Hello,

I found the query cache in MariaDB to be super useful and especially powerful 
when used in DEMAND mode. So I'd like to learn more about the performance 
characteristics.

The documentation says that for the query cache, "the mutex is hit even for 
SQL_NO_CACHE":

https://mariadb.com/kb/en/mariadb-memory-allocation/#query-cache

Is there some more information about this somewhere?

Why would a SELECT query that uses this directive dabble with the mutex at all?
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