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TABLE_STORAGE view

The INFORMATION_SCHEMA.TABLE_STORAGE view provides a current snapshot of storage usage for tables and materialized views. When you query the INFORMATION_SCHEMA.TABLE_STORAGE view, the query results contain one row for each table or materialized view for the current project. The data in this table is not kept in real time, and might be delayed by a few seconds to a few minutes.

The table storage views give you a convenient way to observe your current and historical storage consumption, and in addition provide details on whether your storage uses logical uncompressed bytes, physical compressed bytes, or maintenance bytes. This information can help you with tasks like planning for future growth and understanding the update patterns for tables.

The *_BYTES columns in the table storage views include information about your use of storage bytes. This information is determined by looking at your storage usage for materialized views and the following types of tables:

Data stored in the query results cache is not billed to you and so is not included in the *_BYTES column values.

Storage usage by clones and snapshots is billed, but information about clones and snapshots isn't included in the table storage views.

Required permissions

To query the INFORMATION_SCHEMA.TABLE_STORAGE view, you need the following Identity and Access Management (IAM) permissions:

  • bigquery.tables.get
  • bigquery.tables.list

Each of the following predefined IAM roles includes the preceding permissions:

  • roles/bigquery.admin
  • roles/bigquery.dataViewer
  • roles/bigquery.dataEditor
  • roles/bigquery.metadataViewer

For queries with a dataset qualifier, you must have permissions for the dataset. For queries with a region qualifier, you must have permissions for the project.

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

Schema

The INFORMATION_SCHEMA.TABLE_STORAGE view has the following schema:

Column name Data type Value
PROJECT_ID STRING The project ID of the project that contains the dataset
PROJECT_NUMBER INT64 The project number of the project that contains the dataset
TABLE_SCHEMA STRING The name of the dataset that contains the table or materialized view, also referred to as the datasetId
TABLE_NAME STRING The name of the table or materialized view, also referred to as the tableId
CREATION_TIME TIMESTAMP The table's creation time
TOTAL_ROWS INT64 The total number of rows in the table or materialized view
TOTAL_PARTITIONS INT64 The number of partitions present in the table or materialized view. Unpartitioned tables return 0.
TOTAL_LOGICAL_BYTES INT64 Total number of logical (uncompressed) bytes in the table or materialized view
ACTIVE_LOGICAL_BYTES INT64 Number of logical (uncompressed) bytes that are less than 90 days old
LONG_TERM_LOGICAL_BYTES INT64 Number of logical (uncompressed) bytes that are more than 90 days old
TOTAL_PHYSICAL_BYTES INT64 Total number of physical (compressed) bytes used for storage, including active, long term, and time travel (for deleted tables) bytes
ACTIVE_PHYSICAL_BYTES INT64 Number of physical (compressed) bytes less than 90 days old
LONG_TERM_PHYSICAL_BYTES INT64 Number of physical (compressed) bytes more than 90 days old
TIME_TRAVEL_PHYSICAL_BYTES INT64 Number of physical (compressed) bytes used by time travel storage (deleted or changed data)

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.TABLE_STORAGE[_BY_PROJECT] Project level REGION
Replace the following:

  • Optional: PROJECT_ID: the ID of your Cloud project. If not specified, the default project is used.
  • REGION: any dataset region name. For example, region-us.
SELECT
  CONCAT(v1.table_catalog, ":", v1.table_schema, ".", v1.table_name) AS unmodified_table_name,
FROM
  `region-REGION`.INFORMATION_SCHEMA.TABLES v1
LEFT JOIN `region-REGION`.INFORMATION_SCHEMA.TABLE_STORAGE v2 ON v1.table_name = v2.table_name
WHERE v2.table_name IS NULL;

The following example show how to return storage information for tables in a specified project:

SELECT * FROM myProject.`region-REGION`.INFORMATION_SCHEMA.TABLE_STORAGE;

The following example show how to return storage information for tables in a specified region:

SELECT * FROM `region-REGION`.INFORMATION_SCHEMA.TABLE_STORAGE_BY_PROJECT;

Example

The following example shows you the total logical bytes billed for the current project.

SELECT
  SUM(total_logical_bytes) AS total_logical_bytes
FROM
  `region-REGION`.INFORMATION_SCHEMA.TABLE_STORAGE;

The result is similar to the following:

+---------------------+---------------------+
|     project_id      | total_logical_bytes |
+---------------------+---------------------+
| projecta            |     971329178274633 |
+---------------------+---------------------+