
    )

    database_admin_api.drop_database(
        spanner_database_admin.DropDatabaseRequest(database=db.name)
    )

Ruby

# project_id  = "Your Google Cloud project ID"
# instance_id = "Your Spanner instance ID"
# database_id = "Your Spanner database ID"

require "google/cloud/spanner"
require "google/cloud/spanner/admin/database"

database_admin_client = Google::Cloud::Spanner::Admin::Database.database_admin

instance_path = database_admin_client.instance_path project: project_id, instance: instance_id

version_retention_period = "7d"

db_path = database_admin_client.database_path project: project_id,
                                              instance: instance_id,
                                              database: database_id

job = database_admin_client.create_database parent: instance_path,
                                            create_statement: "CREATE DATABASE `#{database_id}`",
                                            extra_statements: [
                                              "CREATE TABLE Singers (
    SingerId     INT64 NOT NULL,
    FirstName    STRING(1024),
    LastName     STRING(1024),
    SingerInfo   BYTES(MAX)
  ) PRIMARY KEY (SingerId)",

                                              "CREATE TABLE Albums (
    SingerId     INT64 NOT NULL,
    AlbumId      INT64 NOT NULL,
    AlbumTitle   STRING(MAX)
  ) PRIMARY KEY (SingerId, AlbumId),
  INTERLEAVE IN PARENT Singers ON DELETE CASCADE",

                                              "ALTER DATABASE `#{database_id}`
    SET OPTIONS ( version_retention_period = '#{version_retention_period}' )"
                                            ]

puts "Waiting for create database operation to complete"

job.wait_until_done!
database = database_admin_client.get_database name: db_path

puts "Created database #{database_id} on instance #{instance_id}"
puts "\tVersion retention period: #{database.version_retention_period}"
puts "\tEarliest version time: #{database.earliest_version_time}"

Consignes d'utilisation :

La durée de conservation doit être comprise entre 1 heure et 7 jours et peut être spécifiée en jours, en heures, en minutes ou en secondes. Par exemple, les valeurs 1d, 24h, 1440m et 86400s sont équivalentes.
Si vous avez activé la journalisation pour l'API Spanner dans votre projet, l'événement est consigné en tant que UpdateDatabaseDdl et est visible dans l'explorateur de journaux.
Pour rétablir la durée de conservation par défaut d'une heure, vous pouvez définir l'option de base de données version_retention_period sur NULL pour les bases de données Google SQL ou DEFAULT pour les bases de données PostgreSQL.
Lorsque vous prolongez la durée de conservation, le système ne remplit pas les versions précédentes des données. Par exemple, si vous prolongez la durée de conservation de 1 heure à 24 heures, vous devez attendre 23 heures pour que le système accumule d'anciennes données avant de pouvoir récupérer les données des 24 heures précédentes.

Obtenir la durée de conservation et la date de la première version

La ressource Database (Base de données) comporte deux champs :

version_retention_period : période pendant laquelle Spanner conserve toutes les versions de données de la base de données.
earliest_version_time : horodatage le plus ancien à partir duquel les anciennes versions des données peuvent être lues dans la base de données. Cette valeur est mise à jour en continu par Spanner et devient obsolète dès qu'elle est interrogée. Si vous utilisez cette valeur pour récupérer des données, veillez à tenir compte du moment où la valeur est interrogée jusqu'au moment où vous lancez la récupération.

Console

Accédez à la page "Instances Spanner" dans la console Google Cloud.

Accéder à la page "Instances Spanner"
Cliquez sur l'instance contenant la base de données pour ouvrir la page Présentation correspondante.
Cliquez sur la base de données pour ouvrir la page Présentation correspondante.
Sélectionnez l'onglet Sauvegarder/Restaurer pour ouvrir la page Sauvegarder/Restaurer et afficher la durée de conservation.
Cliquez sur Créer pour ouvrir la page Créer une sauvegarde et afficher l'heure de la version la plus ancienne.

gcloud

Vous pouvez obtenir ces champs en appelant describe databases ou list databases. Exemple :

gcloud spanner databases describe example-db --instance=test-instance

Voici le résultat :

createTime: '2020-09-07T16:56:08.285140Z'
earliestVersionTime: '2020-10-07T16:56:08.285140Z'
name: projects/my-project/instances/test-instance/databases/example-db
state: READY
versionRetentionPeriod: 3d

