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: LargeListViews-detail.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
SiteId
Unique identifier of the impacted site collection.
SiteURL
URL to the impacted site collection.
SiteOwner
Owner of the site collection.
SiteAdmins
List of people listed as site collection administrators.
SiteSizeInMB
Size of the size collection in megabytes [MB]
NumOfWebs
Number of webs that exist in the site collection.
ContentDBName
Name of the content database hosting the site collection.
ContentDBServerName
SQL Server hosting the content database.
ContentDBSizeInMB
Size of the content database hosting the site collection.
LastContentModifiedDate
Date/Time the site collection had content modified.
TotalItemCount
Total number of items found in the site collection.
Hits
Number of requests logged for the site collection. Relies on data from the usage logging service. If the usage logging service is disabled this row will show N/A.
DistinctUsers
Number of distinct users that have accessed the site collection. Relies on data from the usage logging service. If the usage logging service is disabled this row will show N/A.
DaysOfUsageData
Number of days the usage logging service retains data. This provides context for Hits and DistinctUsers. For example, if this is 14 days, the Hits and DistinctUsers data is for the last 14 days.
LookupColumnCount
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.
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.
ListTemplate
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.
ScanID
Unique identifier assigned to a specific execution of the SharePoint Migration Assessment Tool.