Trigger function in MySQL

Trigger in MySQL. I am trying to create trigger in mysql  for every incoming data from remote device. Example i will receive data from remote device the Length and Width - value in integer datatype, therefore the trigger function will calculate the Area and Volume and update the row. I do manage to do this. The question is as follows : -

If no incoming data from remote device, i would like to trigger every 5 sec and calculate the Area and Volume with default value. If data come in from remote device then i have to reset the 5 sec from zero. As thought as a watch dog.
Rama TitoProgrammerAsked:
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lcohanDatabase AnalystCommented:
"If no incoming data from remote device, i would like to trigger every 5 sec and calculate the Area and Volume with default value."
If there is NO data change into the table where the trigger is this calculation would be a waste - right? I mean if nothing changes in that table the the area and volume would be the same as default data won't change. For scheduling events that can call a function for instance you could use

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Rama TitoProgrammerAuthor Commented:
Hi Expert,

In real situation, i am not calculation the area and volume. I am doing production monitoring which base on every seconds. Production Target compare with actual production will run simultaneously. Target = (current time - start time)/cycle time of production. Therefore every 5 sec i will update my database.
Rama TitoProgrammerAuthor Commented:
The links helped
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