Récupérer une partie de votre base de données

Effectuez une lecture non actualisée et spécifiez l'horodatage de récupération souhaité. Assurez-vous que l'horodatage que vous spécifiez est plus récent que celui de la base de données (earliest_version_time.).
gcloud
Utilisez execute-sql. Exemple :
```
gcloud spanner databases execute-sql example-db --instance=test-instance
    --read-timestamp=2020-09-11T10:19:36.010459-07:00 --sql='SELECT * FROM SINGERS'
```
Bibliothèques clientes
Voir Effectuer une lecture non actualisée.
Stockez les résultats de la requête. Cette opération est nécessaire, car vous ne pouvez pas réécrire les résultats de la requête dans la base de données de la même transaction. Pour de petites quantités de données, vous pouvez imprimer sur la console ou stocker en mémoire. Pour les grandes quantités de données, vous devrez peut-être écrire dans un fichier local.
Réécrivez les données récupérées dans la table à récupérer. Exemple :
gcloud
```
gcloud spanner rows update --instance=test-instance
    --database=example-db --table=Singers --data=SingerId=1,FirstName='Marc'
```
Pour en savoir plus, consultez la section Mettre à jour des données à l'aide de gcloud.
Bibliothèques clientes
Consultez la section Mettre à jour des données à l'aide du langage LMD ou Mettre à jour des données à l'aide de mutations.
Si vous souhaitez effectuer une analyse des données récupérées avant de les réécrire, vous pouvez créer manuellement une table temporaire dans la même base de données, écrire d'abord les données récupérées dans cette table temporaire, effectuer l'analyse, puis lire les données que vous souhaitez récupérer à partir de cette table temporaire et les écrire dans la table à récupérer.

Récupérer une base de données entière

Vous pouvez récupérer l'intégralité de la base de données à l'aide de la fonctionnalité Sauvegarder et restaurer ou Importer et exporter, et en spécifiant un horodatage de récupération.

Sauvegarde et restauration

Créez une sauvegarde et définissez version_time sur l'horodatage de récupération souhaité.

Console

Accédez à la page Détails de la base de données dans la console Cloud.

Accéder à Cloud Console
Dans l'onglet Sauvegarder/Restaurer, cliquez sur Créer.
Cochez la case Créer une sauvegarde à un moment antérieur.

gcloud

gcloud spanner backups create example-db-backup-1 --instance=test-instance \
  --database=example-db --retention-period=1y --version-time=2021-01-22T01:10:35Z --async

Pour en savoir plus, consultez la section Créer une sauvegarde à l'aide de gcloud.

Bibliothèques clientes

C#

// Copyright 2020 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.


using Google.Cloud.Spanner.Admin.Database.V1;
using Google.Cloud.Spanner.Common.V1;
using Google.LongRunning;
using Google.Protobuf.WellKnownTypes;
using System;

public class CreateBackupSample
{
    public Backup CreateBackup(string projectId, string instanceId, string databaseId, string backupId, DateTime versionTime)
    {
        // Create the DatabaseAdminClient instance.
        DatabaseAdminClient databaseAdminClient = DatabaseAdminClient.Create();

        // Initialize request parameters.
        Backup backup = new Backup
        {
            DatabaseAsDatabaseName = DatabaseName.FromProjectInstanceDatabase(projectId, instanceId, databaseId),
            ExpireTime = DateTime.UtcNow.AddDays(14).ToTimestamp(),
            VersionTime = versionTime.ToTimestamp(),
        };
        InstanceName instanceName = InstanceName.FromProjectInstance(projectId, instanceId);

        // Make the CreateBackup request.
        Operation<Backup, CreateBackupMetadata> response = databaseAdminClient.CreateBackup(instanceName, backup, backupId);

        Console.WriteLine("Waiting for the operation to finish.");

        // Poll until the returned long-running operation is complete.
        Operation<Backup, CreateBackupMetadata> completedResponse = response.PollUntilCompleted();

        if (completedResponse.IsFaulted)
        {
            Console.WriteLine($"Error while creating backup: {completedResponse.Exception}");
            throw completedResponse.Exception;
        }

        Console.WriteLine($"Backup created successfully.");

        // GetBackup to get more information about the created backup.
        BackupName backupName = BackupName.FromProjectInstanceBackup(projectId, instanceId, backupId);
        backup = databaseAdminClient.GetBackup(backupName);
        Console.WriteLine($"Backup {backup.Name} of size {backup.SizeBytes} bytes " +
                      $"was created at {backup.CreateTime} from {backup.Database} " +
                      $"and is in state {backup.State} " +
                      $"and has version time {backup.VersionTime.ToDateTime()}");
        return backup;
    }
}

