Capacity Management - SharePoint Web Analytics service limits

Limit	Maximum value	Limit type	Notes
SharePoint entities	30,000 per farm when Web Analytics is enabled	Supported	Do not enable Web Analytics if your farm contains, or is expected to contain, more than 30,000 SharePoint entities, which include all Web applications, site collections, and sites. This number is not exact, because different combinations of SharePoint entities might have a greater or lesser effect on farm performance than the tested scenario,  However, as the number of SharePoint entities in your farm closely approaches this limit, farm performance might fall to unacceptable levels.