BENCHMARK(count,expr)
The BENCHMARK() function executes the expression expr
repeatedly count
times. It may be used to time how quickly MariaDB processes the expression. The result value is always 0. The intended use is from within the mysql client, which reports query execution times.
SELECT BENCHMARK(1000000,ENCODE('hello','goodbye')); +----------------------------------------------+ | BENCHMARK(1000000,ENCODE('hello','goodbye')) | +----------------------------------------------+ | 0 | +----------------------------------------------+ 1 row in set (0.21 sec)
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https://mariadb.com/kb/en/benchmark/