Migration Assessment Scan: Large List Views

Learn how to mitigate issues with Large List Views during migration.

Overview

On the source environment it is possible to configure list view throttling so there are a set number of hours per day where the throttle on views is lifted. On the target platform, the stated product list limits is in place continuously (24x7). This may result in some of your list views being throttled.

Data Migration

The lists and their data will be migrated. However, the list views called out in the scan report may not be viewable post migration without performing the remediation documented in the following section, Preparing for Migration. Any list views containing over 12 lookup columns may also be throttled and require remediation. For more information, see Designing large lists and maximizing list performance..

Important: Any site that is configured as “No Access” (locked), in SharePoint will be skipped. To see a list of locked site collections see the Locked Sites scan output.

Preparing for Migration

Review the provided report and remediate the large list views prior to migration. For information on how to optimize list views, see Manage large lists and libraries in Office 365.

Post Migration

Ensure the lists that you remediated are rendering correctly.

Scan Result Reports

FileName: LargeLists.csv    This scan report contains list views that were either throttled, or will potentially be throttled in the near future once you migrate to the new platform. The report contains list views that meet one of the following criteria:

  • Returned greater than 3,000 items.

  • Actively throttled on the scanned environment.

  • Contains greater than 12 lookup columns.

  • Configured as an aggregate view.

Column

Description

SiteURL

URL to the site collection that contains the list view.

SiteAdmin

Site collection owner.

WebURL

Url to the subsite that contains the list view.

ListTitle

Title of the list the list view is associated with

ListURL

Url to the root folder of the list.

ListItemCount

Number of items in the list.

LookupField Count

Count of lookup fields that are configured on the list. Any view with more than 12 lookup fields will be throttled on the target environment.

List Template

Template used when creating the list.

ListType

The type of list configured.

ListCreator

User that created the list.

ItemLastModifiedDate

Date/Time an item was last modified on the list.

ListViewTitle

The title of the impacted list view.

DefaultView

True/False. Determines if the view is the default view for the list.

AggregateView

True/False. Determines if the view is an aggregate view. For example, the view is configured to display a Total.

ListViewThrottled

True/False. Specifies whether the list view was actively throttled on the scanned environment.

ViewItemCount

Number of items returned when the list view was executed. This field is empty if ListViewThrottled is True.

Hidden

True/False. Specifies if the list view is configured to be hidden from end users.

ReadOnlyView

True/False. Specifies if the list view is configured to be read only.

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