C++

void CreateBackup(google::cloud::spanner_admin::DatabaseAdminClient client,
                  std::string const& project_id, std::string const& instance_id,
                  std::string const& database_id, std::string const& backup_id,
                  google::cloud::spanner::Timestamp expire_time,
                  google::cloud::spanner::Timestamp version_time) {
  google::cloud::spanner::Database database(project_id, instance_id,
                                            database_id);
  google::spanner::admin::database::v1::CreateBackupRequest request;
  request.set_parent(database.instance().FullName());
  request.set_backup_id(backup_id);
  request.mutable_backup()->set_database(database.FullName());
  *request.mutable_backup()->mutable_expire_time() =
      expire_time.get<google::protobuf::Timestamp>().value();
  *request.mutable_backup()->mutable_version_time() =
      version_time.get<google::protobuf::Timestamp>().value();
  auto backup = client.CreateBackup(request).get();
  if (!backup) throw std::move(backup).status();
  std::cout
      << "Backup " << backup->name() << " of " << backup->database()
      << " of size " << backup->size_bytes() << " bytes as of "
      << google::cloud::spanner::MakeTimestamp(backup->version_time()).value()
      << " was created at "
      << google::cloud::spanner::MakeTimestamp(backup->create_time()).value()
      << ".\n";
}

Go


import (
	"context"
	"fmt"
	"io"
	"regexp"
	"time"

	database "cloud.google.com/go/spanner/admin/database/apiv1"
	adminpb "cloud.google.com/go/spanner/admin/database/apiv1/databasepb"
	pbt "github.com/golang/protobuf/ptypes/timestamp"
)

func createBackup(ctx context.Context, w io.Writer, db, backupID string, versionTime time.Time) error {
	// versionTime := time.Now().AddDate(0, 0, -1) // one day ago
	matches := regexp.MustCompile("^(.+)/databases/(.+)$").FindStringSubmatch(db)
	if matches == nil || len(matches) != 3 {
		return fmt.Errorf("createBackup: invalid database id %q", db)
	}

	adminClient, err := database.NewDatabaseAdminClient(ctx)
	if err != nil {
		return fmt.Errorf("createBackup.NewDatabaseAdminClient: %w", err)
	}
	defer adminClient.Close()

	expireTime := time.Now().AddDate(0, 0, 14)
	// Create a backup.
	req := adminpb.CreateBackupRequest{
		Parent:   matches[1],
		BackupId: backupID,
		Backup: &adminpb.Backup{
			Database:    db,
			ExpireTime:  &pbt.Timestamp{Seconds: expireTime.Unix(), Nanos: int32(expireTime.Nanosecond())},
			VersionTime: &pbt.Timestamp{Seconds: versionTime.Unix(), Nanos: int32(versionTime.Nanosecond())},
		},
	}
	op, err := adminClient.CreateBackup(ctx, &req)
	if err != nil {
		return fmt.Errorf("createBackup.CreateBackup: %w", err)
	}
	// Wait for backup operation to complete.
	backup, err := op.Wait(ctx)
	if err != nil {
		return fmt.Errorf("createBackup.Wait: %w", err)
	}

	// Get the name, create time, version time and backup size.
	backupCreateTime := time.Unix(backup.CreateTime.Seconds, int64(backup.CreateTime.Nanos))
	backupVersionTime := time.Unix(backup.VersionTime.Seconds, int64(backup.VersionTime.Nanos))
	fmt.Fprintf(w,
		"Backup %s of size %d bytes was created at %s with version time %s\n",
		backup.Name,
		backup.SizeBytes,
		backupCreateTime.Format(time.RFC3339),
		backupVersionTime.Format(time.RFC3339))
	return nil
}

Java

static void createBackup(DatabaseAdminClient dbAdminClient, String projectId, String instanceId,
    String databaseId, String backupId, Timestamp versionTime) {
  // Set expire time to 14 days from now.
  Timestamp expireTime =
      Timestamp.newBuilder().setSeconds(TimeUnit.MILLISECONDS.toSeconds((
          System.currentTimeMillis() + TimeUnit.DAYS.toMillis(14)))).build();
  BackupName backupName = BackupName.of(projectId, instanceId, backupId);
  Backup backup = Backup.newBuilder()
      .setName(backupName.toString())
      .setDatabase(DatabaseName.of(projectId, instanceId, databaseId).toString())
      .setExpireTime(expireTime).setVersionTime(versionTime).build();

  // Initiate the request which returns an OperationFuture.
  System.out.println("Creating backup [" + backupId + "]...");
  try {
    // Wait for the backup operation to complete.
    backup = dbAdminClient.createBackupAsync(
        InstanceName.of(projectId, instanceId), backup, backupId).get();
    System.out.println("Created backup [" + backup.getName() + "]");
  } catch (ExecutionException e) {
    throw SpannerExceptionFactory.asSpannerException(e);
  } catch (InterruptedException e) {
    throw SpannerExceptionFactory.propagateInterrupt(e);
  }

  // Reload the metadata of the backup from the server.
  backup = dbAdminClient.getBackup(backup.getName());
  System.out.println(
      String.format(
          "Backup %s of size %d bytes was created at %s for version of database at %s",
          backup.getName(),
          backup.getSizeBytes(),
          java.time.OffsetDateTime.ofInstant(
              Instant.ofEpochSecond(backup.getCreateTime().getSeconds(),
                  backup.getCreateTime().getNanos()), ZoneId.systemDefault()),
          java.time.OffsetDateTime.ofInstant(
              Instant.ofEpochSecond(backup.getVersionTime().getSeconds(),
                  backup.getVersionTime().getNanos()), ZoneId.systemDefault()))
  );
}

