WRITE_API_TIMELINE view

The INFORMATION_SCHEMA.WRITE_API_TIMELINE view contains per minute aggregated BigQuery Storage Write API ingestion statistics for the current project.

You can query the INFORMATION_SCHEMA Write API views to retrieve historical and real-time information about data ingestion into BigQuery that uses the BigQuery Storage Write API. See BigQuery Storage Write API for more information.

Required permission

To query the INFORMATION_SCHEMA.WRITE_API_TIMELINE view, you need the bigquery.tables.list Identity and Access Management (IAM) permission for the project.

Each of the following predefined IAM roles includes the required permission:

• roles/bigquery.user
• roles/bigquery.dataViewer
• roles/bigquery.dataEditor
• roles/bigquery.dataOwner
• roles/bigquery.metadataViewer
• roles/bigquery.resourceAdmin
• roles/bigquery.admin

Caution: The required `bigquery.tables.list` permission is not included in the basic roles Owner or Editor.

For more information about BigQuery permissions, see Access control with IAM.

Schema

When you query the INFORMATION_SCHEMA BigQuery Storage Write API views, the query results contain historical and real-time information about data ingestion into BigQuery using the BigQuery Storage Write API. Each row in the following views represents statistics for ingestion into a specific table, aggregated over a one minute interval starting at start_timestamp. Statistics are grouped by stream type and error code, so there will be one row for each stream type and each encountered error code during the one minute interval for each timestamp and table combination. Successful requests have the error code set to OK. If no data was ingested into a table during a certain time period, then no rows are present for the corresponding timestamps for that table.

The INFORMATION_SCHEMA.WRITE_API_TIMELINE_BY_* views have the following schema:

Column name	Data type	Value
start_timestamp	TIMESTAMP	(Partitioning column) Start timestamp of the 1 minute interval for the aggregated statistics.
project_id	STRING	(Clustering column) ID of the project.
project_number	INTEGER	Number of the project.
dataset_id	STRING	(Clustering column) ID of the dataset.
table_id	STRING	(Clustering column) ID of the table.
stream_type	STRING	The stream type used for the data ingestion with BigQuery Storage Write API. It is supposed to be one of "DEFAULT", "COMMITTED", "BUFFERED", or "PENDING".
error_code	STRING	Error code returned for the requests specified by this row. "OK" for successful requests.
total_requests	INTEGER	Total number of requests within the 1 minute interval.
total_rows	INTEGER	Total number of rows from all requests within the 1 minute interval.
total_input_bytes	INTEGER	Total number of bytes from all rows within the 1 minute interval.

Data retention

This view contains the BigQuery Storage Write API ingestion history of the past 180 days.

Scope and syntax

Queries against this view must include a region qualifier. If you do not specify a regional qualifier, metadata is retrieved from all regions. The following table explains the region scope for this view:

View name	Resource scope	Region scope
[PROJECT_ID.]`region-REGION`.INFORMATION_SCHEMA.WRITE_API_TIMELINE[_BY_PROJECT]	Project level	REGION

Replace the following:

• Optional: PROJECT_ID: the ID of your Google Cloud project. If not specified, the default project is used.

• REGION: any dataset region name. For example, `region-us`.

Note: You must use a region qualifier to query INFORMATION_SCHEMA views. The location of the query execution must match the region of the INFORMATION_SCHEMA view.

Example

• To query data in the US multi-region, use `region-us`.INFORMATION_SCHEMA.WRITE_API_TIMELINE_BY_PROJECT
• To query data in the EU multi-region, use `region-eu`.INFORMATION_SCHEMA.WRITE_API_TIMELINE_BY_PROJECT
• To query data in the asia-northeast1 region, use `region-asia-northeast1`.INFORMATION_SCHEMA.WRITE_API_TIMELINE_BY_PROJECT

For a list of available regions, see Dataset locations.

