SharePoint 2019 Search: Crawl failed
When experiencing the error: Make sure to add a robots.txt to each WebApp's Virtual Directory. E.g. the default path to one one the WebApps: robots.txt content:
If you are experiencing slow OLAP Cube Builds after, for example, a migration to new Hardware and OS – consider to check and change the following settings.
These have also been mentioned in a Post by Brian Smith.
In order to enable the SQL Server query optimizer hotfix you have to enable the trace flag 4199. (I am talking about SQL Server 2008 R2 SP3, Version: 10.50.6000.34)
To do so: