RESERVATION_CHANGES view

The INFORMATION_SCHEMA.RESERVATION_CHANGES view contains a near real-time list of all changes to reservations within the administration project. Each row represents a change to a single reservation. For more information, see Introduction to reservations.

Required permission

To query the INFORMATION_SCHEMA.RESERVATION_CHANGES view, you need the bigquery.reservations.list Identity and Access Management (IAM) permission. Each of the following predefined IAM roles includes the required permission:

• roles/bigquery.resourceAdmin
• roles/bigquery.resourceEditor
• roles/bigquery.resourceViewer
• roles/bigquery.user
• roles/bigquery.admin

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

Schema

The INFORMATION_SCHEMA.RESERVATION_CHANGES view has the following schema:

Column name	Data type	Value
change_timestamp	TIMESTAMP	Time when the change occurred.
project_id	STRING	ID of the administration project.
project_number	INTEGER	Number of the administration project.
reservation_name	STRING	User provided reservation name.
ignore_idle_slots	BOOL	If false, any query using this reservation can use unused idle slots from other capacity commitments.
action	STRING	Type of event that occurred with the reservation. Can be CREATE, UPDATE, or DELETE.
slot_capacity	INTEGER	Baseline of the reservation.
user_email	STRING	Email address of the user or subject of the workforce identity federation that made the change. google for changes made by Google. NULL if the email address is unknown.
target_job_concurrency	INTEGER	The target number of queries that can execute simultaneously, which is limited by available resources. If zero, then this value is computed automatically based on available resources.
autoscale	STRUCT	Information about the autoscale capacity of the reservation. Fields include the following: current_slots: the number of slots added to the reservation by autoscaling. Note: After users reduce max_slots, it may take a while before it can be propagated, so current_slots may stay in the original value and could be larger than max_slots for that brief period (less than one minute). max_slots: the maximum number of slots that could be added to the reservation by autoscaling.
edition	STRING	The edition associated with this reservation. For more information about editions, see Introduction to BigQuery editions.

Data retention

This view contains current reservations and deleted reservations that are kept for a maximum of 41 days after which they are removed from the view.

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.RESERVATION_CHANGES[_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

The following example gets the history of changes for a given reservation. Use this information to see the list of changes made to a specific reservation, such as creating or deleting the reservation.

SELECT
  *
FROM
  `reservation-admin-project.region-us`.
  INFORMATION_SCHEMA.RESERVATION_CHANGES
WHERE
  reservation_name = "my-reservation"
ORDER BY
  change_timestamp DESC;