I've been struggling with this one fetchxml report for Dynamics CRM online.
The report is using aggregate to detect duplications based on certain fields. So, even though it is an aggregate report, the data set will return a lot of rows. Then I found out that the number of rows returned for aggregate fetchxml is limited to 5000.
I understand that normal fetchxml report will return records more than 5000 but for aggregate report, this doesn't seem to be the case. In the resultset, the 'morerecords' attribute shows as '0' too.
Is there any workaround for this (except to use normal fetchxml to get raw data and handle duplicate check somehow in SSRS because there are charts involved..). Or am I forced to report this to Microsoft so that they can write it off as "By design".
The Fetch Aggregate Limit is actually by default 50,000 rows. It specifies the maximum number of records that can be aggregated. 5,000 is the Query Result Limit which defines the maximum size of a page of data that can be retrieved using the organization service.
On CRM Online you are not allowed to relax these limits, but on OnPremise deployments you can. The deployment service supports an UpdateAdvancedSettingsRequest for this purpose. (More details on MSDN.)
A nice overview of CRM 2011 Timeouts and Limits can be found on TechNet. Most of the information given there also applies to later versions of Dynamics CRM.
来源：https://stackoverflow.com/questions/34783871/fetch-xml-report-aggregate-undocumented-limit