Scheduling queries

This page describes how to schedule recurring queries in BigQuery.

You can schedule queries to run on a recurring basis. Scheduled queries must be written in standard SQL, which can include data definition language (DDL) and data manipulation language (DML) statements. You can organize query results by date and time by parameterizing the query string and destination table.

When you create or update the schedule for a query, the scheduled time for the query is converted from your local time to UTC. UTC is not affected by daylight saving time.

Before you begin

Scheduled queries use features of BigQuery Data Transfer Service. Verify that you have completed all actions required in Enabling BigQuery Data Transfer Service.

Required permissions

To schedule a query, you need the following Identity and Access Management (IAM) permissions:

• bigquery.transfers.update or both bigquery.jobs.create and bigquery.transfers.get to create the transfer
• bigquery.jobs.create to run the scheduled query
• bigquery.datasets.update on the target dataset

To modify a scheduled query, you must be the creator of the schedule and have the following permissions:

• bigquery.jobs.create
• bigquery.transfers.update

The predefined IAM role bigquery.admin role includes all of the permissions that you need to schedule or modify a query. For more information about IAM roles in BigQuery, see Predefined roles and permissions.

Configuration options

Query string

The query string must be valid and written in standard SQL. Each run of a scheduled query can receive the following query parameters.

To manually test a query string with @run_time and @run_date parameters before scheduling a query, use the bq command-line tool.

Available parameters

Parameter	Standard SQL Type	Value
@run_time	TIMESTAMP	Represented in UTC time. For regularly scheduled queries, run_time represents the intended time of execution. For example, if the scheduled query is set to "every 24 hours", the run_time difference between two consecutive queries is exactly 24 hours, even though the actual execution time might slightly vary.
@run_date	DATE	Represents a logical calendar date.

Example

The @run_time parameter is part of the query string in this example, which queries a public dataset named hacker_news.stories.

SELECT @run_time AS time,
  title,
  author,
  text
FROM `bigquery-public-data.hacker_news.stories`
LIMIT
  1000

Destination table

If the destination table for your results doesn't exist when you set up the scheduled query, BigQuery attempts to create the table for you.

If you are using a DDL or DML query, then in the Cloud Console, choose the Processing location or region. Processing location is required for DDL or DML queries that create the destination table.

If the destination table does exist, BigQuery can update the destination table's schema based on the query results. To allow this, either add columns using ALLOW_FIELD_ADDITION or relax a column's mode from REQUIRED to NULLABLE using ALLOW_FIELD_RELAXATION. Otherwise, table schema changes between runs cause the scheduled query to fail.

Queries can reference tables from different projects and different datasets. When configuring your scheduled query, you don't need to include the destination dataset in the table name. You specify the destination dataset separately.

Write preference

The write preference you select determines how your query results are written to an existing destination table.

• WRITE_TRUNCATE: If the table exists, BigQuery overwrites the table data.
• WRITE_APPEND: If the table exists, BigQuery appends the data to the table.

If you're using a DDL or DML query, you can't use the write preference option.

Creating, truncating, or appending a destination table only happens if BigQuery is able to successfully complete the query. Creation, truncation, or append actions occur as one atomic update upon job completion.

Clustering

Scheduled queries can create clustering on new tables only, when the table is made with a DDL CREATE TABLE AS SELECT statement. See Creating a clustered table from a query result on the Using data definition language statements page.

Partitioning options

Scheduled queries can create partitioned or non-partitioned destination tables. Partitioning is available in the Cloud Console, bq command-line tool, and API setup methods. If you're using a DDL or DML query with partitioning, leave the Destination table partitioning field blank.

There are two types of table partitioning in BigQuery:

• Tables partitioned by ingestion time: Tables partitioned based on the scheduled query's runtime.
• Tables partitioned on a column: Tables partitioned based on a TIMESTAMP or DATE column.

For tables partitioned on a column, in the Cloud Console, specify the column name in the Destination table partitioning field when you set up a scheduled query.

For ingestion-time partitioned tables, leave the Destination table partitioning field blank and indicate the date partitioning in the destination table's name. For more information, see Parameter templating syntax.

Partitioning examples

• Table with no partitioning
  • Destination table: mytable
  • Partitioning field: leave blank
• Ingestion-time partitioned table
  • Destination table: mytable$YYYYMMDD
  • Partitioning field: leave blank
• Column-partitioned table
  • Destination table: mytable
  • Partitioning field: name of the TIMESTAMP or DATE column used to partition the table

Available parameters

When setting up the scheduled query, you can specify how you want to partition the destination table with runtime parameters.

Parameter	Template Type	Value
run_time	Formatted timestamp	In UTC time, per the schedule. For regularly scheduled queries, run_time represents the intended time of execution. For example, if the scheduled query is set to "every 24 hours", the run_time difference between two consecutive queries is exactly 24 hours, even though the actual execution time may vary slightly. See TransferRun.runTime.
run_date	Date string	The date of the run_time parameter in the following format: %Y-%m-%d; for example, 2018-01-01. This format is compatible with ingestion-time partitioned tables.

Templating system

Scheduled queries support runtime parameters in the destination table name with a templating syntax.

Parameter templating syntax

The templating syntax supports basic string templating and time offsetting. Parameters are referenced in the following formats:

• {run_date}
• {run_time[+\-offset]|"time_format"}

Parameter	Purpose
run_date	This parameter is replaced by the date in format YYYYMMDD.
run_time	This parameter supports the following properties: offset Time offset expressed in hours (h), minutes (m), and seconds (s) in that order. Days (d) are not supported. Decimals are allowed, for example: 1.5h. time_format A formatting string. The most common formatting parameters are years (%Y), months (%m), and days (%d). For partitioned tables, YYYYMMDD is the required suffix - this is equivalent to "%Y%m%d". Read more about formatting datetime elements.

Usage notes:

• No whitespace is allowed between run_time, offset, and time format.
• To include literal curly braces in the string, you can escape them as ‘\{‘ and ‘\}’.
• To include literal quotes or a vertical bar in the time_format, such as “YYYY|MM|DD”, you can escape them in the format string as: ‘\”’ or ‘\|’.

Parameter templating examples

These examples demonstrate specifying destination table names with different time formats, and offsetting the run time.

run_time (UTC)	Templated parameter	Output destination table name
2018-02-15 00:00:00	mytable	mytable
2018-02-15 00:00:00	mytable_{run_time|"%Y%m%d"}	mytable_20180215
2018-02-15 00:00:00	mytable_{run_time+25h|"%Y%m%d"}	mytable_20180216
2018-02-15 00:00:00	mytable_{run_time-1h|"%Y%m%d"}	mytable_20180214
2018-02-15 00:00:00	mytable_{run_time+1.5h|"%Y%m%d%H"} or mytable_{run_time+90m|"%Y%m%d%H"}	mytable_2018021501
2018-02-15 00:00:00	{run_time+97s|"%Y%m%d"}_mytable_{run_time+97s|"%H%M%S"}	20180215_mytable_000137

Using a service account

You can set up a scheduled query to authenticate with a service account. A service account is a Google Account associated with your Google Cloud project. The service account can run jobs, such as scheduled queries or batch processing pipelines, with its own service credentials rather than an end user's credentials.

Read more about authenticating with service accounts in Introduction to authentication.

• You can set up the scheduled query with a service account in Setting up a scheduled query, under Advanced options.

• You can update an existing scheduled query with the credentials of a service account with the bq command-line tool. See Updating the credentials of a scheduled query.

• Updating a scheduled query to use service account credentials is not currently supported in the Cloud Console.

Setting up a scheduled query

For a description of the schedule syntax, see Formatting the schedule.

Console

1. Open the BigQuery page in the Cloud Console.

   Go to BigQuery

2. Run the query that you're interested in. When you are satisfied with your results, click Schedule and Create new scheduled query.

   

3. The scheduled query options open in the New scheduled query pane.

4. On the New scheduled query pane:

   • For Name for the scheduled query, enter a name such as My scheduled query. The scheduled query name can be any value that you can identify later if you need to modify the query.

   • (Optional) By default, the query runs every day. You can change the default Schedule options as follows:

     • To change the frequency, change the Repeats option from Daily to the desired frequency. To specify a custom frequency, select Custom, then enter a Cron-like time specification in the Custom schedule field; for example every 3 hours. The shortest allowed period is 15 minutes. See the schedule field under TransferConfig for a description of valid values.
     • To change the start time, select the Select start time option, enter the desired start date and time, and then save.
     • To specify an end time, select the Select end time option, enter the desired end date and time, and then save.
     • To save the query without a schedule, so you can run it on demand at a later time, select On Demand as the Repeats option.

     

5. For a standard SQL SELECT query, provide information about the destination dataset.

   • For Dataset name, choose the appropriate destination dataset.
   • For Table name, enter the name of your destination table.
     • For a DDL or DML query, this option is not shown.

   • For Destination table write preference, choose either WRITE_TRUNCATE to overwrite the destination table or WRITE_APPEND to append data to the table.

     • For a DDL or DML query, this option is not shown.

     

6. (Optional) Advanced options:

   • (Optional) CMEK: If you use customer-managed encryption keys, you can select Customer-managed key under Advanced options. A list of your available CMEKs appears for you to choose from.

   • (Optional) Authenticate with a service account: If you have one or more service accounts associated with your Google Cloud project, you can associate a service account with your scheduled query instead of using your user credentials. Under Scheduled query credential, click the menu to see a list of your available service accounts.

     

7. Additional configurations:

   • (Optional) Check Send email notifications to allow email notifications of transfer run failures.

   • For DDL and DML queries, choose the Processing location or region.

   • (Optional) For Pub/Sub topic, enter your Pub/Sub topic name, for example: projects/myproject/topics/mytopic.

     

8. Click the Schedule button.

bq

There are two ways to schedule a query by using the bq command-line tool. Option 2 lets you schedule the query with more options.

Option 1: Use the bq query command.

To create a scheduled query, add the options destination_table (or target_dataset), --schedule, and --display_name to your bq query command.

bq query \
--display_name=name \
--destination_table=table \
--schedule=interval

Replace the following:

• name. The display name for the scheduled query. The display name can be any value that you can identify later if you need to modify the query.
• table. The destination table for the query results.
  • --target_dataset is an alternative way to name the target dataset for the query results, when used with DDL and DML queries.
  • Use either --destination_table or --target_dataset, but not both.
• interval. When used with bq query, makes a query a recurring scheduled query. A schedule for how often the query should run is required. Examples:
  • --schedule='every 24 hours'
  • --schedule='every 3 hours'

Optional flags:

• --project_id is your project ID. If --project_id isn't specified, the default project is used.

• --replace truncates the destination table and write new results with every run of the scheduled query.

• --append_table appends results to the destination table.

If both `--replace` and `--append_table` aren't specified when scheduling the query, no write preference is set. Depending on the query, an error in subsequent scheduled runs might result.

For example, the following command creates a scheduled query named My Scheduled Query using the simple query SELECT 1 from mydataset.test. The destination table is mytable in the dataset mydataset. The scheduled query is created in the default project:

    bq query \
    --use_legacy_sql=false \
    --destination_table=mydataset.mytable \
    --display_name='My Scheduled Query' \
    --schedule='every 24 hours' \
    --replace=true \
    'SELECT
      1
    FROM
      mydataset.test'

Option 2: Use the bq mk command.

Scheduled queries are a kind of transfer. To schedule a query, you can use the bq command-line tool to make a transfer configuration.

Queries must be in StandardSQL dialect to be scheduled.

Enter the bq mk command and supply the transfer creation flag --transfer_config. The following flags are also required:

• --data_source
• --target_dataset (optional for DDL and DML queries)
• --display_name
• --params

Optional flags:

• --project_id is your project ID. If --project_id isn't specified, the default project is used.

• --schedule is how often you want the query to run. If --schedule isn't specified, the default is 'every 24 hours' based on creation time.

• For DDL and DML queries, you can also supply the --location flag to specify a particular region for processing. If --location isn't specified, the global Google Cloud location is used.

• --service_account_name is for authenticating your scheduled query with a service account instead of your individual user account.

bq mk \
--transfer_config \
--project_id=project_id \
--target_dataset=dataset \
--display_name=name \
--params='parameters' \
--data_source=data_source

Replace the following:

• dataset. The target dataset for the transfer configuration.
  • This parameter is optional for DDL and DML queries. It is required for all other queries.
• name. The display name for the transfer configuration. The display name can be any value that you can identify later if you need to modify the query.
• parameters. Contains the parameters for the created transfer configuration in JSON format. For example: --params='{"param":"param_value"}'.
  • For a scheduled query, you must supply the query parameter.
  • The destination_table_name_template parameter is the name of your destination table.
    • This parameter is optional for DDL and DML queries. It is required for all other queries.
  • For the write_disposition parameter, you can choose WRITE_TRUNCATE to truncate (overwrite) the destination table or WRITE_APPEND to append the query results to the destination table.
    • This parameter is optional for DDL and DML queries. It is required for all other queries.
  • (Optional) The destination_table_kms_key parameter is for customer-managed encryption keys.
  • (Optional) The --service_account_name parameter is for authenticating with a service account instead of an individual user account.
• data_source. The data source: scheduled_query.

Note: To write results to an ingestion-time partitioned table, see the instructions in Destination table. A scheduled query fails if you create a transfer configuration with the destination_table_name_template parameter set to an ingestion-time partitioned table while also supplying an error if setting to an ingestion-time partitioned the partitioning_field parameter.

Note: Currently, you cannot configure notifications using the command-line tool.

For example, the following command creates a scheduled query transfer configuration named My Scheduled Query using the simple query SELECT 1 from mydataset.test. The destination table mytable is truncated for every write, and the target dataset is mydataset. The scheduled query is created in the default project, and authenticates with a service account:

bq mk \
--transfer_config \
--target_dataset=mydataset \
--display_name='My Scheduled Query' \
--params='{"query":"SELECT 1 from mydataset.test","destination_table_name_template":"mytable","write_disposition":"WRITE_TRUNCATE"}' \
--data_source=scheduled_query \
--service_account_name=[e-mail]

The first time you run the command, you receive a message like the following:

[URL omitted] Please copy and paste the above URL into your web browser and follow the instructions to retrieve an authentication code.

Follow the instructions in the message and paste the authentication code on the command line.

API

Use the projects.locations.transferConfigs.create method and supply an instance of the TransferConfig resource.

Java

To learn how to install and use the client library for BigQuery, see BigQuery client libraries. For more information, see the BigQuery Java API reference documentation.

