我多久可以通过PHP查询MySQL数据库[关闭]

Question

I have a microcontroller which reads temperature from a sensor every second and serially sends it to a computer attached to it via USB. The computer has a LAMP server running on it. It takes the temperature measurements from the microcontroller and adds them to a MySQL server running on the computer. There is also a PHP file on the computer which is able to read the most recent temperature from the database and "echo" it. I have an Android app which queries the PHP file to get the temperature and update it on the screen.

Now, the question is: All of this process is happening on a local area network, so it's pretty fast. Would it be a good idea to "poll" the server every second if this was happening over the internet? How often should I ideally query the PHP file if I was doing this over the internet?

Answer 1

It just depends.

You can query your database as often as you can, however you may meet efficiency issue.You can just write a script which just query your database and set a clock to make that script just run for sometime (30 seconds for example). You count the total query, and output the count into file.

Use this method you can test the max qps of your database with that specific query.

Normally, you should reduce the frequency of every database query, cause the database query may be the bottleneck of your script speed.