Node.js


// Imports the Google Cloud client library and precise date library
const {Spanner, protos} = require('@google-cloud/spanner');
const {PreciseDate} = require('@google-cloud/precise-date');

/**
 * TODO(developer): Uncomment the following lines before running the sample.
 */
// const projectId = 'my-project-id';
// const instanceId = 'my-instance';
// const databaseId = 'my-database';
// const backupId = 'my-backup';
// const versionTime = Date.now() - 1000 * 60 * 60 * 24; // One day ago

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

// Gets a reference to a Cloud Spanner Database Admin Client object
const databaseAdminClient = spanner.getDatabaseAdminClient();

// Creates a new backup of the database
try {
  console.log(
    `Creating backup of database ${databaseAdminClient.databasePath(
      projectId,
      instanceId,
      databaseId
    )}.`
  );

  // Expire backup 14 days in the future
  const expireTime = Date.now() + 1000 * 60 * 60 * 24 * 14;

  // Create a backup of the state of the database at the current time.
  const [operation] = await databaseAdminClient.createBackup({
    parent: databaseAdminClient.instancePath(projectId, instanceId),
    backupId: backupId,
    backup: (protos.google.spanner.admin.database.v1.Backup = {
      database: databaseAdminClient.databasePath(
        projectId,
        instanceId,
        databaseId
      ),
      expireTime: Spanner.timestamp(expireTime).toStruct(),
      versionTime: Spanner.timestamp(versionTime).toStruct(),
      name: databaseAdminClient.backupPath(projectId, instanceId, backupId),
    }),
  });

  console.log(
    `Waiting for backup ${databaseAdminClient.backupPath(
      projectId,
      instanceId,
      backupId
    )} to complete...`
  );
  await operation.promise();

  // Verify backup is ready
  const [backupInfo] = await databaseAdminClient.getBackup({
    name: databaseAdminClient.backupPath(projectId, instanceId, backupId),
  });
  if (backupInfo.state === 'READY') {
    console.log(
      `Backup ${backupInfo.name} of size ` +
        `${backupInfo.sizeBytes} bytes was created at ` +
        `${new PreciseDate(backupInfo.createTime).toISOString()} ` +
        'for version of database at ' +
        `${new PreciseDate(backupInfo.versionTime).toISOString()}`
    );
  } else {
    console.error('ERROR: Backup is not ready.');
  }
} catch (err) {
  console.error('ERROR:', err);
} finally {
  // Close the spanner client when finished.
  // The databaseAdminClient does not require explicit closure. The closure of the Spanner client will automatically close the databaseAdminClient.
  spanner.close();
}

PHP

use Google\Cloud\Spanner\Admin\Database\V1\Backup;
use Google\Cloud\Spanner\Admin\Database\V1\GetBackupRequest;
use Google\Cloud\Spanner\Admin\Database\V1\Client\DatabaseAdminClient;
use Google\Cloud\Spanner\Admin\Database\V1\CreateBackupRequest;
use Google\Protobuf\Timestamp;

/**
 * Create a backup.
 * Example:
 * ```
 * create_backup($projectId, $instanceId, $databaseId, $backupId, $versionTime);
 * ```
 *
 * @param string $projectId The Google Cloud project ID.
 * @param string $instanceId The Spanner instance ID.
 * @param string $databaseId The Spanner database ID.
 * @param string $backupId The Spanner backup ID.
 * @param string $versionTime The version of the database to backup. Read more
 * at https://cloud.google.com/spanner/docs/reference/rest/v1/projects.instances.backups#Backup.FIELDS.version_time
 */
function create_backup(
    string $projectId,
    string $instanceId,
    string $databaseId,
    string $backupId,
    string $versionTime = '-1hour'
): void {
    $databaseAdminClient = new DatabaseAdminClient();
    $databaseFullName = DatabaseAdminClient::databaseName($projectId, $instanceId, $databaseId);
    $instanceFullName = DatabaseAdminClient::instanceName($projectId, $instanceId);
    $timestamp = new Timestamp();
    $timestamp->setSeconds((new \DateTime($versionTime))->getTimestamp());
    $expireTime = new Timestamp();
    $expireTime->setSeconds((new \DateTime('+14 days'))->getTimestamp());
    $request = new CreateBackupRequest([
        'parent' => $instanceFullName,
        'backup_id' => $backupId,
        'backup' => new Backup([
            'database' => $databaseFullName,
            'expire_time' => $expireTime,
            'version_time' => $timestamp
        ])
    ]);

    $operation = $databaseAdminClient->createBackup($request);

    print('Waiting for operation to complete...' . PHP_EOL);
    $operation->pollUntilComplete();

    $request = new GetBackupRequest();
    $request->setName($databaseAdminClient->backupName($projectId, $instanceId, $backupId));
    $info = $databaseAdminClient->getBackup($request);
    printf(
        'Backup %s of size %d bytes was created at %d for version of database at %d' . PHP_EOL,
        basename($info->getName()),
        $info->getSizeBytes(),
        $info->getCreateTime()->getSeconds(),
        $info->getVersionTime()->getSeconds());
}

Python

def create_backup(instance_id, database_id, backup_id, version_time):
    """Creates a backup for a database."""

    from google.cloud.spanner_admin_database_v1.types import \
        backup as backup_pb

    spanner_client = spanner.Client()
    database_admin_api = spanner_client.database_admin_api

    # Create a backup
    expire_time = datetime.utcnow() + timedelta(days=14)

    request = backup_pb.CreateBackupRequest(
        parent=database_admin_api.instance_path(spanner_client.project, instance_id),
        backup_id=backup_id,
        backup=backup_pb.Backup(
            database=database_admin_api.database_path(
                spanner_client.project, instance_id, database_id
            ),
            expire_time=expire_time,
            version_time=version_time,
        ),
    )

    operation = database_admin_api.create_backup(request)

    # Wait for backup operation to complete.
    backup = operation.result(2100)

    # Verify that the backup is ready.
    assert backup.state == backup_pb.Backup.State.READY

    print(
        "Backup {} of size {} bytes was created at {} for version of database at {}".format(
            backup.name, backup.size_bytes, backup.create_time, backup.version_time
        )
    )

Ruby

# project_id  = "Your Google Cloud project ID"
# instance_id = "Your Spanner instance ID"
# database_id = "Your Spanner database ID"
# backup_id = "Your Spanner backup ID"
# version_time = Time.now - 60 * 60 * 24 # 1 day ago

require "google/cloud/spanner"
require "google/cloud/spanner/admin/database"

database_admin_client = Google::Cloud::Spanner::Admin::Database.database_admin

instance_path = database_admin_client.instance_path project: project_id, instance: instance_id
db_path = database_admin_client.database_path project: project_id,
                                              instance: instance_id,
                                              database: database_id
backup_path = database_admin_client.backup_path project: project_id,
                                                instance: instance_id,
                                                backup: backup_id
expire_time = Time.now + (14 * 24 * 3600) # 14 days from now

job = database_admin_client.create_backup parent: instance_path,
                                          backup_id: backup_id,
                                          backup: {
                                            database: db_path,
                                              expire_time: expire_time,
                                              version_time: version_time
                                          }

puts "Backup operation in progress"

job.wait_until_done!

backup = database_admin_client.get_backup name: backup_path
puts "Backup #{backup_id} of size #{backup.size_bytes} bytes was created at #{backup.create_time} for version of database at #{backup.version_time}"

Restaurer à partir de la sauvegarde dans une nouvelle base de données. Notez que Spanner conserve le paramètre de durée de conservation de la sauvegarde dans la base de données restaurée.

Console

Accédez à la page Détails de l'instance de Cloud Console.

Accéder à Cloud Console
Dans l'onglet Sauvegarder/Restaurer, sélectionnez une sauvegarde, puis cliquez sur Restaurer.

gcloud

gcloud spanner databases restore --async \
  --destination-instance=destination-instance --destination-database=example-db-restored \
  --source-instance=test-instance --source-backup=example-db-backup-1

Pour en savoir plus, consultez la section Restaurer une base de données à partir d'une sauvegarde.

Bibliothèques clientes

C#


using Google.Cloud.Spanner.Admin.Database.V1;
using Google.Cloud.Spanner.Common.V1;
using Google.LongRunning;
using System;

public class RestoreDatabaseSample
{
    public RestoreInfo RestoreDatabase(string projectId, string instanceId, string databaseId, string backupId)
    {
        // Create the DatabaseAdminClient instance.
        DatabaseAdminClient databaseAdminClient = DatabaseAdminClient.Create();

        InstanceName parentAsInstanceName = InstanceName.FromProjectInstance(projectId, instanceId);
        BackupName backupAsBackupName = BackupName.FromProjectInstanceBackup(projectId, instanceId, backupId);

        // Make the RestoreDatabase request.
        Operation<Database, RestoreDatabaseMetadata> response = databaseAdminClient.RestoreDatabase(parentAsInstanceName, databaseId, backupAsBackupName);

        Console.WriteLine("Waiting for the operation to finish");

        // Poll until the returned long-running operation is complete.
        var completedResponse = response.PollUntilCompleted();

        if (completedResponse.IsFaulted)
        {
            Console.WriteLine($"Database Restore Failed: {completedResponse.Exception}");
            throw completedResponse.Exception;
        }