Examples

Example 1: Recent BigQuery Storage Write API ingestion failures

The following example calculates the per minute breakdown of total failed requests for all tables in the project in the last 30 minutes, split by stream type and error code:

SELECT
  start_timestamp,
  stream_type,
  error_code,
  SUM(total_requests) AS num_failed_requests
FROM
  `region-us`.INFORMATION_SCHEMA.WRITE_API_TIMELINE
WHERE
  error_code != 'OK'
  AND start_timestamp > TIMESTAMP_SUB(CURRENT_TIMESTAMP, INTERVAL 30 MINUTE)
GROUP BY
  start_timestamp,
  stream_type,
  error_code
ORDER BY
  start_timestamp DESC;

Note: INFORMATION_SCHEMA view names are case-sensitive.

The result is similar to the following:

+---------------------+-------------+------------------+---------------------+
|   start_timestamp   | stream_type |    error_code    | num_failed_requests |
+---------------------+-------------+------------------+---------------------+
| 2023-02-24 00:25:00 | PENDING     | NOT_FOUND        |                   5 |
| 2023-02-24 00:25:00 | DEFAULT     | INVALID_ARGUMENT |                   1 |
| 2023-02-24 00:25:00 | DEFAULT     | DEADLINE_EXCEEDED|                   4 |
| 2023-02-24 00:24:00 | PENDING     | INTERNAL         |                   3 |
| 2023-02-24 00:24:00 | DEFAULT     | INVALID_ARGUMENT |                   1 |
| 2023-02-24 00:24:00 | DEFAULT     | DEADLINE_EXCEEDED|                   2 |
+---------------------+-------------+------------------+---------------------+

Example 2: Per minute breakdown for all requests with error codes

The following example calculates a per minute breakdown of successful and failed append requests, split into error code categories. This query could be used to populate a dashboard.

SELECT
  start_timestamp,
  SUM(total_requests) AS total_requests,
  SUM(total_rows) AS total_rows,
  SUM(total_input_bytes) AS total_input_bytes,
  SUM(
    IF(
      error_code IN (
        'INVALID_ARGUMENT', 'NOT_FOUND', 'CANCELLED', 'RESOURCE_EXHAUSTED',
        'ALREADY_EXISTS', 'PERMISSION_DENIED', 'UNAUTHENTICATED',
        'FAILED_PRECONDITION', 'OUT_OF_RANGE'),
      total_requests,
      0)) AS user_error,
  SUM(
    IF(
      error_code IN (
        'DEADLINE_EXCEEDED','ABORTED', 'INTERNAL', 'UNAVAILABLE',
        'DATA_LOSS', 'UNKNOWN'),
      total_requests,
      0)) AS server_error,
  SUM(IF(error_code = 'OK', 0, total_requests)) AS total_error,
FROM
  `region-us`.INFORMATION_SCHEMA.WRITE_API_TIMELINE
GROUP BY
  start_timestamp
ORDER BY
  start_timestamp DESC;

Note: INFORMATION_SCHEMA view names are case-sensitive.

The result is similar to the following:

+---------------------+----------------+------------+-------------------+------------+--------------+-------------+
|   start_timestamp   | total_requests | total_rows | total_input_bytes | user_error | server_error | total_error |
+---------------------+----------------+------------+-------------------+------------+--------------+-------------+
| 2020-04-15 22:00:00 |         441854 |     441854 |       23784853118 |          0 |           17 |          17 |
| 2020-04-15 21:59:00 |         355627 |     355627 |       26101982742 |          8 |            0 |          13 |
| 2020-04-15 21:58:00 |         354603 |     354603 |       26160565341 |          0 |            0 |           0 |
| 2020-04-15 21:57:00 |         298823 |     298823 |       23877821442 |          2 |            0 |           2 |
+---------------------+----------------+------------+-------------------+------------+--------------+-------------+

