SLEEP() - Holding Statement Execution

Q

How to hold the statement execution for some time using the SLEEP() function?

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A

SLEEP(sec) is a MySQL built-in function that holds the execution of the current statement for sec seconds. For example:

SELECT SYSDATE(), SLEEP(2), SYSDATE();
  -- +---------------------+----------+---------------------+
  -- | SYSDATE()           | SLEEP(2) | SYSDATE()           |
  -- +---------------------+----------+---------------------+
  -- | 2023-12-16 23:46:02 |        0 | 2023-12-16 23:46:04 |
  -- +---------------------+----------+---------------------+

Reference information of the SLEEP() function:

SLEEP(sec): boolean
  Holds the execution for sec seconds and returns 0. Returns 1 if interrupted.

Arguments, return value and availability:
  sec: Required. The number of seconds to hold.
  boolean: Return value. 0 if and only if it holds to end.
  Available since MySQL 4.0.

⇒ UPDATEXML() - Updating Child Element in XML

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