        RestoreInfo restoreInfo = completedResponse.Result.RestoreInfo;
        Console.WriteLine(
            $"Database {restoreInfo.BackupInfo.SourceDatabase} was restored " +
            $"to {databaseId} from backup {restoreInfo.BackupInfo.Backup} " +
            $"with version time {restoreInfo.BackupInfo.VersionTime.ToDateTime()}");

        return restoreInfo;
    }
}

C++

void RestoreDatabase(google::cloud::spanner_admin::DatabaseAdminClient client,
                     std::string const& project_id,
                     std::string const& instance_id,
                     std::string const& database_id,
                     std::string const& backup_id) {
  google::cloud::spanner::Database database(project_id, instance_id,
                                            database_id);
  google::cloud::spanner::Backup backup(database.instance(), backup_id);
  auto restored_db =
      client
          .RestoreDatabase(database.instance().FullName(),
                           database.database_id(), backup.FullName())
          .get();
  if (!restored_db) throw std::move(restored_db).status();
  std::cout << "Database";
  if (restored_db->restore_info().source_type() ==
      google::spanner::admin::database::v1::BACKUP) {
    auto const& backup_info = restored_db->restore_info().backup_info();
    std::cout << " " << backup_info.source_database() << " as of "
              << google::cloud::spanner::MakeTimestamp(
                     backup_info.version_time())
                     .value();
  }
  std::cout << " restored to " << restored_db->name();
  std::cout << " from backup " << backup.FullName();
  std::cout << ".\n";
}

Go


import (
	"context"
	"fmt"
	"io"
	"regexp"

	database "cloud.google.com/go/spanner/admin/database/apiv1"
	adminpb "cloud.google.com/go/spanner/admin/database/apiv1/databasepb"
)

func restoreBackup(ctx context.Context, w io.Writer, db, backupID string) error {
	adminClient, err := database.NewDatabaseAdminClient(ctx)
	if err != nil {
		return err
	}
	defer adminClient.Close()

	matches := regexp.MustCompile("^(.*)/databases/(.*)$").FindStringSubmatch(db)
	if matches == nil || len(matches) != 3 {
		return fmt.Errorf("Invalid database id %s", db)
	}
	instanceName := matches[1]
	databaseID := matches[2]
	backupName := instanceName + "/backups/" + backupID

	// Start restoring backup to a new database.
	restoreOp, err := adminClient.RestoreDatabase(ctx, &adminpb.RestoreDatabaseRequest{
		Parent:     instanceName,
		DatabaseId: databaseID,
		Source: &adminpb.RestoreDatabaseRequest_Backup{
			Backup: backupName,
		},
	})
	if err != nil {
		return err
	}
	// Wait for restore operation to complete.
	dbObj, err := restoreOp.Wait(ctx)
	if err != nil {
		return err
	}
	// Newly created database has restore information.
	backupInfo := dbObj.RestoreInfo.GetBackupInfo()
	if backupInfo != nil {
		fmt.Fprintf(w, "Source database %s restored from backup %s\n", backupInfo.SourceDatabase, backupInfo.Backup)
	}

	return nil
}

Java

static void restoreBackup(
    DatabaseAdminClient dbAdminClient,
    String projectId,
    String instanceId,
    String backupId,
    String restoreToDatabaseId) {
  BackupName backupName = BackupName.of(projectId, instanceId, backupId);
  Backup backup = dbAdminClient.getBackup(backupName);
  // Initiate the request which returns an OperationFuture.
  System.out.println(String.format(
      "Restoring backup [%s] to database [%s]...", backup.getName(), restoreToDatabaseId));
  try {
    RestoreDatabaseRequest request =
        RestoreDatabaseRequest.newBuilder()
            .setParent(InstanceName.of(projectId, instanceId).toString())
            .setDatabaseId(restoreToDatabaseId)
            .setBackup(backupName.toString()).build();
    OperationFuture<com.google.spanner.admin.database.v1.Database, RestoreDatabaseMetadata> op =
        dbAdminClient.restoreDatabaseAsync(request);
    // Wait until the database has been restored.
    com.google.spanner.admin.database.v1.Database db = op.get();
    // Get the restore info.
    RestoreInfo restoreInfo = db.getRestoreInfo();
    BackupInfo backupInfo = restoreInfo.getBackupInfo();

    System.out.println(
        "Restored database ["
            + db.getName()
            + "] from ["
            + restoreInfo.getBackupInfo().getBackup()
            + "] with version time [" + backupInfo.getVersionTime() + "]");
  } catch (ExecutionException e) {
    throw SpannerExceptionFactory.newSpannerException(e.getCause());
  } catch (InterruptedException e) {
    throw SpannerExceptionFactory.propagateInterrupt(e);
  }
}

