SQL_NO_CACHE does not work

Question

The first time I run this sql, needs 39 seconds,when I run again and increase SQL_NO_CACHE,does not seem to take effect:

mysql> select count(*) from `deal         


        

Answer 1

The first query should use SQL_NO_CACHE to tell MySQL not to put the result into the cache. The second query uses the cache and the tells MySQL not to cache the result of that query, which does nothing.

tl;dr - Reverse your queries.