View on GitHub Feedback

import com.google.api.gax.rpc.ApiException;
import com.google.cloud.bigquery.datatransfer.v1.CreateTransferConfigRequest;
import com.google.cloud.bigquery.datatransfer.v1.DataTransferServiceClient;
import com.google.cloud.bigquery.datatransfer.v1.ProjectName;
import com.google.cloud.bigquery.datatransfer.v1.TransferConfig;
import com.google.protobuf.Struct;
import com.google.protobuf.Value;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

// Sample to create a scheduled query
public class CreateScheduledQuery {

  public static void main(String[] args) throws IOException {
    // TODO(developer): Replace these variables before running the sample.
    final String projectId = "MY_PROJECT_ID";
    final String datasetId = "MY_DATASET_ID";
    final String query =
        "SELECT CURRENT_TIMESTAMP() as current_time, @run_time as intended_run_time, "
            + "@run_date as intended_run_date, 17 as some_integer";
    Map<String, Value> params = new HashMap<>();
    params.put("query", Value.newBuilder().setStringValue(query).build());
    params.put(
        "destination_table_name_template",
        Value.newBuilder().setStringValue("my_destination_table_{run_date}").build());
    params.put("write_disposition", Value.newBuilder().setStringValue("WRITE_TRUNCATE").build());
    params.put("partitioning_field", Value.newBuilder().build());
    TransferConfig transferConfig =
        TransferConfig.newBuilder()
            .setDestinationDatasetId(datasetId)
            .setDisplayName("Your Scheduled Query Name")
            .setDataSourceId("scheduled_query")
            .setParams(Struct.newBuilder().putAllFields(params).build())
            .setSchedule("every 24 hours")
            .build();
    createScheduledQuery(projectId, transferConfig);
  }

  public static void createScheduledQuery(String projectId, TransferConfig transferConfig)
      throws IOException {
    try (DataTransferServiceClient dataTransferServiceClient = DataTransferServiceClient.create()) {
      ProjectName parent = ProjectName.of(projectId);
      CreateTransferConfigRequest request =
          CreateTransferConfigRequest.newBuilder()
              .setParent(parent.toString())
              .setTransferConfig(transferConfig)
              .build();
      TransferConfig config = dataTransferServiceClient.createTransferConfig(request);
      System.out.println("\nScheduled query created successfully :" + config.getName());
    } catch (ApiException ex) {
      System.out.print("\nScheduled query was not created." + ex.toString());
    }
  }
}

Python

To learn how to install and use the client library for BigQuery, see BigQuery client libraries. For more information, see the BigQuery Python API reference documentation.

View on GitHub Feedback

from google.cloud import bigquery_datatransfer

transfer_client = bigquery_datatransfer.DataTransferServiceClient()

# The project where the query job runs is the same as the project
# containing the destination dataset.
project_id = "your-project-id"
dataset_id = "your_dataset_id"

# This service account will be used to execute the scheduled queries. Omit
# this request parameter to run the query as the user with the credentials
# associated with this client.
service_account_name = "[e-mail]"

# Use standard SQL syntax for the query.
query_string = """
SELECT
  CURRENT_TIMESTAMP() as current_time,
  @run_time as intended_run_time,
  @run_date as intended_run_date,
  17 as some_integer
"""

parent = transfer_client.common_project_path(project_id)

transfer_config = bigquery_datatransfer.TransferConfig(
    destination_dataset_id=dataset_id,
    display_name="Your Scheduled Query Name",
    data_source_id="scheduled_query",
    params={
        "query": query_string,
        "destination_table_name_template": "your_table_{run_date}",
        "write_disposition": "WRITE_TRUNCATE",
        "partitioning_field": "",
    },
    schedule="every 24 hours",
)

transfer_config = transfer_client.create_transfer_config(
    bigquery_datatransfer.CreateTransferConfigRequest(
        parent=parent,
        transfer_config=transfer_config,
        service_account_name=service_account_name,
    )
)

print("Created scheduled query '{}'".format(transfer_config.name))

Setting up a scheduled query with a service account

Java

To learn how to install and use the client library for BigQuery, see BigQuery client libraries. For more information, see the BigQuery Java API reference documentation.

View on GitHub Feedback

import com.google.api.gax.rpc.ApiException;
import com.google.cloud.bigquery.datatransfer.v1.CreateTransferConfigRequest;
import com.google.cloud.bigquery.datatransfer.v1.DataTransferServiceClient;
import com.google.cloud.bigquery.datatransfer.v1.ProjectName;
import com.google.cloud.bigquery.datatransfer.v1.TransferConfig;
import com.google.protobuf.Struct;
import com.google.protobuf.Value;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

// Sample to create a scheduled query with service account
public class CreateScheduledQueryWithServiceAccount {

  public static void main(String[] args) throws IOException {
    // TODO(developer): Replace these variables before running the sample.
    final String projectId = "MY_PROJECT_ID";
    final String datasetId = "MY_DATASET_ID";
    final String serviceAccount = "MY_SERVICE_ACCOUNT";
    final String query =
        "SELECT CURRENT_TIMESTAMP() as current_time, @run_time as intended_run_time, "
            + "@run_date as intended_run_date, 17 as some_integer";
    Map<String, Value> params = new HashMap<>();
    params.put("query", Value.newBuilder().setStringValue(query).build());
    params.put(
        "destination_table_name_template",
        Value.newBuilder().setStringValue("my_destination_table_{run_date}").build());
    params.put("write_disposition", Value.newBuilder().setStringValue("WRITE_TRUNCATE").build());
    params.put("partitioning_field", Value.newBuilder().build());
    TransferConfig transferConfig =
        TransferConfig.newBuilder()
            .setDestinationDatasetId(datasetId)
            .setDisplayName("Your Scheduled Query Name")
            .setDataSourceId("scheduled_query")
            .setParams(Struct.newBuilder().putAllFields(params).build())
            .setSchedule("every 24 hours")
            .build();
    createScheduledQueryWithServiceAccount(projectId, transferConfig, serviceAccount);
  }