Example 3: Tables with the most incoming traffic

The following example returns the BigQuery Storage Write API ingestion statistics for the 10 tables with the most incoming traffic:

SELECT
  project_id,
  dataset_id,
  table_id,
  SUM(total_rows) AS num_rows,
  SUM(total_input_bytes) AS num_bytes,
  SUM(total_requests) AS num_requests
FROM
  `region-us`.INFORMATION_SCHEMA.WRITE_API_TIMELINE_BY_PROJECT
GROUP BY
  project_id,
  dataset_id,
  table_id
ORDER BY
  num_bytes DESC
LIMIT 10;

Note: INFORMATION_SCHEMA view names are case-sensitive.

The result is similar to the following:

+----------------------+------------+-------------------------------+------------+----------------+--------------+
|      project_id      | dataset_id |           table_id            |  num_rows  |   num_bytes    | num_requests |
+----------------------+------------+-------------------------------+------------+----------------+--------------+
| my-project           | dataset1   | table1                        | 8016725532 | 73787301876979 |   8016725532 |
| my-project           | dataset1   | table2                        |   26319580 | 34199853725409 |     26319580 |
| my-project           | dataset2   | table1                        |   38355294 | 22879180658120 |     38355294 |
| my-project           | dataset1   | table3                        |  270126906 | 17594235226765 |    270126906 |
| my-project           | dataset2   | table2                        |   95511309 | 17376036299631 |     95511309 |
| my-project           | dataset2   | table3                        |   46500443 | 12834920497777 |     46500443 |
| my-project           | dataset2   | table4                        |   25846270 |  7487917957360 |     25846270 |
| my-project           | dataset1   | table4                        |   18318404 |  5665113765882 |     18318404 |
| my-project           | dataset1   | table5                        |   42829431 |  5343969665771 |     42829431 |
| my-project           | dataset1   | table6                        |    8771021 |  5119004622353 |      8771021 |
+----------------------+------------+-------------------------------+------------+----------------+--------------+

Example 4: BigQuery Storage Write API ingestion error ratio for a table

The following example calculates a per-day breakdown of errors for a specific table, split by error code:

SELECT
  TIMESTAMP_TRUNC(start_timestamp, DAY) as day,
  project_id,
  dataset_id,
  table_id,
  error_code,
  SUM(total_rows) AS num_rows,
  SUM(total_input_bytes) AS num_bytes,
  SUM(total_requests) AS num_requests
FROM
  `region-us`.INFORMATION_SCHEMA.WRITE_API_TIMELINE_BY_PROJECT
WHERE
  table_id LIKE 'my_table'
GROUP BY
  project_id, dataset_id, table_id, error_code, day
ORDER BY
  day, project_id, dataset_id DESC;

Note: INFORMATION_SCHEMA view names are case-sensitive.

The result is similar to the following:

+---------------------+-------------+------------+----------+----------------+----------+-----------+--------------+
|         day         |  project_id | dataset_id | table_id |   error_code   | num_rows | num_bytes | num_requests |
+---------------------+-------------+------------+----------+----------------+----------+-----------+--------------+
| 2020-04-21 00:00:00 | my_project  | my_dataset | my_table | OK             |       41 |    252893 |           41 |
| 2020-04-20 00:00:00 | my_project  | my_dataset | my_table | OK             |     2798 |  10688286 |         2798 |
| 2020-04-19 00:00:00 | my_project  | my_dataset | my_table | OK             |     2005 |   7979495 |         2005 |
| 2020-04-18 00:00:00 | my_project  | my_dataset | my_table | OK             |     2054 |   7972378 |         2054 |
| 2020-04-17 00:00:00 | my_project  | my_dataset | my_table | OK             |     2056 |   6978079 |         2056 |
| 2020-04-17 00:00:00 | my_project  | my_dataset | my_table | INTERNAL       |        4 |     10825 |            4 |
+---------------------+-------------+------------+----------+----------------+----------+-----------+--------------+