Node.js

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

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

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

// Gets a reference to a Cloud Spanner Database Admin Client object
const databaseAdminClient = spanner.getDatabaseAdminClient();

// Restore the database
console.log(
  `Restoring database ${databaseAdminClient.databasePath(
    projectId,
    instanceId,
    databaseId
  )} from backup ${backupId}.`
);
const [restoreOperation] = await databaseAdminClient.restoreDatabase({
  parent: databaseAdminClient.instancePath(projectId, instanceId),
  databaseId: databaseId,
  backup: databaseAdminClient.backupPath(projectId, instanceId, backupId),
});

// Wait for restore to complete
console.log('Waiting for database restore to complete...');
await restoreOperation.promise();

console.log('Database restored from backup.');
const [metadata] = await databaseAdminClient.getDatabase({
  name: databaseAdminClient.databasePath(projectId, instanceId, databaseId),
});
console.log(
  `Database ${metadata.restoreInfo.backupInfo.sourceDatabase} was restored ` +
    `to ${databaseId} from backup ${metadata.restoreInfo.backupInfo.backup} ` +
    'with version time ' +
    `${new PreciseDate(
      metadata.restoreInfo.backupInfo.versionTime
    ).toISOString()}.`
);

PHP

use Google\Cloud\Spanner\Admin\Database\V1\Client\DatabaseAdminClient;
use Google\Cloud\Spanner\Admin\Database\V1\RestoreDatabaseRequest;

/**
 * Restore a database from a backup.
 * Example:
 * ```
 * restore_backup($projectId, $instanceId, $databaseId, $backupId);
 * ```
 * @param string $projectId The Google Cloud project ID.
 * @param string $instanceId The Spanner instance ID.
 * @param string $databaseId The Spanner database ID.
 * @param string $backupId The Spanner backup ID.
 */
function restore_backup(
    string $projectId,
    string $instanceId,
    string $databaseId,
    string $backupId
): void {
    $databaseAdminClient = new DatabaseAdminClient();

    $backupName = DatabaseAdminClient::backupName($projectId, $instanceId, $backupId);
    $instanceName = DatabaseAdminClient::instanceName($projectId, $instanceId);

    $request = new RestoreDatabaseRequest([
        'parent' => $instanceName,
        'database_id' => $databaseId,
        'backup' => $backupName
    ]);

    $operationResponse = $databaseAdminClient->restoreDatabase($request);
    $operationResponse->pollUntilComplete();

    $database = $operationResponse->operationSucceeded() ? $operationResponse->getResult() : null;
    $restoreInfo = $database->getRestoreInfo();
    $backupInfo = $restoreInfo->getBackupInfo();
    $sourceDatabase = $backupInfo->getSourceDatabase();
    $sourceBackup = $backupInfo->getBackup();
    $versionTime = $backupInfo->getVersionTime()->getSeconds();
    printf(
        'Database %s restored from backup %s with version time %s' . PHP_EOL,
        $sourceDatabase, $sourceBackup, $versionTime
    );
}

Python

def restore_database(instance_id, new_database_id, backup_id):
    """Restores a database from a backup."""
    from google.cloud.spanner_admin_database_v1 import RestoreDatabaseRequest

    spanner_client = spanner.Client()
    database_admin_api = spanner_client.database_admin_api

    # Start restoring an existing backup to a new database.
    request = RestoreDatabaseRequest(
        parent=database_admin_api.instance_path(spanner_client.project, instance_id),
        database_id=new_database_id,
        backup=database_admin_api.backup_path(
            spanner_client.project, instance_id, backup_id
        ),
    )
    operation = database_admin_api.restore_database(request)

    # Wait for restore operation to complete.
    db = operation.result(1600)

    # Newly created database has restore information.
    restore_info = db.restore_info
    print(
        "Database {} restored to {} from backup {} with version time {}.".format(
            restore_info.backup_info.source_database,
            new_database_id,
            restore_info.backup_info.backup,
            restore_info.backup_info.version_time,
        )
    )

Ruby

# project_id  = "Your Google Cloud project ID"
# instance_id = "Your Spanner instance ID"
# database_id = "Your Spanner database ID of where to restore"
# backup_id = "Your Spanner backup ID"

require "google/cloud/spanner"
require "google/cloud/spanner/admin/database"

database_admin_client = Google::Cloud::Spanner::Admin::Database.database_admin

instance_path = database_admin_client.instance_path project: project_id, instance: instance_id

db_path = database_admin_client.database_path project: project_id,
                                              instance: instance_id,
                                              database: database_id

backup_path = database_admin_client.backup_path project: project_id,
                                                instance: instance_id,
                                                backup: backup_id

job = database_admin_client.restore_database parent: instance_path,
                                             database_id: database_id,
                                             backup: backup_path

puts "Waiting for restore backup operation to complete"

job.wait_until_done!

database = database_admin_client.get_database name: db_path
restore_info = database.restore_info
puts "Database #{restore_info.backup_info.source_database} was restored to #{database_id} from backup #{restore_info.backup_info.backup} with version time #{restore_info.backup_info.version_time}"

Importation et exportation

Exportez la base de données en spécifiant le paramètre snapshotTime vers l'horodatage de récupération souhaité.
Console
1. Accédez à la page Détails de l'instance de la console Cloud.
  
