Outdated Version
You are viewing an older version of this section. View current production version.
SLEEP
Halts execution of the thread for the given number of seconds.
Syntax
SLEEP ( seconds )
Arguments
- seconds: the number of seconds (or fraction) to sleep the thread.
Return type
Returns an integer. Specifically, SLEEP() returns the number 0 if it returns normally without interruption. If the query that is being halted is killed or times out, SLEEP() returns the number 1.
Examples
This function is useful mainly for debugging and measurement purposes, e.g., to make sure a list of queries runs at certain intervals.
select now(); select sleep(10); select now();
+---------------------+
| now() |
+---------------------+
| 2015-03-02 23:22:25 |
+---------------------+
+-----------+
| sleep(10) |
+-----------+
| 0 |
+-----------+
+---------------------+
| now() |
+---------------------+
| 2015-03-02 23:22:35 |
+---------------------+
