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“It is better to use UNIQUEIDENTIFIER type in tables when you use database mirroring” – is it myth?
What may be a reason to use unique primary key for mirroring purpose (single database mirroring case)?
No reason at all.
In mirroring only one database is in-use so there are no collision issues.
Is someone confusing this with replication where several sites are in-use and synch to each other? uniqueidentifier has a use here (and is mandatory in some cases) but still not as clustered index. And you use NOT FOR REPLICATION clauses on triggers and IDENTITY etc