  public static void createScheduledQueryWithServiceAccount(
      String projectId, TransferConfig transferConfig, String serviceAccount) throws IOException {
    try (DataTransferServiceClient dataTransferServiceClient = DataTransferServiceClient.create()) {
      ProjectName parent = ProjectName.of(projectId);
      CreateTransferConfigRequest request =
          CreateTransferConfigRequest.newBuilder()
              .setParent(parent.toString())
              .setTransferConfig(transferConfig)
              .setServiceAccountName(serviceAccount)
              .build();
      TransferConfig config = dataTransferServiceClient.createTransferConfig(request);
      System.out.println(
          "\nScheduled query with service account created successfully :" + config.getName());
    } catch (ApiException ex) {
      System.out.print("\nScheduled query with service account was not created." + ex.toString());
    }
  }
}

Python

To learn how to install and use the client library for BigQuery, see BigQuery client libraries. For more information, see the BigQuery Python API reference documentation.

View on GitHub Feedback

from google.cloud import bigquery_datatransfer

transfer_client = bigquery_datatransfer.DataTransferServiceClient()

# The project where the query job runs is the same as the project
# containing the destination dataset.
project_id = "your-project-id"
dataset_id = "your_dataset_id"

# This service account will be used to execute the scheduled queries. Omit
# this request parameter to run the query as the user with the credentials
# associated with this client.
service_account_name = "[e-mail]"

# Use standard SQL syntax for the query.
query_string = """
SELECT
  CURRENT_TIMESTAMP() as current_time,
  @run_time as intended_run_time,
  @run_date as intended_run_date,
  17 as some_integer
"""

parent = transfer_client.common_project_path(project_id)

transfer_config = bigquery_datatransfer.TransferConfig(
    destination_dataset_id=dataset_id,
    display_name="Your Scheduled Query Name",
    data_source_id="scheduled_query",
    params={
        "query": query_string,
        "destination_table_name_template": "your_table_{run_date}",
        "write_disposition": "WRITE_TRUNCATE",
        "partitioning_field": "",
    },
    schedule="every 24 hours",
)

transfer_config = transfer_client.create_transfer_config(
    bigquery_datatransfer.CreateTransferConfigRequest(
        parent=parent,
        transfer_config=transfer_config,
        service_account_name=service_account_name,
    )
)

print("Created scheduled query '{}'".format(transfer_config.name))

Viewing the status of a scheduled query

Console

To view the status of your scheduled queries, click Scheduled queries in the navigation pane. Refresh the page to see the updated status of your scheduled queries. Click a scheduled query to get more details about it.

bq

Scheduled queries are a kind of transfer. To show the details of a scheduled query, you can first use the bq command-line tool to list your transfer configurations.

Enter the bq ls command and supply the transfer flag --transfer_config. The following flags are also required:

• --transfer_location

For example:

bq ls \
--transfer_config \
--transfer_location=us \

To show the details of a single scheduled query, enter the bq show command and supply the transfer_path for that scheduled query/transfer config.

For example:

bq show \
--transfer_config \
projects/862514376110/locations/us/transferConfigs/5dd12f26-0000-262f-bc38-089e0820fe38 \

API

Use the projects.locations.transferConfigs.list method and supply an instance of the TransferConfig resource.

Java

To learn how to install and use the client library for BigQuery, see BigQuery client libraries. For more information, see the BigQuery Java API reference documentation.

View on GitHub Feedback

import com.google.api.gax.rpc.ApiException;
import com.google.cloud.bigquery.datatransfer.v1.DataTransferServiceClient;
import com.google.cloud.bigquery.datatransfer.v1.ListTransferConfigsRequest;
import com.google.cloud.bigquery.datatransfer.v1.ProjectName;
import java.io.IOException;

// Sample to get list of transfer config
public class ListTransferConfigs {

  public static void main(String[] args) throws IOException {
    // TODO(developer): Replace these variables before running the sample.
    final String projectId = "MY_PROJECT_ID";
    listTransferConfigs(projectId);
  }

  public static void listTransferConfigs(String projectId) throws IOException {
    try (DataTransferServiceClient dataTransferServiceClient = DataTransferServiceClient.create()) {
      ProjectName parent = ProjectName.of(projectId);
      ListTransferConfigsRequest request =
          ListTransferConfigsRequest.newBuilder().setParent(parent.toString()).build();
      dataTransferServiceClient
          .listTransferConfigs(request)
          .iterateAll()
          .forEach(config -> System.out.print("Success! Config ID :" + config.getName() + "\n"));
    } catch (ApiException ex) {
      System.out.println("Config list not found due to error." + ex.toString());
    }
  }
}

Python

To learn how to install and use the client library for BigQuery, see BigQuery client libraries. For more information, see the BigQuery Python API reference documentation.

