In the sharepoint 2010 capacity planning document there is a supported limit of 250000 sites per sitecollection. There is however the following note in the document for this limit:
Deleting or creating a site or subsite can significantly affect a site’s availability. Access to the site and subsites will be limited while the site is being deleted. Attempting to create many subsites at the same time may also fail.
How do I need to interpret this? Assuming the structure sitecol/mainsite/subsite1 ... sitecol/mainsite/subsite200000. If I delete say subsite1, or create subsite200001. Will this impact the availability of the entire sitecollection? The availability of the mainsite? Or availability of other subsites?
PS: I know this structure renders the all sites view for the mainsite useless and should not be used. This is acceptable for this scenario.