  Accéder à Cloud Console
2. Dans l'onglet Importer/Exporter, cliquez sur Exporter.
3. Cochez la case Exporter la base de données à un moment antérieur.
Pour obtenir des instructions détaillées, consultez la section Exporter une base de données.
gcloud
Utilisez le modèle Dataflow [Spanner] vers Avro](/dataflow/docs/guides/templates/provided-batch#cloud_spanner_to_gcs_avro) pour exporter la base de données.
```
gcloud dataflow jobs run JOB_NAME \
   --gcs-location='gs://cloud-spanner-point-in-time-recovery/Import Export Template/export/templates/Cloud_Spanner_to_GCS_Avro'
   --region=DATAFLOW_REGION --parameters='instanceId=test-instance,databaseId=example-db,outputDir=YOUR_GCS_DIRECTORY,snapshotTime=2020-09-01T23:59:40.125245Z'
```
Consignes d'utilisation :
- Vous pouvez suivre la progression de vos tâches d'importation et d'exportation dans la console Dataflow.
- Spanner garantit la cohérence externe et transactionnelle des données exportées à l'horodatage spécifié.
- Spécifiez l'horodatage au format RFC 3339. Par exemple 2020-09-01T23:59:30.234233Z.
- Assurez-vous que l'horodatage que vous spécifiez est plus récent que celui de la base de données (earliest_version_time). Si les données n'existent plus à l'horodatage spécifié, vous obtenez une erreur.
Importez dans une nouvelle base de données.
Console
1. Accédez à la page Détails de l'instance de Cloud Console.
  
  Accéder à Cloud Console
2. Dans l'onglet Importer/Exporter, cliquez sur Importer.
Pour obtenir des instructions détaillées, consultez la page Importer des fichiers Avro Spanner.
gcloud
Utilisez le modèle Dataflow [Cloud Storage] Avro vers Spanner](/dataflow/docs/guides/templates/provided-batch#gcs_avro_to_cloud_spanner) pour importer les fichiers Avro.
```
gcloud dataflow jobs run JOB_NAME \
   --gcs-location='gs://cloud-spanner-point-in-time-recovery/Import Export Template/import/templates/GCS_Avro_to_Cloud_Spanner' \
   --region=DATAFLOW_REGION \
   --staging-location=YOUR_GCS_STAGING_LOCATION \
   --parameters='instanceId=test-instance,databaseId=example-db,inputDir=YOUR_GCS_DIRECTORY'
```

Estimer l'augmentation de l'espace de stockage

Avant d'augmenter la durée de conservation de la version d'une base de données, vous pouvez estimer l'augmentation prévue de l'utilisation du stockage en totalisant les octets de transaction pour la période souhaitée. Par exemple, la requête suivante calcule le nombre de Gio écrits au cours des 7 derniers jours (168 h) en lisant les tables de statistiques de transactions.

GoogleSQL

SELECT
  SUM(bytes_per_hour) / (1024 * 1024 * 1024 ) as GiB
FROM (
  SELECT
    ((commit_attempt_count - commit_failed_precondition_count - commit_abort_count) * avg_bytes) AS bytes_per_hour,
    interval_end
  FROM
    spanner_sys.txn_stats_total_hour
  ORDER BY
    interval_end DESC
  LIMIT
    168);

PostgreSQL

SELECT
  bph /  (1024 * 1024 * 1024 ) as GiB
FROM (
  SELECT
    SUM(bytes_per_hour) as bph
  FROM (
    SELECT
      ((commit_attempt_count - commit_failed_precondition_count - commit_abort_count) * avg_bytes) AS bytes_per_hour,
      interval_end
    FROM
      spanner_sys.txn_stats_total_hour
    ORDER BY
      interval_end DESC
    LIMIT
      168)
sub1) sub2;

Notez que la requête fournit une estimation approximative et peut être inexacte pour plusieurs raisons :

La requête ne tient pas compte de l'horodatage qui doit être stocké pour chaque version des anciennes données. Si votre base de données est composée de nombreux petits types de données, la requête peut sous-estimer l'augmentation de l'espace de stockage.
La requête inclut toutes les opérations d'écriture, mais seules les opérations de mise à jour créent d'anciennes versions de données. Si votre charge de travail comprend de nombreuses opérations d'insertion, la requête peut surestimer l'augmentation de l'espace de stockage.