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Is MySQL's SLEEP() function a busy-wait? How to implement it?
No, MySQL sleep function is not busy-wait. Let us first create a table and implement the SLEEP() function −
mysql> create table DemoTable(FirstName varchar(100)); Query OK, 0 rows affected (0.57 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable values('John');
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable values('Adam');
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable values('Bob');
Query OK, 1 row affected (0.19 sec)
mysql> insert into DemoTable values('Chris');
Query OK, 1 row affected (0.13 sec)
mysql> insert into DemoTable values('Robert');
Query OK, 1 row affected (0.16 sec)Display all records from the table using select statement. We have also set the SLEEP() function here −
mysql> select sleep(10),FirstName from DemoTable;
This will produce the following output −
+-----------+-----------+ | sleep(10) | FirstName | +-----------+-----------+ | 0 | John | | 0 | Adam | | 0 | Bob | | 0 | Chris | | 0 | Robert | +-----------+-----------+ 5 rows in set (50.00 sec)
Updated on: 22-Aug-2019
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