Execute an expression repeatedly. This function runs a scalar expression a specified number of times, primarily for measuring query execution speed.
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 , which reports query execution times.
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SELECT BENCHMARK(1000000,ENCODE('hello','goodbye'));
+----------------------------------------------+
| BENCHMARK(1000000,ENCODE('hello','goodbye')) |
+----------------------------------------------+
| 0 |
+----------------------------------------------+
1 row in set (0.21 sec)