Syntax
------

SLEEP(duration)

Description
-----------

Sleeps (pauses) for the number of seconds given by the duration argument, then
returns 0. If SLEEP() is interrupted, it returns 1. The duration may have a
fractional part given in microseconds.

Statements using the SLEEP() function are not safe for replication.

Example
-------

SELECT SLEEP(5.5);
+------------+
| SLEEP(5.5) |
+------------+
|          0 |
+------------+
1 row in set (5.50 sec)

URL: https://mariadb.com/kb/en/sleep/