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 on the project. Each of the following predefined IAM roles includes the required permission:

BigQuery Resource Admin (roles/bigquery.resourceAdmin)
BigQuery Resource Editor (roles/bigquery.resourceEditor)
BigQuery Resource Viewer (roles/bigquery.resourceViewer)
BigQuery User (roles/bigquery.user)
BigQuery Admin (roles/bigquery.admin)

For more information about BigQuery permissions, see BigQuery IAM roles and permissions.

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.
`primary_location`	`STRING`	The current location of the reservation's primary replica. This field is only set for reservations using the managed disaster recovery feature.
`secondary_location`	`STRING`	The current location of the reservation's secondary replica. This field is only set for reservations using the managed disaster recovery feature.
`original_primary_location`	`STRING`	The location where the reservation was originally created.
`labels`	`RECORD`	Array of labels associated with the reservation.
`max_slots`	`INTEGER`	The maximum number of slots that this reservation can use, which includes baseline slots (`slot_capacity`), idle slots (if `ignore_idle_slots` is false), and autoscale slots. This field is specified by users for using the reservation predictability feature.
`scaling_mode`	`STRING`	The scaling mode for the reservation, which determines how the reservation scales from baseline to `max_slots`. This field is specified by users for using the reservation predictability feature.

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;