שינוי האזור הראשי של מסד נתונים

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

public class UpdateDatabaseWithDefaultLeaderAsyncSample
{
    public async Task<Operation<Empty, UpdateDatabaseDdlMetadata>> UpdateDatabaseWithDefaultLeaderAsync(string projectId, string instanceId, string databaseId, string defaultLeader)
    {
        DatabaseAdminClient databaseAdminClient = await DatabaseAdminClient.CreateAsync();

        var alterDatabaseStatement = @$"ALTER DATABASE `{databaseId}` SET OPTIONS
                   (default_leader = '{defaultLeader}')";

        // Create the UpdateDatabaseDdl request and execute it.
        var request = new UpdateDatabaseDdlRequest
        {
            DatabaseAsDatabaseName = DatabaseName.FromProjectInstanceDatabase(projectId, instanceId, databaseId),
            Statements = { alterDatabaseStatement }
        };
        var operation = await databaseAdminClient.UpdateDatabaseDdlAsync(request);

        // Wait until the operation has finished.
        Console.WriteLine("Waiting for the operation to finish.");
        Operation<Empty, UpdateDatabaseDdlMetadata> completedResponse = await operation.PollUntilCompletedAsync();
        if (completedResponse.IsFaulted)
        {
            Console.WriteLine($"Error while updating database: {completedResponse.Exception}");
            throw completedResponse.Exception;
        }

        Console.WriteLine("Updated default leader");
        return completedResponse;
    }
}

void UpdateDatabaseWithDefaultLeader(
    google::cloud::spanner_admin::DatabaseAdminClient client,
    std::string const& project_id, std::string const& instance_id,
    std::string const& database_id, std::string const& default_leader) {
  google::cloud::spanner::Database database(project_id, instance_id,
                                            database_id);
  std::vector<std::string> statements;
  statements.push_back("ALTER DATABASE `" + database_id + "` " +
                       "SET OPTIONS (default_leader='" + default_leader + "')");
  auto metadata =
      client.UpdateDatabaseDdl(database.FullName(), std::move(statements))
          .get();
  if (!metadata) throw std::move(metadata).status();
  std::cout << "`default_leader` altered, new DDL metadata:\n"
            << metadata->DebugString();
}

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

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

// updateDatabaseWithDefaultLeader updates the default leader for a given database
func updateDatabaseWithDefaultLeader(w io.Writer, db string, defaultLeader string) error {
	// db = `projects/<project>/instances/<instance-id>/database/<database-id>`
	// defaultLeader = `nam3`
	matches := regexp.MustCompile("^(.+)/databases/(.+)$").FindStringSubmatch(db)
	if matches == nil || len(matches) != 3 {
		return fmt.Errorf("updateDatabaseWithDefaultLeader: invalid database id %q", db)
	}

	ctx := context.Background()
	adminClient, err := database.NewDatabaseAdminClient(ctx)
	if err != nil {
		return err
	}
	defer adminClient.Close()

	op, err := adminClient.UpdateDatabaseDdl(ctx, &adminpb.UpdateDatabaseDdlRequest{
		Database: db,
		Statements: []string{
			fmt.Sprintf(
				"ALTER DATABASE `%s` SET OPTIONS (default_leader = '%s')",
				matches[2], defaultLeader,
			),
		},
	})
	if err != nil