View on GitHub Feedback

from google.cloud import bigquery_datatransfer

transfer_client = bigquery_datatransfer.DataTransferServiceClient()

project_id = "my-project"
parent = transfer_client.common_project_path(project_id)

configs = transfer_client.list_transfer_configs(parent=parent)
print("Got the following configs:")
for config in configs:
    print(f"\tID: {config.name}, Schedule: {config.schedule}")

Updating a scheduled query

Console

To update a scheduled query, follow these steps:

1. In the navigation pane, click Scheduled queries.
2. In the list of scheduled queries, click on the name of the query that you want to change.
3. On the Scheduled query details page that opens, click Edit.
4. Optional: Change the query text in the query editing pane.
5. Click Schedule query and then select Update scheduled query.
6. Optional: Change any other scheduling options for the query.
7. Click Update.

Updating the credentials of a scheduled query

If you're scheduling an existing query, you might need to update the user credentials on the query. Credentials are automatically up to date for new scheduled queries.

Some other situations that could require updating credentials include the following:

• You wish to query Drive data in a scheduled query.

• You receive an INVALID_USER error when you attempt to schedule the query:

  Error code 5 : Authentication failure: User Id not found. Error code: INVALID_USERID

Console

To refresh the existing credentials on a scheduled query:

1. Find and view the status of a scheduled query.

2. Click the MORE button and select Update credentials.

   

3. Allow 10 to 20 minutes for the change to take effect. You might need to clear your browser's cache.

Caution: Changing the credentials used in a scheduled query to a service account is not currently supported in the Cloud Console.

bq

Scheduled queries are a kind of transfer. To update the credentials of a scheduled query, you can use the bq command-line tool to update the transfer configuration.

Enter the bq update command and supply the transfer flag --transfer_config. The following flags are also required:

• --update_credentials

Optional flag:

• --service_account_name is for authenticating your scheduled query with a service account instead of your individual user account.

For example, the following command updates a scheduled query transfer configuration to authenticate with a service account:

bq update \
--transfer_config \
--update_credentials \
--service_account_name=[e-mail] projects/862514376110/locations/us/transferConfigs/5dd12f26-0000-262f-bc38-089e0820fe38 \

Java

To learn how to install and use the client library for BigQuery, see BigQuery client libraries. For more information, see the BigQuery Java API reference documentation.

View on GitHub Feedback

import com.google.api.gax.rpc.ApiException;
import com.google.cloud.bigquery.datatransfer.v1.DataTransferServiceClient;
import com.google.cloud.bigquery.datatransfer.v1.TransferConfig;
import com.google.cloud.bigquery.datatransfer.v1.UpdateTransferConfigRequest;
import com.google.protobuf.FieldMask;
import com.google.protobuf.util.FieldMaskUtil;
import java.io.IOException;

// Sample to update credentials in transfer config.
public class UpdateCredentials {

  public static void main(String[] args) throws IOException {
    // TODO(developer): Replace these variables before running the sample.
    String configId = "MY_CONFIG_ID";
    String serviceAccount = "MY_SERVICE_ACCOUNT";
    TransferConfig transferConfig = TransferConfig.newBuilder().setName(configId).build();
    FieldMask updateMask = FieldMaskUtil.fromString("service_account_name");
    updateCredentials(transferConfig, serviceAccount, updateMask);
  }

  public static void updateCredentials(
      TransferConfig transferConfig, String serviceAccount, FieldMask updateMask)
      throws IOException {
    try (DataTransferServiceClient dataTransferServiceClient = DataTransferServiceClient.create()) {
      UpdateTransferConfigRequest request =
          UpdateTransferConfigRequest.newBuilder()
              .setTransferConfig(transferConfig)
              .setUpdateMask(updateMask)
              .setServiceAccountName(serviceAccount)
              .build();
      dataTransferServiceClient.updateTransferConfig(request);
      System.out.println("Credentials updated successfully");
    } catch (ApiException ex) {
      System.out.print("Credentials was not updated." + ex.toString());
    }
  }
}

Python

To learn how to install and use the client library for BigQuery, see BigQuery client libraries. For more information, see the BigQuery Python API reference documentation.

View on GitHub Feedback

from google.cloud import bigquery_datatransfer
from google.protobuf import field_mask_pb2

transfer_client = bigquery_datatransfer.DataTransferServiceClient()

service_account_name = "[e-mail]"
transfer_config_name = "projects/1234/locations/us/transferConfigs/abcd"

transfer_config = bigquery_datatransfer.TransferConfig(name=transfer_config_name)

transfer_config = transfer_client.update_transfer_config(
    {
        "transfer_config": transfer_config,
        "update_mask": field_mask_pb2.FieldMask(paths=["service_account_name"]),
        "service_account_name": service_account_name,
    }
)

print("Updated config: '{}'".format(transfer_config.name))

Setting up a manual run on historical dates

In addition to scheduling a query to run in the future, you can also trigger immediate runs manually. Triggering an immediate run would be necessary if your query uses the run_date parameter, and there were issues during a prior run.

