Thank you for the response.
The reason we choose multiple web collections instead of multiple profiles, We got the issue in crawling all 100+ domains. It's not crawling all the web documents from 100+ domains. So we create one collection for one domain and it's crawling all web documents in a domain.
Is it possible to crawl by profile instead of a collection.? I know the profile is in meta collection and domain added in the component collection. We want to crawl domain by domain.
We have 100+ domains with 100K+ web documents in web collection. So when we add a new domain in a web collection and re-start crawling this takes more than a day to finish crawling. This case will not work for us. So we start this multi collection methodology.
Are you sure we could not add 64+ component collections?