For example, every day at 09:00 you query a source table for rows that match the current date. However, you find that data wasn't added to the source table for the last three days. In this situation, you can set the query to run on historical data within a date range that you specify. Your query runs using combinations of run_date and run_time parameters that correspond to the dates you configured in your scheduled query.

After setting up a scheduled query, here's how you can run the query by using a historical date range:

Console

After clicking Schedule to save your scheduled query, you can click the Scheduled queries button to see the list of currently scheduled queries. Click any display name to see the query schedule's details. At the top right of the page, click Schedule backfill to specify a historical date range.

The chosen runtimes are all within your selected range, including the first date and excluding the last date.

The date ranges you provide are in UTC, but your query's schedule is displayed in your local time zone (see Example 2 to work around this issue).

Example 1

Your scheduled query is set to run every day 09:00 Pacific Time. You're missing data from January 1, January 2, and January 3. Choose the following historic date range:

Start Time = 1/1/19
End Time = 1/4/19

Your query runs using run_date and run_time parameters that correspond to the following times:

• 1/1/19 09:00 Pacific Time
• 1/2/19 09:00 Pacific Time
• 1/3/19 09:00 Pacific Time

Example 2

Your scheduled query is set to run every day 23:00 Pacific Time. You're missing data from January 1, January 2, and January 3. Choose the following historic date ranges (later dates are chosen because UTC has a different date at 23:00 Pacific Time):

Start Time = 1/2/19
End Time = 1/5/19

Your query runs using run_date and run_time parameters that correspond to the following times:

• 1/2/19 06:00 UTC, or 1/1/2019 23:00 Pacific Time
• 1/3/19 06:00 UTC, or 1/2/2019 23:00 Pacific Time
• 1/4/19 06:00 UTC, or 1/3/2019 23:00 Pacific Time

After setting up manual runs, refresh the page to see them in the list of runs.

bq

To manually run the query on a historical date range:

Enter the bq mk command and supply the transfer run flag --transfer_run. The following flags are also required:

• --start_time
• --end_time

bq mk \
--transfer_run \
--start_time='start_time' \
--end_time='end_time' \
resource_name

Replace the following:

• start_time and end_time. Timestamps that end in Z or contain a valid time zone offset. Examples:
  • 2017-08-19T12:11:35.00Z
  • 2017-05-25T00:00:00+00:00
• resource_name. The scheduled query's (or transfer's) Resource Name. The Resource Name is also known as the transfer configuration.

For example, the following command schedules a backfill for scheduled query resource (or transfer configuration): projects/myproject/locations/us/transferConfigs/1234a123-1234-1a23-1be9-12ab3c456de7.

  bq mk \
  --transfer_run \
  --start_time 2017-05-25T00:00:00Z \
  --end_time 2017-05-25T00:00:00Z \
  projects/myproject/locations/us/transferConfigs/1234a123-1234-1a23-1be9-12ab3c456de7

For more information, see bq mk --transfer_run.

API

Use the projects.locations.transferConfigs.scheduleRun method and supply a path of the TransferConfig resource.

Java

To learn how to install and use the client library for BigQuery, see BigQuery client libraries. For more information, see the BigQuery Java API reference documentation.

View on GitHub Feedback

import com.google.api.gax.rpc.ApiException;
import com.google.cloud.bigquery.datatransfer.v1.DataTransferServiceClient;
import com.google.cloud.bigquery.datatransfer.v1.ScheduleTransferRunsRequest;
import com.google.cloud.bigquery.datatransfer.v1.ScheduleTransferRunsResponse;
import com.google.protobuf.Timestamp;
import java.io.IOException;
import org.threeten.bp.Clock;
import org.threeten.bp.Instant;
import org.threeten.bp.temporal.ChronoUnit;

// Sample to run schedule back fill for transfer config
public class ScheduleBackFill {

  public static void main(String[] args) throws IOException {
    // TODO(developer): Replace these variables before running the sample.
    String configId = "MY_CONFIG_ID";
    Clock clock = Clock.systemDefaultZone();
    Instant instant = clock.instant();
    Timestamp startTime =
        Timestamp.newBuilder()
            .setSeconds(instant.minus(5, ChronoUnit.DAYS).getEpochSecond())
            .setNanos(instant.minus(5, ChronoUnit.DAYS).getNano())
            .build();
    Timestamp endTime =
        Timestamp.newBuilder()
            .setSeconds(instant.minus(2, ChronoUnit.DAYS).getEpochSecond())
            .setNanos(instant.minus(2, ChronoUnit.DAYS).getNano())
            .build();
    scheduleBackFill(configId, startTime, endTime);
  }

  public static void scheduleBackFill(String configId, Timestamp startTime, Timestamp endTime)
      throws IOException {
    try (DataTransferServiceClient client = DataTransferServiceClient.create()) {
      ScheduleTransferRunsRequest request =
          ScheduleTransferRunsRequest.newBuilder()
              .setParent(configId)
              .setStartTime(startTime)
              .setEndTime(endTime)
              .build();
      ScheduleTransferRunsResponse response = client.scheduleTransferRuns(request);
      System.out.println("Schedule backfill run successfully :" + response.getRunsCount());
    } catch (ApiException ex) {
      System.out.print("Schedule backfill was not run." + ex.toString());
    }
  }
}

Python

To learn how to install and use the client library for BigQuery, see BigQuery client libraries. For more information, see the BigQuery Python API reference documentation.

View on GitHub Feedback

import datetime

from google.cloud import bigquery_datatransfer

transfer_client = bigquery_datatransfer.DataTransferServiceClient()

transfer_config_name = "projects/1234/locations/us/transferConfigs/abcd"
now = datetime.datetime.now(datetime.timezone.utc)
start_time = now - datetime.timedelta(days=5)
end_time = now - datetime.timedelta(days=2)

# Some data sources, such as scheduled_query only support daily run.
# Truncate start_time and end_time to midnight time (00:00AM UTC).
start_time = datetime.datetime(
    start_time.year, start_time.month, start_time.day, tzinfo=datetime.timezone.utc
)
end_time = datetime.datetime(
    end_time.year, end_time.month, end_time.day, tzinfo=datetime.timezone.utc
)

response = transfer_client.schedule_transfer_runs(
    parent=transfer_config_name, start_time=start_time, end_time=end_time,
)

print("Started transfer runs:")
for run in response.runs:
    print(f"backfill: {run.run_time} run: {run.name}")

Deleting a scheduled query

Java

To learn how to install and use the client library for BigQuery, see BigQuery client libraries. For more information, see the BigQuery Java API reference documentation.

View on GitHub Feedback

import com.google.api.gax.rpc.ApiException;
import com.google.cloud.bigquery.datatransfer.v1.DataTransferServiceClient;
import com.google.cloud.bigquery.datatransfer.v1.DeleteTransferConfigRequest;
import java.io.IOException;

// Sample to delete a transfer config
public class DeleteTransferConfig {

  public static void main(String[] args) throws IOException {
    // TODO(developer): Replace these variables before running the sample.
    // i.e projects/{project_id}/transferConfigs/{config_id}` or
    // `projects/{project_id}/locations/{location_id}/transferConfigs/{config_id}`
    String configId = "MY_CONFIG_ID";
    deleteTransferConfig(configId);
  }

  public static void deleteTransferConfig(String configId) throws IOException {
    try (DataTransferServiceClient dataTransferServiceClient = DataTransferServiceClient.create()) {
      DeleteTransferConfigRequest request =
          DeleteTransferConfigRequest.newBuilder().setName(configId).build();
      dataTransferServiceClient.deleteTransferConfig(request);
      System.out.println("Transfer config deleted successfully");
    } catch (ApiException ex) {
      System.out.println("Transfer config was not deleted." + ex.toString());
    }
  }
}

Python

To learn how to install and use the client library for BigQuery, see BigQuery client libraries. For more information, see the BigQuery Python API reference documentation.

View on GitHub Feedback

import google.api_core.exceptions
from google.cloud import bigquery_datatransfer

transfer_client = bigquery_datatransfer.DataTransferServiceClient()

transfer_config_name = "projects/1234/locations/us/transferConfigs/abcd"
try:
    transfer_client.delete_transfer_config(name=transfer_config_name)
except google.api_core.exceptions.NotFound:
    print("Transfer config not found.")
else:
    print(f"Deleted transfer config: {transfer_config_name}")

Quotas

Scheduled queries are executed with the creator's credentials and project, as if you were executing the query yourself.

Although scheduled queries use features of BigQuery Data Transfer Service, they are not transfers and are not subject to the load jobs quota. Scheduled queries are subject to the same BigQuery quotas and limits as manual queries.

Pricing

Scheduled queries are priced the same as manual BigQuery queries.

Supported regions

Caution: Cross-region queries are not supported. The destination table for your scheduled query must be in the same region as the data being queried.

Scheduled queries are supported in the following locations.

Regional locations

	Region description	Region name
Americas
	Iowa	us-central1
	Las Vegas	us-west4
	Los Angeles	us-west2
	Montréal	northamerica-northeast1
	Northern Virginia	us-east4
	Oregon	us-west1
	Salt Lake City	us-west3
	São Paulo	southamerica-east1
	South Carolina	us-east1
Europe
	Belgium	europe-west1
	Finland	europe-north1
	Frankfurt	europe-west3
	London	europe-west2
	Netherlands	europe-west4
	Warsaw	europe-central2
	Zürich	europe-west6
Asia Pacific
	Delhi	asia-south2
	Hong Kong	asia-east2
	Jakarta	asia-southeast2
	Melbourne	australia-southeast2
	Mumbai	asia-south1
	Osaka	asia-northeast2
	Seoul	asia-northeast3
	Singapore	asia-southeast1
	Sydney	australia-southeast1
	Taiwan	asia-east1
	Tokyo	asia-northeast1

Multi-regional locations

Multi-region description	Multi-region name
Data centers within member states of the European Union^1	EU
Data centers in the United States	US

¹ Data located in the EU multi-region is not stored in the europe-west2 (London) or europe-west6 (Zürich) data centers.

What's next?

• For an example of a scheduled query that uses a service account and includes the @run_date and @run_time parameters, see Creating table snapshots with a scheduled query.